Troubleshooting Guide - Haldex

Troubleshooting GuideDolly ABS Module System - Single AxleBrake Monitoring System (BMS)& Stand Alone System Components

Reference:Dolly ABS Module System Manual - L31267Brake Monitoring System Manual - L31250

TroubleshootingGuide

L31275W 8/12

IMPORTANT NOTICE

The data listed herein is correct to the best of Haldex’s knowledge and belief, having beencompiled from reliable and official sources of information. However, HALDEX CAN NOTASSUME ANY RESPONSIBILITY for possible error or misapplication of the product. Finaldetermination of the suitability of the products for the use contemplated by the Buyer is thesole responsibility of the Buyer. Haldex shall have no responsibility in connection with thissuitability.

IMPORTANT NOTICE

The description and specifications contained in this Troubleshooting Guide are current at thetime of printing. Haldex Brake Products Corp. reserves the rights to discontinue or modifymodels and/or procedures and to change specifications at any time without notice.

All Rights ReservedMaterial may only be reproduced with the written permission

of Haldex Brake Products Corporation

Information Notice

Page 1 www.haldex.com

WARNING: Haldex strongly recommends routine visual checks be performed at eachmaintenance service interval. Visually check the Dolly ABS Module System and Stand AloneComponents for Panel or Bracket Clamp Cracks, Loose Nuts, Fittings, Tubing Wear, etc.

IMPORTANT NOTICE

This Troubleshooting Guide for the Haldex Dolly ABS Module System (DMS)or Stand Alone Dolly System contains general information based on typical problems thatcould effect the function of the Haldex Dolly ABS Module System (DMS) or Stand Alone Dolly System.

The information contained in this installation manual was current at the time of printing and is subject to change without notice or liability.

Safety First !

You must follow your Company Safety Procedures when installing this equipment. Be sureyou understand all procedures and instructions before you begin.

Table of Contents

Section Page

Information Notice ..........................................................................................................1Table of Contents.............................................................................................................2Quick Troubleshooting Guide .............................................................................3 - 10Dolly System Assembly - (Module System Only) .......................................11 - 12Dolly System Assembly - (Stand Alone System).........................................13 - 14Emergency Control Valve Assembly................................................................15 - 16Pilot Valve Assembly............................................................................................17 - 18Booster Valve Assembly .....................................................................................19 - 20Quick Release Valve Assembly ..........................................................................21- 22ABS Relay Valve Assembly.................................................................................23 - 24ABS Relay Valve Assembly with Check Valve .................................................25-26Push/Pull Valve Assembly - (Haldex)......................................................................27Push/Pull Valve Assembly - (Bendix or Sealco) ..................................................28Pressure Protection Valve - (Stand Alone System) .............................................29Pressure Protection Valve - (Module System Only)............................................30Pressure Protection Valve - (Module System Only) .....................................31-32

Notes:

Pages 15-32 shows the function of each component within a Module System or Stand AloneSystem. The arrows indicate the flow of air when Service or Emergency air is Applied orReleased.

1. Do Not apply more than 120 psi when testing or troubleshooting these components.

2. Always check for contamination in any components before testing or troubleshooting.

3. If you have any questions regarding this product or any other Innovative Products offered by Haldex, please contact your local distributor for complete details. Technical Service or Troubleshooting help can be obtained by callingHaldex and asking for the ABS Technical Support Line at (800) 643-2374 Press “2”.

www.haldex.com Page 2

Troubleshooting Guide

www.haldex.comPage 3

Haldex - Dolly Operational Air System Tests

Required Fixtures for Testing:

Red (In) Gladhand Fixture No. 1 with Shut-Off Valve and Pressure Gauge (0-150 psi).

Blue (In) Gladhand Fixture No. 2 with Shut-Off Valve and Pressure Gauge (0-150 psi).

Blue (Out) Gladhand Fixture No. 3 with 50 cu. in. Air Reservoir and Pressure Gauge.

Red (In) Gladhandfrom Lead Trailer

Pressure Gauge

Pressure Gauge

Blue (In) Gladhandfrom Lead Trailer

Ball Valve

Ball Valve

Shop AirRegulated 90 - 110 PSI

Shop AirRegulated 90 - 110 PSI

Red (In) Gladhand Fixture - No. 1

Blue (In) Gladhand Fixture - No. 2

Blue or Red (Out) Gladhand Fixture - No. 3

Pressure Gauge

50 cu. in volume tank

Page 4www.haldex.com


Gladhand Attachment Points:

1.) Attach Red (In) Gladhand Fixture No. 1 to the Red Gladhand from the Lead Trailer.

2.) Attach Blue (In) Gladhand Fixture No. 2 to the Blue Gladhand from the Lead Trailer.

3.) Attach Blue (Out) Gladhand Fixture No. 3 to the Blue Gladhand to the Pup Trailer.

Emergency (Supply) Charging Test:

This test verifies proper operation of Pressure Protection with One-Way Check Valve and Air Suspension function.

* Test Fixture No. 1 is required for this test.

1.) Seal the Dolly Red (Out) Gladhand to the Pup Trailer.

2.) Attach shop air to the Red (In) Gladhand Fixture No. 1 with the Ball Valve Closed.

3.) Open the Ball Valve on Red (In) Gladhand Fixture No. 1.

Test Results:

- The Dolly Air Tank should fill and the Dolly Service Brakes should be Released.

- If equipped with Air Suspension, the Air Bags should inflate.

Troubleshooting:

- If the Air Tank Does Not fill, check the following:

• Check Pressure Protection with One-Way Check Valve for proper operation.

- If the Air Suspension Does Not inflate the Air Bags with a charged tank of 120 psicheck the following:

• Check the Suspension Pressure Protection Valve, Suspension Dump Valve andHeight Control Valve for proper operation.



Emergency (Supply) Release Test:

This test verifies proper operation of Pressure Protection with One-Way CheckValve, Emergency Control Valve and ABS Relay Valve

4.) If starting with this test repeat steps 1 - 3 of the Emergency (Supply) Charging Test, pg 4.

5.) Close the Ball Valve on Red (In) Gladhand Fixture No. 1.

6.) Remove the Shop Air from Red (In) Gladhand Fixture No. 1.

7.) Open the Ball Valve on Red (In) Gladhand Fixture No. 1 to vent.

Test Results:

- Dolly Service Brakes should Apply and remain Applied (Parked).

- Reservoir air should not exhaust out the Emergency (In) Gladhand.

- If equipped with Air Suspension, the Air Bags should deflate.

Troubleshooting:

- If the Service Brakes Do Not Apply, check the following:

• Plumbing (correct routing, restricted or damaged tubing, etc.)

• Check the Push/Pull (Hostler) Valve for proper operation.

• Check the Emergency Control Valve for proper operation.

• Check the ABS Relay Valve for proper operation.

- If Reservoir Air does exhaust out the Emergency (In) Gladhand. Replace thePressure Protection Valve with One-Way Check Valve and Retest.

- If the Air Suspension Does Not deflate check the following:

• Check the Suspension Dump Valve for proper operation.



Emergency (Supply) Line Closing Pressure Test:

This test verifies proper operation of Pressure Protection with One-Way CheckValve closing pressure.

* Test Fixture No. 1 is required for this test:

1.) Close the Dolly Red (Out) Shut Off Valve to the Pup Trailer.

2.) Attach Shop Air to the Red (In) Gladhand Fixture No. 1 with the Ball Valve Closed.

3.) Open the Ball Valve on the Red (In) Gladhand Fixture No. 1.

4.) When the Dolly Air Tank is fully charged to Shop Air pressure, close the Ball Valveon the Red (In) Gladhand Fixture No. 1.

5.) Drain the Dolly Air Tank by opening the Tank Drain Valve.

Test Results:

- The Pressure on the Red (In) Gladhand Fixture No. 1 Gauge should hold at 45 psi orhigher.

Troubleshooting:

- If the Air Pressure Does Not hold, check the following:

• Air leaks at gladhands, fittings, etc. If no air leaks are detected. Replace Pressure Protection with One-Way Check Valve feeding the Air Tank and Retest.



Dolly Service Brake Application Test:

This test verifies proper operation of Booster Valve and ABS Relay Valve.

* Test Fixtures No. 1, 2 & 3 are required for this test.

1.) Attach shop air and charge the Red (In) Gladhand Fixture No. 1 with shop air.

2.) The Dolly Brakes should be Released.

3.) Open the Ball Valve on the Blue (In) Gladhand Fixture No. 2.

4.) Charge the Blue (In) Gladhand Figure No. 2 with shop air.

Test Results:

- The Pressure in Test Fixture No. 3 should go from 0 psi to shop air pressure in 2 seconds or less.

- The Dolly Service Brakes Should Apply.

Troubleshooting:

- If Dolly Service Brakes Do Not Apply, check the following:


• Verify Service Air from the Booster Valve Delivery is flowing to the Blue (Out) Gladhand Fixture No. 3. If this is okay see next step below.

• Check the Emergency Control Valve and ABS Relay Valve for proper operation.



Dolly Service Brake Release Test:

This test verifies proper operation of the Booster Valve and ABS Relay Valve.

5.) If starting with this test repeat steps 1 - 4 of the Dolly Service Brake Application Test, pg 7.

6.) Close the Ball Valve on the Blue (In) Gladhand Fixture No. 2.

7.) Remove shop air from the Blue (In) Gladhand Fixture No. 2 to vent.

Test Results:

- Dolly Service Brakes should be Released.

Troubleshooting:

- If Dolly Service Brakes Do Not Release, check the following:


• Foundation Brakes binding or not releasing completely.

• Booster Valve or ABS Relay Valve not releasing air completely.

Service Air to Dolly During Failed Air Tank Pressure:

This test verifies proper operation of the One-Way Check Valve feeding the Booster Valve

* Test Fixture No. 1, 2 & 3 are required for this test:

- Red (In) Gladhand Fixture No. 1 Ball Valve Open, shop air removed.

- Blue (In) Gladhand Fixture No. 2 Ball Valve Open, shop air removed.

- Drain the Dolly Air Tank to 0 psi and leave the Tank Drain Valve open.

- Apply Shop Air to the Blue (In) Gladhand Fixture No. 2 while observing the Blue (Out) Gladhand Fixture No. 3 Pressure.

Test Results:

- Blue (Out) Fixture No. 3 Pressure should be the same as the Blue (In) Fixture No. 2 Pressure.

- No air should be venting from the open Dolly Air Tank Drain Valve.

Troubleshooting:

Replace One-Way Check Valve feeding the Booster Valve if the Dolly Air Tank is venting air during this test.




Notes

Rear Facing

Dolly ABS Module System


Recommended mountinglocation before or after FifthWheel assembly.

Air Reservoir mounting depends on the Dolly ABS Module System location.

Mount Dolly Air Brake System Moduleas shown

Technical Information: Dolly ABS Module System - Single Axle (DMS-SA)

C-Channel Dimension: Approx: Height 5-1/4” x Width 3”Approx: Height 7-3/4” x Width 3”

Recommend Tubing Sizes:

Service/Control (In): 3/8” Tubing (Blue)Service/Control (Out): 1/2” Tubing (Blue)Emergency/Supply (In): 1/2” Tubing (Red)Emergency/Supply (Out): 1/2” Tubing (Red)

Push/Pull Valve: Supply Line - 3/8” Tubing (Red)Reservoir Line - 3/8” Tubing (Blue)Delivery Line - 3/8” Tubing (Black)

Air Tank: Supply Line - 5/8” Tubing (Black)

Air Bags: Supply Line - 3/8” Tubing (Red)

Leveling Valve: Supply Line - 3/8” Tubing (Green)Deliver Line - 3/8” Tubing (Black)

Pintle Hook Chamber: Delivery Line - 1/2” Tubing (Red)


Dolly ABS Module System Assembly

ABS Electronic Control Unit (ECU)

Emergency Control Valve

Brake Monitoring System

Manifold

Quick Release Valve

Booster Valve

Pilot Valve(Suspension Dump)

2-Port ABS Relay Valve

One-WayCheck Valve

Pressure Protection Valve (PPV)

(Supply to HeightControl Valve)


with One-WayCheck Valve

One Way Check

Dolly ABS (Stand Alone) System


Technical Information: Dolly (Stand Alone) System

Recommend Tubing Sizes:

Service/Control (In): 3/8” Tubing (Blue)Service/Control (Out): 1/2” Tubing (Blue)Emergency/Supply (In): 1/2” Tubing (Red)Emergency/Supply (Out): 1/2” Tubing (Red)

Push/Pull Valve: Supply Line - 3/8” Tubing (Red)Reservoir Line - 3/8” Tubing (Blue)Delivery Line - 3/8” Tubing (Black)

Air Tank: Supply Line - 5/8” Tubing (Black)

Air Bags: Supply Line - 3/8” Tubing (Red)

Leveling Valve: Supply Line - 3/8” Tubing (Green)Deliver Line - 3/8” Tubing (Black)

Pintle Hook Chamber: Delivery Line - 1/2” Tubing (Red)


Dolly ABS System (Stand Alone Components)

Top View

Electronic Control Unit (ECU)

Emergency Control Valve

Quick Release ValveBooster Valve

2-Port ABS Relay Valve

One-WayCheck Valve

One-WayCheck Valve

Brake MonitoringSystem (BMS-1)

Pressure Protection Valvewith One-Way Check

Push/PullValve

Blue (Out) Red (In)

Blue (In) Red (Out)

One-Way Check Valve

Pintle Hook Chamber

Air Chamber (2)

Emergency Control Valve Assembly

Front View Side View

Mounting Holes(2 Places 5/16”)

90° Fitting(3/8” NPT X 3/8” Tubing)

(3 Places)

One-Way Check Valve

Straight Fitting(3/8” NPT X 3/8” Tubing)

Parker - Composite Fittings:

Supply Port - 3/8” NPT - (369PTC-6-6)Control Port - 3/8” NPT - (369PTC-6-6)Reservoir Port - 3/8” NPT - (369PTC-6-6)Delivery Port - 3/8” NPT - (68PMT-6-6)

Note: This valve is used on axles with Service Brake Chambers only. It is commonly used on dollies, trailer turntables and other axles exempt from Spring Brake requirements.

Control Port

Supply Port

Delivery Port

Reservoir Port

Side View


Emergency Control Valve Function


Piston moves up

Emergency Air Applied:

1.) Emergency (In) air is Applied and piston (inside) moves up releasing the Parking Brakes.

2.) One-Way Check Valve closes off Supply Pressure from Reservoir Pressure.3.) Service (In) air is Applied and Released for Service Brake application.

2

1

Piston moves down

Emergency Air Released:1.) Emergency (In) air is released and piston (inside) moves down, Service brakes

applied (Parked).2.) One-Way Check Valve allows reservoir air to flow to delivery port of Emergency

Control Valve.3.) Reservoir air is applied to the Delivery Port feeding the Control Port of ABS

Relay Valve (Parked Service Brakes Applied).

2

3

3

3

1

Supply Port

Delivery Port

Reservoir Port

Control Port

Supply Port

Delivery Port

Reservoir Port

Control Port

NOTE: If brakes DO NOT released or apply seeBooster Valve and ABS Relay Valve Function.

Pilot Valve Assembly(Suspension Dump)

Mounting Holes(4 Places 1/4”)

Exhaust Port90° Fitting

(3/8” NPT X 3/8” Tubing)(3 Places)

Tee Fitting(1/8” NPT X 1/4” Tubing)

N.O. Port(Exhaust)

Pilot Port(Supply/Emergency Port)

SUS. Port(Air Bags)

N.C. Port(Leveling Valve)


Pilot Port - 1/8” NPT - (372PTC-4-2)N.O. Port - 1/4” NPT - (369PTC-6-4)N.C. Port - 1/4” NPT - (369PTC-6-4)SUS. Port -1/4” NPT - (369PTC-6-4)


Note:

The 3-Way Pilot (Suspension Dump) Valve is used on a trailer suspension systems to deflate the air bags, when the vehicle is parked.

Pilot Valve Function(Suspension Dump)

Air Bags Inflating:

1.) Emergency (In) air is Applied to pilot port and piston (inside) moves down.2.) Delivery air from the Height Control Valve port opens.3.) Air will flow through valve, inflating the air bags.

Air Bags Deflating:

1.) Emergency (In) air is Released from pilot port and piston (inside) moves up.2.) Delivery air from the Height Control Valve is closed off.3.) Air bags deflate through exhaust.

1

2

3

Piston

Delivery Air

Air Bag Air Bag

4

1

2

3

Piston

Delivery Air

Air Bag Air BagExhaust

4


Height Control Valve (Open)

Height Control Valve (Closed)

UP

Booster (FAB) ValveAssembly


1/2” NPT X 1/2” Tube Straight - (68PMT-8-8)1/2” NPT X 1/2” Tube 90 Deg - (68PTC-8-8)1/2” NPT X 3/8” Tube 90 Deg - (68PTC-6-8)3/8” NPT X 3/8” Tube Straight - (68PMT-6-6)

Page 19

Top View

Front View

Side View

3/8” NPT X 3/8” Tube - Straight

1/2” NPT X 3/8” Tube - 90°

1/2” NPT X 1/2” Tube - 90°


1/2” NPTOne-Way Check Valve

Mounting Holes (2 Places) 5/16”

Note:

Booster Valves are used to speed upApply and Release Timing to ServiceBrake Valves.

www.haldex.com

Booster (FAB) Valve Function


1

2

Air Applied:

1.) Emergency (In) air Applied to chargethe air reservoir.

2.) Service (In) air Applied to the BoosterValve and piston (inside) moves down.

3.) The Booster Valve flows reservoir airto the Delivery Ports of the Valve.

4.) Service brakes should Apply.

Air Released:

1.) Emergency (In) air Applied to charge the air reservoir.

2.) Service (In) is Released from the BoosterValve and piston (inside) moves up.

3.) The Booster Valve closes off reservoirair from the Delivery Ports of the BoosterValve.

4.) Service brakes should Release completelywithout any trapped air or dragging brakes.

NOTE: If brakes DO NOT release completelysee ABS Relay Valve Function

Red (In)

Blue (In)

4

ABS Relay Valve

Booster Valve 3

Quick Release Valve Assembly


Front View


1/2” NPT X 1/2” Tube 90º - (369PTC-8-8)3/8” NPT X 1/2” Tube 90º - (369PTC-8-6)1/2” NPT Male Branch Tee (2224P-8)

Side View

Delivery Port

Exhaust Port

Mounting Holes (2 Places) 5/16”

1/2” NPT X 1/2 Tube 90º

3/8” NPT X 1/2 Tube 90°

Male Branch Tee (1/2” NPT X 1/2” NPT)

3/8” NPT X 1/2 Tube 90°Delivery Port

Inlet Port

1/2” NPT X 1/2 Tube 90ºInlet Port


Quick Release Valve Function

Air Applied:

1.) Emergency (In) air Applied to charge the air reservoir.

2.) Emergency (Out) air will flow through theQuick Release Valve.

1

Diaphragm moves down sealing off exhaust port

Air Released:

1.) Emergency (In) air Released and system vents.

2.) Emergency (Out) air will vent through theQuick Release Valve Exhaust Port.

NOTE: If valve DOES NOT exhaust whenair is released, replace valve.

1

Diaphragm moves upopens exhaust port

Exhaust

2

2

ABS Relay ValveAssembly

Page 23


3/8” NPT X 3/8” Tube 90º - (369PTC-6-6)3/8” NPT X 1/4” Tube 90º - (369PTC-4-6)3/8” NPT Run Tee (2225P-6)

Front View Top View

Side View

Control PortDelivery Ports

Reservoir PortSolenoid

Exhaust Port

3/8” NPT Run Tee (2)

3/8” NPT X 1/4 Tube 90° (2)

3/8” NPT X 3/8 Tube 90°

Tee & Fittings

1/2” NPT X 5/8” Tube 90°

1/2” NPT X 1/2 Tube 90°

Tee - 1/2” NPT

www.haldex.com


ABS Relay ValveFunction

1

2

3

Brakes are applied:

* Apply Emergency (In) to charge the reservoir1.) Service (In) air is Applied to the ABS Relay

Valve and piston (inside) moves down.2.) The ABS Relay Valve flows reservoir air

to the Delivery Ports of the ABS Relay Valve.3.) Service brakes should Apply.

Piston moves down

1

2

3

Brakes are Released:

1.) Service (In) air is Released from the ABS RelayValve and piston (inside) moves up.

2.) The ABS Relay Valve closes off reservoir airfrom the Delivery Ports of the Valve.

3.) Service brakes should Release completely.

NOTE: If brakes DO NOT release completely seeBooster Valve Function.

Piston moves up

Air Chambers exhaustthru ABS Relay Valve

Air Leaking out of ABSRelay Valve Exhaust Port


Step 1: Apply Emergency (In) to charge the reservoir.

ABS Relay Valve

One-Way Check Valve

Leakage could be within the ABS Valve or One-Way Check Valve

ABS Relay Valve

One-Way Check Valve

Step 2: If air is leaking out of the ABS Relay Valve exhaust port, go to Step 3.

ABS Relay Valve

One-Way Check Valve

Step 3: Remove air line from the delivery port of the ABS Relay Valve. If air is leaking out ofthe ABS Relay Valve exhaust port. Replace ABS Relay Valve and retest.

Delivery Port


Air Leaking out of ABSRelay Valve Exhaust Port

Step 4. If air is leaking out of the open line from the One-Way Check Valve. Replace One-Way Check Valve and retest.

ABS Relay Valve

One-Way Check Valve

Page 27

Delivery PortReservoir Port

Push/Pull Valve Function

Supply Port

Air Applied:

1.) Emergency (In) air is Applied.Push/Pull Valve knob pops out.

2.) Parking brakes are released.

NOTE: If Push/Pull Valve knob does not popout, check Emergency (In) air pressureis greater than 100 PSI.

Air Released:

1.) Emergency (In) air is Released.Push/Pull Valve knob remainsin the popped out position.

2.) Parking brakes are Applied.

Push/Pull Valve Function: (Dolly is Parked)

1.) Push the knob (In) to Release Parking brakes.2.) Pull the knob (Out) to Apply Parking brakes.

Note: This manual function will cycle until reservoir air is depleted.

Note: If Parking brakes do not Apply & Releasewith greater than 50 psi in the tank, checkEmergency Control Valve and ABS Relay Valve for proper function.

1 2

1 2

Haldex Push/Pull Valve

www.haldex.com


Push/Pull Valve Function

Reservoir PortDelivery Port

Supply Port12

12

Bendix® or Sealco Push/Pull Valve

Air Released:

1.) Emergency (In) air is Released.Push/Pull Valve knob remainsin the popped out position.

2.) Parking brakes are Applied.

Air Applied:

1.) Emergency (In) air is applied.Push/Pull Valve knob pops out.

2.) Parking brakes are Released.

NOTE: If Push/Pull Valve knob does not popout, check Emergency (In) air pressureis greater than 100 PSI.

Push/Pull Valve Function: (Dolly is Parked)

1.) Push the knob (In) to Release Parking brakes.2.) Pull the knob (Out) to Apply Parking brakes.

Note: This manual function will cycle until reservoir air is depleted.

Note: If Parking brakes do not Apply & Releasewith greater than 50 psi in the tank, checkEmergency Control Valve and ABS Relay Valve for proper function.

Page 29

Pressure Protection Valve(Stand Alone System)

www.haldex.com

Emergency (In) Air Applied :

Apply Emergency (In) air pressure. Once Pressure Protection Valve opens air will charge the reservoir.

Note: Shop or Tractor pressure must be greater than 80 psi to open Pressure Protection Valve.

Pressure Protectionwith One-Way Check Valve

Emergency (In) Air Released:

The Pressure Protection will close and the One-Way Check Valve will seal off tank air frombleeding out the open Red Gladhand.

Note: If the tank air drains down after releasing Emergency (In) pressure, replace Pressure Protection with One-Way Check Valve.

Emergency (In)

Pressure Protectionwith One-Way Check

Valve seals at this point

Emergency (In)


Pressure Protection Valve(Brake Module Only)

Delivery AirHeight Control Valve (Open)

UP

Suspension PressureProtection Valve

From Reservoir

Control Port

Emergency (In) Applied:

Emergency (In) air applied to charge the reservoir. When reservoir pressure builds to 75psi or greater, the Suspension Pressure Protection Valve will open. Air will flow throughthe Height Control Valve, inflating the Air Suspension System.

Manifold Assembly(Brake Module Only)

Material: AluminumMounting Screws: 1/4-20 X 3/4” Socket Head Cap Screw (3)


3/8” NPT X 1/2” Tube 90° - (369PTC-8-6)3/8” NPT X 1/2” Tube Straight - (68PMT-8-6)3/8” NPT X 3/8” Tube 90° - (369PTC-6-6)3/8” NPT X 3/8” Tube Straight - (68PMT-6-6)3/8” NPT X 1/4” Tube 90° - (369PTC-4-6)1/4” NPT X 3/8” Tube 90° - (369PTC-6-4)3/8” NPT X 1/4” Male Reducer - (3/8 x 1/4FF-S Vibraseal)3/8” NPT - Pipe Plug - (1/2HHP-S Vibraseal)


3/8” NPT X 1/4” Tube - 90°


One-Way Check


3/8” NPT X 1/4” Tube - 90°3/8” NPT X 3/8” Tube - 90°

Pressure Protection Valve (70 psi)

Pressure Protection Valve (75 psi)

with One-Way Check

Top View

Manifold

1/8” NPT X 3/8” Tube - 90°

3/8” NPT X 1/2” Tube - 90°

3/8” NPT X 1/4” Reducer

(Steel Nipple)

1/2” NPT Pipe Plug


(Supply to HeightControl Valve)

Pressure Protection with One-WayCheck Valve


One-Way Check


Pressure Protectionwith One-Way Check Valve

To Reservoir

Pressure Protection Valve with One-Way Check(Brake Module Only)

Charge System Air :

Charge the system thru Red (In) Gladhand. Air will flow thru the Pressure Protectionwith One-Way Check Valve. The reservoir air will not bleed back because of theOne-Way Check Valve.

Pressure Protection with One-Way Check Valve

Remove Red (In) Gladhand:

When the Red (In) Gladhand pressure is removed, the system will only vent air from the endof the Pressure Protection Valve. If air continues to bleed out of the Pressure Protection withOne-Way Check Valve, then the One-Way Check Valve is deflective, replace with new PressureProtection with One-Way Check Valve and Retest.

To Reservoir

L31275W US 8/12 WEB ONLY

Commercial Vehicle Systems

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Haldex is listed on the Stockholm StockExchange. Haldex has a yearly turnover ofclose to 5.6 billion SEK and employs 4,300people.

Disclaimer: The products described within this literature, including without limitation,product features, specifications, designs,availability and pricing are subject tochange by Haldex and its subsidiaries at anytime without notice.

This document and other information fromHaldex, its subsidiaries and authorizeddistributors provide product and/or systemoptions for further investigation by usershaving technical expertise. It is importantthat you analyze all aspects of yourapplication and review the informationconcerning the product or system, in thecurrent literature or catalog. Due to thevariety of operating conditions andapplications for these products or systems,the user, through their own analysis andtesting, is solely responsible for making thefinal selection of the products and systemsand assuring that all performance, safetyand warning requirements are met.

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United KingdomHaldex Ltd.Newton AycliffeTel.: +44 1325 310 110Fax: +44 1325 311 834E-Mail: [email protected]

Haldex Brake Products Ltd.RedditchTel.: +44 1527 499 499Fax: +44 1527 499 500E-Mail: [email protected]

USAHaldex Brake Products Corp.Kansas CityTel.: +1 816 891 2470Fax: +1 816 891 9447E-Mail: [email protected]

AustriaHaldex Wien Ges.m.b.H.ViennaTel.: +43 1 8 69 27 97Fax: +43 1 8 69 27 97 27E-Mail: [email protected]

BelgiumHaldex N.V.BalegemTel.: +32 9 363 90 00Fax: +32 9 363 90 09E-Mail: [email protected]

BrazilHaldex do Brasil Ind. e Com. Ltda.São PauloTel.: +55 11 213 55 000Fax: +55 11 503 49 515E-Mail: [email protected]

CanadaHaldex Ltd.Cambridge, OntarioTel.: +1 519 621 6722Fax: +1 519 621 3924E-Mail: [email protected]

ChinaHaldex International Trading Co. Ltd.ShanghaiTel.: +86 21 5240 0338Fax: +86 21 5240 0177E-Mail: [email protected]

FranceHaldex Europe SASWeyersheim (Strasbourg)Tel.: +33 3 88 68 22 00Fax: +33 3 88 68 22 09E-Mail: [email protected]

GermanyHaldex Brake Products GmbHHeidelbergTel.: +49 6 221 7030Fax: +49 6 221 703400E-Mail: [email protected]

HungaryHaldex Hungary Kft.SzentlörinckátaTel.: +36 29 631 300Fax: +36 29 631 301E-Mail: [email protected]

IndiaHaldex India LimitedNasikTel.: +91 253 2380094Fax: +91 253 2380729

ItalyHaldex Italia Srl.Biassono (Milan)Tel.: +39 039 47 17 02Fax: +39 039 27 54 309E-Mail: [email protected]

www.haldex.com

Date post:	18-Dec-2021
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Troubleshooting Guide - Haldex

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