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5/5/2005 MAE 442
Power Brake Booster
Team Needs An A
MAE 442 Final Presentation
5/5/2005 MAE 442 2
Brake Booster Assists the driver in
applying brake force by
amplifying the input
from the brake peddle.
Fourxdoctor.com
5/5/2005 MAE 442 3
Types of Brake Assist Hydro Power
Found on large trucks, mostly
diesels
Uses pressure from power
steering pump
Vacuum Assisted Found in SIE
Uses the engine vacuum to
assist
5/5/2005 MAE 442 4
Vacuum Booster Uses the vacuum from
the intake manifold or an additional pump
A valve allows atmospheric air to be let into the chamber
The vacuum pulls the diaphragm and pushes the primary piston
5/5/2005 MAE 442 5
Cut-Away of a Vacuum Booster
5/5/2005 MAE 442 6
Vacuum Booster Pros
Simpler operation
Works great with SIE
Cheaper system
More energy efficient
Does not decrease
engines Horsepower
Cons Large bulky
system
Must have
adequate vacuum
Can have leaks
5/5/2005 MAE 442 7
Hydro-Booster Uses the pressure from the power
steering pump
Activation of brake pedal increase
internal pressure
Booster output piston applies
pressure to the Master Cylinder
Nitrogen canister stores hydraulic
pressure to assist braking after
engine shuts down©bosch_usa
5/5/2005 MAE 442 8
Hydro Booster Pros
Better Power over
Vacuum
Long life span
Saves space
Less pedal travel and
greater braking force
Cons Can have leakage
High Stress on brake
lines
Expensive system
Must use power steering
or additional pump
5/5/2005 MAE 442 9
Basic Set up Schematic
©bosch_usa
5/5/2005 MAE 442 10
Typical Performance Curve Hydraulic boosters can
produce more than twice the force of a vacuum booster
Modern hydraulic boosters use a backup pump for safety
Hydro-max™ booster
5/5/2005 MAE 442 11
Our Hydro-Booster Display From Pump to
Boost(High Pressure)
From Boost to Pump
(Low Pressure Return)
From Boost to Steering System
(High Pressure)
5/5/2005 MAE 442 12
Pump
Hand Crank Pulley(used to turn pump) (usually connected to motor)
5/5/2005 MAE 442 13
Hydro Booster
Rod Pushes on
Master Cylinder
Connects to
Fire Wall Here Brake Pedal Pushes Rod
5/5/2005 MAE 442 14
Sources HydraTech Braking Systems
http://www.hydratechbraking.com Vanco Power Brake Supply
http://www.vancopbs.com HowStuffWorks.com
http://auto.howstuffworks.com Robert Bosch Corporation
http://www.boschusa.com SAE International
http://www.sae.org Fourxdoctor Off-Road Preparations
http://www.Fourxdoctor.com