Drum BrakesDrum Brakes

Two different categories Two different categories of drum brakesof drum brakes

Non-servoNon-servo ServoServo

Non-ServoNon-Servo On Front Wheel Drive (FWD) On Front Wheel Drive (FWD)

vehicles it is necessary to have a vehicles it is necessary to have a more more iineffectiveneffective brake on the brake on the rear of the car.rear of the car.

Non-ServoNon-Servo

Servo ActionServo Action

The rear The rear shoe does shoe does mostmost of the of the workwork

Wedging Wedging actionaction

Non Servo brake Non Servo brake lininglining

Servo Brake Servo Brake lininglining• Primary Primary • SecondarySecondary

It is very important that It is very important that the Primary shoe is always the Primary shoe is always facing toward the front of facing toward the front of

the carthe car

The Secondary shoes The Secondary shoes always face toward the always face toward the

rear of the carrear of the car

Drum RemovalDrum Removal Groves from Groves from

the rivets the rivets wearing into wearing into the drum.the drum.

The last brake The last brake job...the drums job...the drums weren’t turnedweren’t turned

Drum RemovalDrum Removal

Drum RemovalDrum Removal

Things To Look ForThings To Look For

Worn DrumsWorn Drums

ScoredScored Bell Bell

MouthedMouthed ConcavedConcaved

Max. Drum sizeMax. Drum size

Why is this Why is this importantimportant

Check the Wheel Cylinders for Check the Wheel Cylinders for leaksleaks

AdjustersAdjusters

Check them for Check them for wear wear

FrozenFrozen

Axle SealsAxle Seals

Inside LeakInside Leak Outside LeakOutside Leak