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Mechanic

Drum Brake Troubleshooter

Excessive Pedal Travel

1. Shoe and lining knock back after violent cornering or rough road travel.
2. Piston and shoe and lining assembly not properly seated or positioned.
3. Air leak or insufficient fluid in system or caliper.
4. Loose wheel bearing adjustment.
5. Damaged or worn caliper piston seal.
6. Improper booster push rod adjustment.
7. Shoe out of flat more than .005".
8. Rear brake automatic adjusters in-operative.
9. Improperly ground rear brake shoe and lining assemblies.

Brake Roughness or Chatter; Pedal Pumping


1. Excessive lateral run-out of rotor.
2. Rotor excessively out of parallel.
3. Wheel bearings incorrectly adjusted.
4. Rear drums out of round.
5. Brake pad reversed.

Excessive Pedal Effort


1. Frozen or seized pistons.
2. Brake fluid, oil or grease on linings.
3. Shoe and lining worn below specifications.
4. Proportioning valve malfunction.
5. Booster inoperative.
6. Leaking booster vacuum check valve.
7. Restricted, dented, kinked or collapsed brake lines or hoses.
8. Partial system failure.
9. Fading due to incorrect brake lining.

Pull, Uneven or Grabbing Brakes


1. Frozen or seized pistons.
2. Brake fluid, oil or grease on linings.
3. Caliper out of alignment with rotor.
4. Loose caliper attachment.
5. Un-equalized front tyre pressure.
6. Unmatched tyres on same axle.
7. Incorrect front end alignment.
8. Loose front end parts.
9. Lining protruding beyond end of shoe.
10. Restricted brake tubes or hoses.
11. Malfunctioning caliper assembly.
12. Inoperative combination valve.
13. Power brake unit malfunctioning.

Brake Rattle


1. Excessive clearance between shoe and caliper or between shoe and splash shield. 
2. Shoe hold-down clips missing or improperly positioned.

Heavy Brake Drag


1. Frozen or seized pistons.
2. Operator riding brake pedal.
3. Incomplete brake pedal return due to linkage interference.
4. Faulty booster check valve holding pressure in hydraulic system.
5. Residual pressure in front brake hydraulic system.
6. Stuck master cylinder piston.
7. Restricted brake lines or hoses.
8. Incorrect parking brake adjustment.
9. Check valve in lines to front wheels.

Caliper Brake Fluid Leak


1. Damaged or worn caliper piston seal.
2. Scores in cylinder bore.
3. Corrosion build-up in cylinder bore or on piston surface.
4. Metal clip in seal groove. 

No Braking Effect When Pedal is Depressed


1. Piston and shoe and lining assembly not properly seated or positioned.
2. Air leak or insufficient fluid in system or caliper.
3. Damaged or worn caliper piston seal.
4. Bleeder screw open.
5. Air in hydraulic system or improper bleeding.
6. Hydraulic leaks.
7. Master cylinder primary cup worn or damaged.
8. Master cylinder bore corroded, worn or scored.



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