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Mechanic

Disc Brake Troubleshooter




Excessive Pedal Travel


1. Pads worn down - replace pads
2. Air leak or insufficient fluid in system or caliper.
3. Loose wheel bearing adjustment.
4. Damaged or worn caliper piston seal.

Brake Roughness or Chatter; Pedal Pumping


1. Wheel bearings incorrectly adjusted.
2. Discs worn or corroded/pitted
3. Faulty Brake pads or incorrect installment. 

Excessive Pedal Effort


1. Frozen or seized pistons.
2. Brake fluid, oil or grease on linings.
3. Pads 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 pads. 

Pull, Uneven or Grabbing Brakes


1. Frozen or seized pistons.
2. Brake fluid, oil or grease on linings.
3. Loose caliper attachment.
4. Un-equalized front tyre pressure.
5. Unmatched tyres on same axle.
6. Incorrect front end alignment.
7. Loose front end parts.
8. Faulty/incorrect pads
9. Restricted brake tubes or hoses.
10. Malfunctioning caliper assembly.
11. Inoperative combination valve.
12. Power brake unit malfunctioning.

Brake Rattle


1. Excessive clearance between pad and caliper.

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/or Pads 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.

Information courtesy of http://www.eotb.ca/

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