Brake Problems

Tech Tips

Brake Problems

 

Tip #1
Low/Spongy Break Pedal
Pedal nearly touches floorboard before brakes function. No brake reserve.
Probable Cause: Corrective Action:
No fluid in master cylinder. Check system for fluid leak and repair.
Excessive free play in brake pedal linkage. Adjust for proper linkage.
Pad "knock-back". Examine rotor run out and parallelism, bearing adjustment, etc.
Excessive clearance between linings and drums. Adjust brakes.
Contaminated fluid. Replace with approved brake fluid.
Residual line pressure valve faulty. Check/replace.
Air in hydraulic system. Bleed brake system.

Tip #2
High Pedal Force
Excessive stopping distance, excessive pedal effort, brakes do not react properly.
Probable Cause: Corrective Action:
Worn/glazed pads or linings. Replace with new pads or linings.
Frozen calipers or wheel cylinders. Free up and replace if necessary.
Brake booster failure. Inspect booster Assy. Repair as required.

Tip #3
Brake Drag
Sticking brakes may be failing to release properly.
Probable Cause: Corrective Action:
Brakes adjusted too tight. Readjust and allow sufficient clearance between lining and drum.
Master cylinder by-pass port blocked. Clear blockage.
Weak pedal return spring. Install new springs.
Distorted backing plates. Replace with new plates.
Sticky wheel cylinder. Repair with new cups.

Tip #4
Brake Pull
Car pulls to one side when brakes are applied.
Probable Cause: Corrective Action:
Contamination of pads or linings with
brake fluid, oil, grease, etc.		 Clean or replace pads or linings.
Unmatched pads or linings. Replace with correct parts.
Faulty caliper pad alignment. Check for loose caliper mounting bolts, guide pins, broken clips.
Unequal brake adjustment. Readjust all brakes.
Seized Calliper. Overhaul both calipers (ie. pin and seal kits) on that axle.

Tip #5
Brake Grab
"Touchy" brakes that grab with least pressure.
Probable Cause: Corrective Action:
Contamination of pads or linings with
brake fluid, oil, grease, etc.		 Clean or replace pads or linings.
Caliper not aligned with disc. Correct alignment.
Mounting bolts loose. Tighten to specified torque.
Brake lines, hoses kinked, collapsed or clogged. Repair or replace.
Caliper pistons or slides seized. Free up and replace if damaged.

Tip #6
Brake Noise
Brakes should operate with minimal amount of noise.
However excessive squeal, screech, groaning, grinding chatter or rattle means your brakes need attention.
Probable Cause: Corrective Action:
Too much lateral run out of rotor. Correct runout to manufacturers spec.
Worn pads or linings. Replace with new pads or linings.
Twisted brake shoe. Replace brake shoes.
Weak or broken spring components. Replace with new springs.
Drums out of round. Turn or replace drums.
Loose wheel bearing. Adjust or replace faulty parts.
Foreign particles embedded in material. Replace with new pads or linings.
Faulty caliper alignment. Readjust.

Tip #7
Vibration
Brake pedal, steering wheel or entire wheel shakes, vibrates or pulsates when brake is applied.
Probable Cause: Corrective Action:
Rotor run out and parallelism. Resurface disc brake rotors.
Wear in steering and suspension components. Examine and replace worn components.
Wheels out of balance. Wheel balance required.

Tip #8
Brake Wear
Premature wear can be caused by a number of faults in the brake system.
To avoid costly repairs have the brakes checked at least once a year.
Probable Cause: Corrective Action:
Wrong type of pad or lining material for operating conditions. Replace with correct pad or lining material for application.
Caliper pistons and/or pins seized. Fit pin and seal kits.
Extremely rough rotor surface. Regrind rotors.

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  • Whatever the driving style, Bendix has the answer
     
    Driving style and type of vehicle greatly affect brake pad performance. The key to excellent braking is matching the driving  style and vehicle with the right brake pad formulation. You can select and fit the right Bendix brake pad for virtually every application with absolute confidence.