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Typical damage patterns and their causes of brake discs and brake pads

Table of Contents
Brake-Pad-Replacement

High-Quality brakes are more than safe

It is incorrect to choose the wrong or not high-quality brake parts, we must obey the specifications of the vehicle or brake manufacturer. The person must perform by skilled and trained

When we need to install newest brake components, please follow the below:  

  • Always replace both of brake pads with brake discs

  • Always replace all brake discs and pads per axle

  • Be careful to install brake discs and pads the correct way

  • Avoid unnecessary heavy braking on the first 200 kilometers

  • Way be the Brake performance will lower on the first 200 driven kilometers

Check all functional reliability after installation:  

  • Pump the brake pedal until it becomes stiff

  • Pedal travel must not vary at constant pedal load after the pedal has been depressed several times

  • Check the wheels if can free rotation

  • If required, brake fluid level in the expansion tank and top up

Overheating of the mating friction surfaces

Overheating of the mating friction surfaces

The problem:  

The brake pad can not disengage and rubs against the disc. It will cause the brake system to overheat

Reason:

  • Brake pad difference seized

  • The brake piston stuck in the caliper

  • Driving with a depressed brake pedal

Results:  

  • Brake performance will be reduced

  • Abnormal noise

  • Brake wobble and brake judder, because the brake disc deformation

  • Finally, the brake disc friction surface may peel off

Score and groove marks on brake discs

Score and groove marks on brake discs

The problem:  

Score and groove marks on disc brakes

Reason:  

  • Foreign body between brake disc and pad

  • Corrosion

  • Overly soft brake discs

  • Low-quality brake pad material

  • Brake system pressure is over

Results:  

  • Reduced braking power

  • Abnormal noise

Corrosion

Corrosion

The problem:

Brake discs and pads get rusty is series

Reason:

  • Climatic effects (e.g. road salt, moisture)

  • The parking brake engaged is over the downtime

  • The brake piston stuck in the caliper

  • The brake piston not fully returned to the retracted place

Results:  

  • Vibration and brake judder caused by brake disc deposits

  • Noise

  • Limited braking power

  • Overheating of brake discs and pads caused by rust spots

Asymmetrical wear of brake disc front and rear sides

Asymmetrical wear of brake disc front and rear sides

The problem:  

The brake pad is pressed unevenly against the brake disc.

Reason:

  • Brake pad seized

  • Problems during installing

  • Anti-squeal shims out of place

  • The brake caliper is positioned not correctly

Results:  

  • Asymmetrical wear of brake disc front and rear sides

  • Limitedbraking power

  • Pulsing brake pedal/judder

  • Shaking steering wheel

  • Possible noise

  • Wear limit reached prematurely

Contaminated mounting face, pressure marks, and corrosion

Contaminated mounting face, pressure marks and corrosion

The problem:  

Plane-parallel installation is not or not fully possible

Reason:

  • Can not clean wheel hub mounting face correctly

  • Dirt or rust particles trapped between brake disc and hub

  • Grease/paste from foreign body trapped between the brake disc and wheel hub

Results:  

  • Asymmetrical wear

  • Pulsing brake pedal/judder

  • Shaking steering wheel

  • Reduced braking power

  • Wear limit reached prematurely

Mounting face cracked around bores

Mounting face cracked around bores

The problem:

Formation of cracks in area surrounding wheel bolt holes

Reason:

  • Excessive torque to tighten wheel nuts and bolts

  • Failure to tighten wheel nuts and bolts in correct process

  • Lack of plane-parallel alignment between the wheel hub and brake disc result

  • The brake disc shakes immediately after installation

  • Mounting face deformation

  • Brake disc cracks overload

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