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The problem, cause, and solution are the same as with outboard pad wear and they are mentioned again here so you do not have to find them in our previous blog posts. We will be discussing premature inboard pad wear this week.

Problem: 

One or more brake pads are wearing prematurely or irregularly

Cause: 

The cause of the pad wear will be based on what type of pad wear is taking place and the configuration of the brake system.

Solution:

Use the following charts to help diagnose the cause of the pad wear condition.

Premature wear of the inboard pad is caused when the inboard pad is not allowed to release off of the rotor properly after the brake pedal is released.

  • Floating/Sliding
    • Caliper housing seized on slide pins
    • Inboard pad binding in bracket due to corrosion
    • Inboard pad binding on slide rails due to corrosion or slide rail wear
    • Caliper piston not releasing properly
  • Fixed
    • Inboard piston(s) not releasing (mechanical)
    • Inboard pad binding on pins or in housing

Floating Caliper Causes

Caliper Housing Seized

Caliper Housing Seized on Slide Pins

Inboard Pad Binding

Inboard Pad Binding in Bracket due to Corrosion

Inboard Pad Binding 2

Inboard Pad Binding on Slide Rails due to Corrosion or Slide Rail Wear

Caliper piston not releasing properly

Caliper piston not releasing properly

Sliding Caliper Causes

Caliper housing seized corrosion

Caliper housing seized due to Corrosion of Caliper Hardware

Inboard pad binding in knuckle

Inboard pad binding in knuckle due to corrosion

Caliper piston

Caliper piston not releasing properly

Fixed Caliper Causes

Inboard piston not releasing

Inboard piston not releasing (mechanical)

Inboard pad binding on pins

Inboard pad binding on pins in Housing

Remember that seized slides or a sticking inboard brake pad should be checked before thinking about a sticking caliper piston.

We will continue diagnosing premature pad wear next week and will get into front to rear split hydraulic systems on both rear wheel drive and front wheel drive vehicles. We may even cover severe and mild accelerated wear and taper pad wear.

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