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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. We will be discussing Outboard Pad Wear.

Outboard Pad Wear

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

  • A. Floating caliper
    • Rusting of casting hole – reduces diameter
    • Corrosion of slide pin
    • Lack of lubrication
    • Incorrect lubrication
    • Caliper housing binding in knuckle (insufficient clearance)
    • Pad binding in bracket due to corrosion
    • Pad binding on slide rails due to corrosion or slide rail wear
  • B. Sliding caliper
    • Corrosion of sliding hardware
    • Incorrect lubrication
    • Corrosion of caliper housing/steering knuckle
  • C. Fixed caliper
    • Outboard piston(s) not releasing (mechanical)
    • Outboard pad binding on pins or in housing
7_1_both brake pads one side

Outboard Pad Wear

Floating Caliper Causes

Rusting of Caliper Housing Casting Hole

Rusting of Caliper Housing Casting Hole

Corrosion of Slide Pin

Corrosion of Slide Pin

 

 

 

 

 

 

 

Outboard Pad Binding in Bracket due to Corrosion

Outboard Pad Binding in Bracket due to Corrosion

Outboard Pad Binding on Slide due to Corrosion or Wear of Slide Rails

Outboard Pad Binding on Slide due to Corrosion or Wear of Slide Rails

 

 

 

 

 

 

 

Incorrect Lubrication

Incorrect Lubrication

Lack of Lubrication

Lack of Lubrication

 

 

 

 

 

 

 

Caliper Housing Binding

Caliper Housing Binding

 

 

 

 

 

 

 

Sliding Caliper Causes

Corrosion of Sliding Hardware

Corrosion of Sliding Hardware

Corrosion of Caliper housing:Steering Knuckle

Corrosion of Caliper housing:Steering Knuckle

 

Incorrect Lubrication on Metal to Rubber Parts

Incorrect Lubrication on Metal to Rubber Parts

Fixed Caliper Causes

Outboard Piston(s) not Releasing

Outboard Piston(s) not Releasing

Outboard Pad Binding on Pins or in Housing

Outboard Pad Binding on Pins or in Housing

 

 

 

 

 

 

 

Next week we will continue our post on pad wear and will be discussing Inboard Pad Wear.

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