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We are continuing our discussion on premature pad wear. This week we will be discussing pad wear on rear wheel drive and front wheel drive vehicles. Here is a link to our post from last week on premature inboard pad wear.

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.

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.

Solution:

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

  • Front to Rear Split Hydraulic System

    • Piston sticking (symptom – drag)
    • Brake hose on side with problem with check valve condition (symptom – drag)
    • Brake hose opposite side with problem restricted (symptom – pull to side with pad wear)
    • Hydraulic restriction higher than brake hose on side with pad wear not allowing release of pressure (i.e. ABS modulator)

Images for Front to Rear Split Hydraulic Systems (RWD)

9_both_sticking piston_rgb

Piston Sticking (symptom – drag)

9_both_check valve hose_rgb

Brake Hose on Side with Problem with Check Valve Condition (symptom – drag)

9_both_restricted hose_rgb

Brake Hose Opposite Side with Problem Restricted (symptom – pull to side with pad wear)

9_both_abs modulator_rgb

Hydraulic Restriction Higher than Brake Hose on side with Pad Wear not Allowing Release of Pressure (i.e. ABS modulator)

  • Diagonal Split Hydraulic System (All items listed above for Front to Rear Split Hydraulic Systems plus the images below)

    • Piston sticking (symptom – drag)
    • Brake hose on side with problem with check valve condition (symptom – drag)
    • Brake hose opposite side with problem restricted (symptom – pull to side with pad wear)
    • Hydraulic restriction higher than brake hose on side with pad wear not allowing release of pressure (i.e. ABS modulator)
    • Air in opposite hydraulic circuit than side with wear

Images of Diagonal Split Hydraulic Systems (FWD)

9_both_airmc_rgb

Air in Opposite Hydraulic Circuit than Side with Wear (i.e. LF inner and outer pads worn, air in RF/LR circuit)

9_both_vent_rgb

Vent Port Plugged or Covered on Hydraulic Circuit with Pad Wear

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