Brake System Symptom Troubleshooting - Rapid brake pad wear, vehicle vibration (after a long drive), or high, hard brake pedal

NOTE:  Make sure that the caliper pins are installed correctly. The upper caliper pin and the lower caliper pin are different. If these caliper pins are installed in the wrong location, it will cause vibration, uneven or rapid brake pad wear, and possibly uneven tire wear. See the proper caliper pin location:

• Front caliper
• Rear caliper

1. Electric servo brake system check

   -1. Turn the vehicle to the ON mode.

   -2. Check the brake system indicator (red) and the brake system indicator (amber) for several seconds when the vehicle to the ON mode.

   Do the indicators come on then go off?

   YES 

   Go to step 2.

   NO 

   Go to electric servo brake system troubleshooting .

2. Electric parking brake system check

   -1. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

   -2. Check the brake system indicator (red) and the brake system indicator (amber) for several seconds when the vehicle to the ON mode.

   Does the indicator come on then go off?

   YES 

   Go to step 3.

   NO 

   Go to electric parking brake system troubleshooting .

3. Brake system check

   -1. Drive the vehicle to note if the brakes drag or the pedal becomes high and hard. This may take 20 or more brake pedal applications during an extended test-drive.

   -2. With the vehicle in the READY TO DRIVE mode, raise and support the vehicle , and spin all four wheels by hand.

   Is there brake drag at any of the wheels?

   YES 

   Go to step 4.

   NO 

   Look for other causes of pad wear, high pedal, or vehicle vibration.

4. Brake pedal position switch check

   -1. Without removing the brake lines, separate the brake pedal from the pedal feel simulator, then spin the wheels to check for brake drag.

   Is there brake drag at any of the wheels?

   YES 

   Go to step 5.

   NO 

   Check the brake pedal position switch adjustment and pedal free play .

5. Caliper check

   -1. Loosen the bleed screws at each caliper, then spin the wheels to check for brake drag.

   Is there brake drag at any of the wheels?

   YES 

   Check the pedal feel simulator reservoir for contamination in the brake fluid. If you find contamination, flush the entire brake system of all contaminated fluid, then replace all rubber parts in the brake system that were exposed to contaminated fluid. If the brake fluid is OK, disassemble and repair the caliper on the wheel(s) with brake drag.

   NO 

   Look for and replace any damaged brake lines. If all brake lines are OK, replace the VSA modulator-control unit .