INSPECTION PROCEDURE 1: Vehicle Pulls to One Side When Brakes are Applied: Diagnosis
- STEP 1. Check for oil, water, etc., on the pad or lining contact surface of all brakes.
Q: Is oil, water, etc., on the pad or lining contact surface?
YES : Replace the part and determine and repair source/cause of foreign material. Then go to Step 8.
NO: Go to Step 2.
- STEP 2. Check the lining and brake drum contact. < Vehicles equipped with rear drum brake >
- If equipped with rear disc brake, go to Step 5.
- Put chalk on the inner surface of the brake drum. Rub the lining against the drum inner surface.NOTE: Clean off chalk after check.
Q: Does the lining wipe off or smudge the chalk across the full width of the lining?
YES : Go to Step 3.
NO: Replace the shoe and lining assemblies on both sides. Then go to Step 4.
- STEP 3. Check the auto adjuster function (Refer to AUTO ADJUSTER FUNCTION CHECK
.)
Q: Is there fault?
YES : Repair it. Then go to Step 8.
NO: Go to Step 4.
- STEP 4. Check the brake drum inside diameter (Refer to BRAKE LINING AND BRAKE DRUM CONTACT CHECK
.)
Q: Is the brake drum inside diameter outside of specifications?
YES : Replace the part. Then go to Step 8.
NO: Go to Step 5.
- STEP 5. Check disc brake pistons for smooth operation.
- With engine not running, depress the brake pedal rapidly several times to deplete booster vacuum reserves.
- Test each disc brake assembly one at a time.
- Remove the lower caliper bolt, then remove caliper from mount.
- Have an assistant slowly depress the brake pedal. Confirm piston(s) extend slowly and smoothly with no jumpiness. Repeat for each disc brake assembly.
Q: Do (does) the piston(s) move correctly?
YES : Go to Step 6.
NO: Disassemble and inspect brake assembly (Refer to DISASSEMBLY AND ASSEMBLY and/or DISASSEMBLY AND ASSEMBLY ). Then go to Step 8.
- STEP 6. Check brake disc(s) for run out (Refer to DISC BRAKE ROTOR CHECK
or REAR DISC BRAKE RUN-OUT CHECK AND CORRECTION
).
Q: Is runout outside of specifications?
YES : Repair and replace as necessary. Then go to Step 8.
NO: Go to Step 7.
- STEP 7. Check brake discs for correct thickness (Refer to BRAKE DISC THICKNESS CHECK
).
Q: Is the thickness outside of specifications?
YES : Repair or replace as necessary. Then go to Step 8.
NO: Go to Step 8.
- STEP 8. Retest the system.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO: Start over at Step 1. If a new symptom appears, refer to the symptom chart.