INSPECTION PROCEDURE 4: Brake Drag: Diagnosis
- STEP 1. Check the parking brake lever return.
Q: Is there fault?
YES : Repair it. Then go to Step 10.
NO: Go to Step 2.
- STEP 2. Check the parking brake pull amount.
Refer to On-vehicle Service - PARKING BRAKE LEVER STROKE CHECK AND ADJUSTMENT .
Q: Is there fault?
YES : Adjust it. Then go to Step 10.
NO: Go to Step 3.
- STEP 3. Check the brake pedal return spring for deterioration.
Q: Is there deterioration?
YES : Replace the spring. Then go to Step 10.
NO: Go to Step 4.
- STEP 4. Check the brake shoe springs for breakage.
Q: Are the brake shoe springs broken?
YES : Replace the spring. Then go to Step 10.
NO: Go to Step 5.
- STEP 5. Check the amount of grease at each sliding section.
Refer to DISASSEMBLY AND ASSEMBLY or refer to - PARKING BRAKE DRUM .
Q: Is the grease amount low?
YES : Apply grease. Then go to Step 10.
NO: Go to Step 6.
- STEP 6. Check the clearance (too low) between the pushrod and primary piston.
Refer to MASTER CYLINDER ASSEMBLY AND BRAKE BOOSTER .
Q: Is there fault?
YES : Adjust the clearance. Then go to Step 10.
NO: Go to Step 7.
- STEP 7. Check the master cylinder piston return spring for damage and return port for clogging.
Refer to MASTER CYLINDER .
Q: Is there damage?
YES : Replace the part. Then go to Step 10.
NO: Go to Step 8.
- STEP 8. Check port for clogging.
Q: Is the port clogged?
YES : Repair it. Then go to Step 10.
NO: Go to Step 9.
- STEP 9. Check disc brake pistons for sticking.
Depress the brake pedal, then release. Confirm each wheel spins freely.
Q: Are all wheels stuck?
YES : Inspect that brake assembly. Then go to Step 10.
NO: Go to Step 10.
- STEP 10. Recheck symptom.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO: Start over at Step 1. If a new symptom surfaces, refer to the symptom chart.