Inspection Procedure 8
INSPECTION PROCEDURE 8: Squealing Noise When Brakes are not AppliedDIAGNOSIS
STEP 1. Check whether the backing plate is bent or loose and Interfering with the drum Vehicles equipped with rear drum brakes>.
If equipped with rear disc brakes, go to Step 4.
Q: Is there fault?
YES: Replace the part. Then go to Step 10.
NO: Go to Step 2.
STEP 2. Check whether the drum is damaged due to interference with me backing plate or shoe.
Q: Is there damage?
YES: Replace the part. Then go to Step 10.
NO: Go to Step 3.
STEP 3. Check the brake drum for wear and the shoe-to-shoe spring for damage.
Q: Is there wear or damage?
YES: Replace the part. Then go to Step 10.
NO: Go to Step 4.
STEP 4. Check the brake discs for rust.
Q: Are the brake discs rusted?
YES: Remove the rust by using sand paper. If still rusted, turn the rotors with an on-the-car brake lathe. Then go to Step 10.
NO: Go to Step 5.
STEP 5. Check the brake pads for correct installation.
Q: Are the pads installed incorrectly?
YES: Repair it. Then go to Step 10.
NO: Go to Step 6.
STEP 6. Check the calipers for correct installation.
Q: Are the calipers installed incorrectly?
YES: Repair it. Then go to Step 10.
NO: Go to Step 7
STEP 7. Check the wheel bearings for deterioration or damage, and the quality and quantity.
Q: Are the wheel bearings damaged or out of grease?
YES: Apply grease or replace the part. Then go to Step 10.
NO: Go to Step 8.
STEP 8. Check whether the brake booster, master cylinder or wheel cylinder return is insufficient.
Q: Is the brake booster, master cylinder or wheel cylinder return insufficient?
YES: Replace the part. Then go to Step 10.
NO: Go to Step 9.
STEP 9. Adjust the brake pedal or brake booster pushrod.
Q: Is the adjustment value come?
YES: Adjust. 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.