Inspection Procedure 2: Insufficient Braking Power

INSPECTION PROCEDURE 2: Insufficient Braking Power

DIAGNOSIS

STEP 1. Check that the specified brake fluid is used, its level is correct, and no contamination is found.
Q: Is there a fault?
YES: Refill or replace with the specified brake fluid DOT 3 or DOT 4 Bleed the brakes if necessary. Then go to Step 6.
NO: Go to Step 2.

STEP 2. Check for spongy (not firm) brakes.
1) With engine not running, depress the brake pedal rapidly several times to deplete the booster vacuum reserve.
2) With the brake pedal fully released, depress the brake pedal slowly until it stops.
3) With a measuring device (ruler, etc ) next to the brake pedal, depress the pedal firmly and measure the distance the pedal traveled.
Q: Is the distance greater than 20 mm (0.8 inch)?
YES: Bleed the brakes to remove air in the fluid. Then go to Step 6.
NO: Go to Step 3

STEP 3. Check the brake booster function.
Refer to Testing and Inspection.
Q: Is there a fault?
YES: Replace the brake booster. Then go to Step 6.
NO: Go to Step 4

STEP 4. Check for pinched or restricted brake tube or hose.
Q: Is there a pinched or restricted brake tube or hose?
YES: Replace that complete section of brake tube or brake hose. Then go to Step 6.
NO: Go to Step 5.

STEP 5. Check for oil, water, etc., on the pad contact surfaces of all brakes.
Q: Is oil, water, etc., on the pad contact surface?
YES: Replace the part and determine the source/cause of foreign material. Recheck symptom. Then go to Step 6.
NO: The procedure is complete. Then go to Step 6.

STEP 6. Recheck symptom.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Start over at step 1. If a new symptom surfaces, refer to the appropriate symptom chart. Symptom Chart