Brakes and Traction Control: Service and Repair

Operation And Leakage Check

Check All Of The Following Items:










Brake Booster Operating Test
For simple checking of the brake booster operation, carry out the following tests
1. Run the engine for one or two minutes, and then stop it. If the pedal depresses fully the first time but gradually becomes higher when depressed succeeding times, the booster is operating properly, if the pedal height remains unchanged, the booster is defective.




2. With the engine stopped, step on the brake pedal several times.
Then step on the brake pedal and start the engine. If the pedal moves downward slightly, the booster is in good condition. If there is no change, the booster is defective.




3. With the engine running, step on the brake pedal and then stop the engine.
Hold the pedal depressed for 30 seconds. If the pedal height does not change, the booster is in good condition, if the pedal rises, the booster is defective.
If the above three tests are okay, the booster performance can be determined as good.
Even if one of the above three tests is not okay, check the check valve, vacuum hose and booster for defect.





Vacuum Hose (Check Valve)
Inspection
1. Disconnect the brake booster vacuum hose (check valve built in) (A) at the booster (B).
2. Start the engine and let it idle. There should be vacuum available. If no vacuum is available, the check valve is not working properly. Replace the brake booster vacuum hose and check valve and retest.





Brake Pedal Brake Switch Adjustment
Pedal Height

1. Disconnect the brake switch connector, loosen the brake switch locknut (A), and brake off the back switch (B) until it is no longer touching the brake pedal.
2. Lift up the carpet. At the insulator cutout, measure the pedal height (C) from the middle of the left-side center of the pedal pad (D).

Standard pedal height( with carpet removed):
184.5mm(7.26 in.)




3. Loosen the pushrod locknut (A), and screw the pushrod in or out with pliers until the standard pedal height from the floor is reached. After adjustment, tighten the locknut firmly. Do not adjust the pedal height with the pushrod depressed.





Brake Switch Clearance
Screw in the brake switch until its plunger is fully depressed (threaded end (A) touching the pad (B) on the pedal arm) then back off the switch 3/4 turn to make 1.0 - 2.0 mm(0.04 - 0.08 in.) of clearance between the brake switch connector. Make sure that the brake lights go off when the pedal is released.





Pedal Free Play
1. With the engine off, inspect the pedal free play (A) on the pedal pad (B) by pushing the pedal by hand.

Free play:3 - 8 mm (0.12 - 0.31 in.)




2. If the pedal free play is out of specification, adjust the brake switch (C). If the pedal free play is insufficient, it may result in brake drag.