All disc brakes are inherently self-adjusting. No periodic adjustment is either necessary or possible.
See Figure 1
Toyota trucks utilize self-adjusting brakes. The following procedure is necessary only after the brake shoes have been changed.
- Place blocks under the front wheels so that the truck will not roll forward when it is jacked up at the rear.
- Fully release the emergency brake.
- Raise the rear of the truck and support the differential housing with jackstands.
- Remove the plug from the adjusting hole at the bottom of the backing plate.
- Turn the adjusting starwheel to expand the shoes fully. While doing this, have a friend step on the brake pedal occasionally to center the shoes.
- Tighten the shoes until the wheel will not turn when the pedal is released.
- From this position back off the adjuster until the wheel turns with just a slight drag.
- Back off the adjuster an additional five notches. The wheel should turn smoothly. If it does not, back off another two or three notches. Should this fail, check for worn or defective parts.
- Adjust the other wheel in the same manner.
See Figure 2
- Measure the distance between the center (upper surface) of the pedal pad and the floor pad, not the carpet.
- If out of specifications, loosen the brake light switch.
Loosen the locknut, then turn the pedal pushrod until the pedal height is within specifications:
2WD Pick-Up-5.83 inches (148mm)
- Tighten the pushrod locknut to 19 ft. lbs. (25 Nm).
- Move the brake light switch until the plunger is just touching the pedal stopper. Tighten the switch.
- Check the brake pedal free-play.
See Figure 3
- With the engine turned off, depress the brake pedal several times until there is no vacuum left in the brake booster.
- Push the pedal down until resistance is first felt. Measure this distance; it should be 0.12-0.24 inches (3-6mm).
- Adjust the free-play by turning the pedal pushrod.
- Start the engine and recheck the free-play.
- Recheck the pedal height.