REAR DRUM BRAKES
All model years may be equipped with rear drum brakes, which are self-adjusting. Under normal conditions, adjustment of the rear brake shoes should not be necessary. However, if an initial adjustment is required insert the blade of a brake adjuster tool or a screw driver into the hole in the brake drum and turn the adjuster slowly. The tension is set correctly if the tire and wheel assembly will rotate approximately 3 times when spun with moderate force. Do NOT over adjust the brake shoes. Before adjusting the rear drum brake shoes, make sure emergency brake is in the off position, and all cables are free.
The brake pedal height is the distance between the floor of the car and the top of the brake pedal pad. The brake pedal height specification is 6.02-6.42 in. (153-163mm) for the 1986-89 Celica and Celica All-Trac. For the 1990-93 Celica and Celica All-Trac, the brake pedal height specification is 6.638-7.031 in. (168.6-178.6mm) for manual transaxle-equipped vehicles and (6.614-7.008 in. (168-178mm) for the automatic transaxle-equipped vehicles.
To adjust the pedal height perform the following:
- If necessary, remove the instrument lower finish panel, air duct and floor mats to gain access to the pedal and pedal linkages.
- Loosen the stop light switch locknut and loosen the stop light switch until it can be moved freely by hand.
- Loosen the push rod locknut and adjust the height of the pedal by rotating the push rod as needed. Torque the push rod locknut to 19 ft. lbs. (25 Nm).
- Return the stop light switch until it lightly contacts the pedal stop and tighten the two locknuts.
- Start the engine.
- Depress the pedal and have an assistant verify the stop lights illuminate.
Now, stop the engine, check and adjust the pedal free-play as follows:
- With the engine off, depress the brake pedal several times until all the vacuum is removed from the booster.
- Push the pedal by hand until resistance can just be felt and measure the distance from the top of the pedal rubber to the bottom of the carpet. The distance should be 0.12-0.24 in. (3-6mm) for 1986-89 models and 0.04-0.24 in. (1-6mm) for 1990-93 models.
- If the free-play is not correct, loosen the push rod locknut until the free-play is within the given range.
- Start the engine and verify that there is free-play in the pedal.
Check the pedal height again to make sure that is has not been disturbed. To check the pedal height after a free-play adjustment, depress the pedal by foot and measure the pedal reserve distance with the engine running. The pedal reserve distance should be as follows:
1986-88: more than 3.15 in. (80mm) with 110 lb. (50kg) force
- If the pedal reserve distance is not correct, troubleshoot the brake system.
- If all adjustments are satisfactory, install the air duct and lower instrument finish panel.