Toyota Tercel 1984-1994 Repair Guide

Wheel Cylinders

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CAUTION
Brake shoes may contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from brake surfaces! When cleaning brakes, use commercially available brake cleaning fluids.

REMOVAL & INSTALLATION



See Figure 1


CAUTION
On models equipped with a Supplemental Restraint System (SRS) or "air bag,'' work must NOT be started until at least 90 seconds have passed from the time that both the ignition switch is turned to the LOCK position and the negative cable is disconnected from the battery.

For reasons of safety and reliability, we recommend that if one wheel cylinder requires replacement, both cylinders should be replaced as a set.

If wheel cylinders are leaking or seized, they should be replaced. The units are inexpensive enough to make replacement a better choice than repair. Even if the pistons and seals can be replaced, the internal bore can rarely be restored to perfect condition. A faulty repair can reduce braking force on the wheel or cause a leak which soaks the brake shoes in fluid.

When inspecting the cylinders on the car, the rubber boots must be lifted carefully and the inner area checked for leaks. A very slight moistness usually coated with dust is normal, but any accumulation of fluid is evidence of a leak and must be dealt with immediately.

  1. Remove the rear brake shoes and hardware.
  2.  
  3. Using a line or flare nut wrench, disconnect the brake line from the back of the cylinder. This joint may be dirty or corroded. Clean it off and apply penetrating oil if necessary. Do not allow the threaded fitting to twist the brake line. Plug or tape the brake line to prevent leakage.
  4.  
  5. Loosen the bolts securing the wheel cylinder to the backing plate carefully (to prevent breaking the bolts), then remove the bolts.
  6.  
  7. Remove the wheel cylinder from the backing plate. Drain the remaining fluid into a container.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Removing the wheel cylinder

  1. Install the cylinder onto the backing plate and tighten the mounting bolts to 7 ft. lbs. (10 Nm).
  2.  
  3. Carefully reinstall the brake line and tighten it to 11 ft. lbs. (15 Nm).
  4.  
  5. Install the shoes and hardware.
  6.  
  7. Install the brake drum and wheel.
  8.  
  9. Bleed the brake system. Repeat bleeding may be needed to eliminate all the air within the line and cylinder. Refer to the necessary service procedures in this section.
  10.  

 
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