Toyota Corolla 1970-1987 Repair Guide

Disc Brake Pads

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CAUTION
Brake pads and 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

INSPECTION



See Figure 1

For proper inspection, the disc brake caliper and the brake pads themselves must be removed. Some later models may have an inspection hole in the brake caliper, but this allows only a small portion of the pads to be seen.



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Fig. Fig. 1: Front disc brake caliper inspection hole-late models

WEAR INDICATORS



See Figure 2

The front disc brake pads are equipped with a metal tab which will come into contact with the disc after the friction surface material has worn near its usable minimum. The wear indicators make a constant, distinct metallic sound that should be easily heard. The sound has been described as similar to fingernails on a blackboard or a field full of crickets. The key to recognizing that it is the wear indicators and not some other brake noise is that the sound is heard when the car is being driven WITHOUT the brakes applied. It may or may not be present under braking but is heard during normal driving.



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Fig. Fig. 2: Disc brake pad wear indicator

It should also be noted that any disc brake system, by its design, cannot be made to work silently under all conditions. Each system includes various shims, plates, cushions and brackets to suppress brake noise but no system can completely silence all noises. Some brake noiseeither high or low frequencycan be considered normal under most conditions. Such noises can be controlled and perhaps lessened, but cannot be totally eliminated.

REMOVAL & INSTALLATION



We recommend replacement of the disc brake pads in axle sets for added safety and reliability

Rear Wheel Drive

See Figure 3

1970-79 MODELS
  1. Raise and support the front of the vehicle on jackstands. Remove the front wheel.
  2.  
  3. Siphon a sufficient quantity of brake fluid from the master cylinder reservoir to prevent the brake fluid from overflowing when removing or installing pads. This is necessary as the piston must be forced into the cylinder bore to provide sufficient clearance to remove the pads.
  4.  
  5. Remove the four clips that hold the caliper guides in position.
  6.  



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Fig. Fig. 3: Exploded view of the front disc brake assembly with guide plates-1970-79 models

  1. Lightly tap out the guides (keys). Remember the correct positioning.
  2.  
  3. Lift the caliper off of the mounting bracket. It may be necessary to rock it back and forth a bit in order to seat the piston so it will clear the brake pads. Position the caliper out of the way and support it with wire so it doesn't hang by the brake lines.
  4.  
  5. Remove the brake pads from the mounting bracket. Do not remove the support springs.
  6.  
  7. A support plate is under each pad; they are not interchangeable and must be replaced correctly. Remove the support plates.
  8.  
  9. Inspect the brake disc (rotor) as detailed in the appropriate section.
  10.  
  11. Inspect the caliper and piston assembly for breaks, cracks or other damage. Overhaul or replace the caliper as necessary.
  12.  

To install:
  1. Replace the support plates in their original positions.
  2.  
  3. Place the new pads in the support bracket over the support springs.
  4.  
  5. Push the piston all the way back into its bore (a C-clamp may be necessary for this operation).
  6.  

The piston must be turned back into its seated position on certain models. Check piston type before seating

  1. Position the caliper over the pads and onto the mounting bracket.
  2.  
  3. Install the caliper guides (retaining keys) and then install the guide retaining pins.
  4.  
  5. Refill the master cylinder with fresh brake fluid.
  6.  
  7. Install the tire and wheel assembly. Lower the vehicle, then pump the brake pedal several times to bring the pads into adjustment. Road test the vehicle.
  8.  

If a firm pedal cannot be obtained, bleed and adjust the brake system. Do not attempt to move the vehicle until a firm pedal is obtained

1980 AND LATER MODELS

See Figures 4 through 14

  1. Raise and support the front of the vehicle on jackstands. Remove the wheel.
  2.  
  3. Siphon a sufficient quantity of brake fluid from the master cylinder reservoir to prevent the brake fluid from overflowing when removing or installing the brake pads. This is necessary as the piston must be forced into the cylinder bore to provide sufficient clearance to remove the pads.
  4.  
  5. Compress the piston in the caliper assembly if necessary.
  6.  
  7. Remove the lower guide bolt. Swing the caliper upward and install a bolt into the torque plate to secure the caliper.
  8.  
  9. Lift out the brake pads and anti-squeal shims.
  10.  
  11. Remove the anti-rattle springs, pad guide plate and support plate.
  12.  
  13. Check the brake disc (rotor) as detailed later in section.
  14.  
  15. Examine the dust boot for cracks or damage, then carefully push piston back into the cylinder bore. Use a C-clamp or other suitable tool to bottom the piston. If the piston is frozen, or if the caliper is leaking hydraulic fluid, it must be overhauled or replaced.
  16.  

To install:
  1. Compress the piston in the caliper assembly. Install new pad support plates, guide plates and anti-rattle springs into the torque plate.
  2.  

Be careful of the proper installation direction

  1. Install new pad wear indicator clips onto each pad. Install a new anti-squeal shim onto the backing of the piston side pad, then position the pads into the torque plate.
  2.  
  3. Remove the bolt from the torque plate, swing the caliper into position, insert the guide bolt and tighten it to 14 ft. lbs. (19 Nm).
  4.  
  5. Refill the master cylinder with fresh brake fluid.
  6.  
  7. Install the tire and wheel assembly and then pump the brake pedal several times to bring the pads into adjustment. Road test the vehicle.
  8.  

If a firm pedal cannot be obtained, bleed and adjust the brake the system. Do not attempt to move the vehicle until a firm pedal is obtained



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Fig. Fig. 4: Use a bolt to secure the brake caliper



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Fig. Fig. 5: Hardware positioning



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Fig. Fig. 6: View of the front disc brake system



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Fig. Fig. 7: Compress the front brake caliper using a C-clamp



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Fig. Fig. 8: Remove the lower retaining bolt or pin of the brake caliper



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Fig. Fig. 9: Swing the brake caliper upward to remove the brake pads



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Fig. Fig. 10: Remove the outer brake pads



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Fig. Fig. 11: Remove the inner brake pads



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Fig. Fig. 12: Remove the brake pad support plate (brake hardware) keep one side together for quick reference upon installation



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Fig. Fig. 13: Exploded view of the front disc brake assembly with retaining pins or bolts-RWD models



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Fig. Fig. 14: Exploded view of the front disc brake assembly-RWD models

FWD Models

See Figure 15

  1. Raise and support the front of the vehicle on jackstands. Remove the wheel.
  2.  
  3. Siphon a sufficient quantity of brake fluid from the master cylinder reservoir to prevent the brake fluid from overflowing the master cylinder when removing or installing the brake pads. This is necessary as the piston must be forced into the cylinder bore to provide sufficient clearance to remove the pads.
  4.  
  5. Remove the two caliper mounting bolts and then remove the caliper from the torque plate. It may be necessary to rock the caliper back and forth a bit in order to seat the piston so it will clear the brake pads. Position the caliper out of the way and support it with wire so it doesn't hang by the brake line.
  6.  
  7. Remove the two anti-squeal springs, then lift out the brake pads and the anti-squeal shims.
  8.  
  9. Remove the four pad support plates.
  10.  
  11. Check the brake disc (rotor) as detailed in the appropriate section.
  12.  
  13. Examine the dust boot for cracks or damage, then carefully push the piston back into the cylinder bore. Use a C-clamp or other suitable tool to bottom the piston. If the piston is frozen, or if the caliper is leaking hydraulic fluid, the caliper must be overhauled or replaced.
  14.  

To install:
  1. Install four new pad support plates into the torque plate.
  2.  
  3. Install new pad wear indicator clips onto each pad. Install new anti-squeal shims onto the backing of each pad, then position the pads into the torque plate.
  4.  

Make sure that the arrow on the pad wear indicator clip is pointing in the direction of rotor rotation when the pad is installed into the torque plate

  1. Install the two anti-squeal springs.
  2.  
  3. Position the caliper on the torque plate, insert the mounting bolts and tighten them to 18 ft. lbs. (24 Nm).
  4.  
  5. Refill the master cylinder with fresh brake fluid.
  6.  
  7. Install the tire and wheel assembly. Lower the vehicle, then pump the brake pedal several times to bring the pads into adjustment. Road test the vehicle.
  8.  

If a firm pedal cannot be obtained, bleed and adjust the brake system. Do not attempt to move the vehicle until a firm pedal is obtained



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Fig. Fig. 15: Exploded view of the front disc brake assembly-FWD models

 
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