Toyota Previa 1991-1997 Repair Information

Brake Shoes

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INSPECTION



See Figures 1 through 5

When servicing drum brakes, only dissemble and assemble one side at a time, leaving the remaining side intact for reference.

  1. Inspect all parts for rust and damage.
  2.  
  3. Measure the lining thickness. The minimum allowable thickness is 0.039 inch (1.0mm). If the lining does not meet the minimum specification, replace it.
  4.  



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Fig. Fig. 1: Using a ruler, measure the shoe lining thickness



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Fig. Fig. 2: There is a hole in the backing plate to inspect the brake shoe lining thickness

If one of the brake shoes needs to be replaced, replace all the rear shoes in order to maintain even braking.

  1. Measure inside diameter of the drum as detailed in this Section.
  2.  
  3. Place the shoe into the drum and check that the lining is in proper contact with the drum's surface. If the contact is improper, repair the lining with a brake shoe grinder or replace the shoe.
  4.  
  5. To measure the clearance between brake shoe and parking brake lever, temporarily install the parking brake and automatic adjusting levers onto the rear shoe, using a new C-washer/shim. Replace the shim with the correct size, check the chart. With a feeler gauge, measure the clearance between the shoe and the lever. The clearance should be 0.013 inch (0.35mm). If the clearance is not as specified, use a shim to adjust it. When the clearance is correct, stake the C-washer with pliers.
  6.  



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Fig. Fig. 3: Using a feeler gauge, measure the clearance between the shoe and lever



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Fig. Fig. 4: C-washer/shims come in many sizes



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Fig. Fig. 5: Removing and installing a C-clip/shim

REMOVAL & INSTALLATION



See Figures 6 through 10

When servicing drum brakes, only dissemble and assemble one side at a time, leaving the remaining side intact for reference.

  1. Loosen the rear wheel lug nuts slightly. Release the parking brake.
  2.  
  3. Block the front wheels, raise the rear of the vehicle, and safely support it with jackstands.
  4.  
  5. Remove the wheel lug nuts and the wheel.
  6.  
  7. Remove the brake drum.
  8.  

Do not depress the brake pedal once the brake drum has been removed.

  1. Carefully unhook the return spring from the leading (front) brake shoe.
  2.  



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Fig. Fig. 6: Using a brake tool, remove the return spring from the front brake shoe

  1. Press the hold-down spring retainer in and turn the pin on the front brake shoe.
  2.  
  3. Remove the hold-down spring, retainers and the pin for the front brake shoe.
  4.  



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Fig. Fig. 7: The hold-down spring, 2 cups and pin are removed with a brake tool also

  1. Pull out the brake shoe and unhook the anchor spring from the lower edge.
  2.  



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Fig. Fig. 8: When removing the rear shoe, the brake cable will be attached, disconnect it

  1. Remove the hold-down spring from the trailing (rear) shoe. Pull the shoe out with the adjuster, automatic adjuster assembly and springs attached. Disconnect the parking brake cable. Remove the tension/return and anchor springs from the rear shoe.
  2.  
  3. Unhook the adjusting lever spring from the rear shoe and then remove the automatic adjuster assembly.
  4.  

To install:
  1. Inspect the shoes for signs of unusual wear or scoring.
  2.  
  3. Check the wheel cylinder for any sign of fluid seepage or frozen pistons.
  4.  
  5. Clean and inspect the brake backing plate and all other components. Check that the brake drum inner diameter is within specified limits. Lubricate the backing plate at the positions the brakes come in contact with the backing plate. Also lubricate the anchor plate.
  6.  
  7. Mount the automatic adjuster assembly onto a new rear brake shoe.
  8.  
  9. Connect the parking brake cable to the rear shoe, then install the automatic adjusting lever, spring and E-ring. Position the rear shoe so the lower end rides in the anchor plate and the upper end is against the boot of the wheel cylinder.
  10.  
  11. Install the pin and the hold-down spring. Press the retainer down over the pin and rotate the pin so the crimped edge is held by the retainer.
  12.  
  13. Place the front brake into position and install the anchor spring between the front and rear shoes. Stretch the spring enough so the front shoe will fit as the rear did. Install the hold-down spring, pin and retainer to the front brake shoe.
  14.  
  15. Connect the return spring to the front brake shoe.
  16.  
  17. Check the operation of the automatic adjuster mechanism:
    1. Apply the parking brake lever and verifying the adjusting bolt turns.
    2.  
    3. Adjust the strut to where it is the shortest possible length.
    4.  
    5. Install the brake drum.
    6.  
    7. Apply the parking brake lever until the clicking sound can no longer be heard.
    8.  

  18.  



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Fig. Fig. 9: Adjusting the automatic adjusting lever

  1. Check the clearance between the brake shoes and drum:
    1. Remove the brake drum.
    2.  
    3. Measure the brake drum inside diameter and diameter of the brake shoes. The difference is "Shoe-to-drum clearance" and should be approximately 0.024 inch (0.6mm). If incorrect, check the parking brake system.
    4.  

  2.  

A special brake caliper tool is required to gauge the brake drum inside diameter and "Shoe-to-drum clearance". However it is not required to perform brake shoe adjustment.



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Fig. Fig. 10: Inspect the clearance between the brake shoes and drum using a caliper tool

  1. Install the brake drum.
  2.  
  3. Adjust the brake pedal until a slight drag is felt when the drum is spun by hand.
  4.  
  5. Pull the parking lever all the way up until a clicking sound can no longer be heard. Check the clearance between brake shoes and brake drum.
  6.  
  7. Install the rear wheels, tighten the wheel lug nuts and lower the vehicle.
  8.  
  9. Retighten the wheel lug nuts and pump the brake pedal a few times before moving the vehicle. Adjust the rear brakes again if necessary.
  10.  
  11. Check the level of brake fluid in the master cylinder, then perform a test drive.
  12.  

ADJUSTMENTS



All models are equipped with self-adjusting rear drum brakes. 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.

 
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