TOYOTA PREVIA 91-97 REPAIR MANUAL

BRAKES 9-23

Adjusting Hole

Fig. 86 Insert a brake tool or screwdriver through the backing

plate adjustment hole to reduce the slack of the shoes

2. Block the front wheels, raise the rear of the car, and safely support it
   with jackstands.


3. Remove the lug nuts and the wheel.


4. Tap the drum lightly with a mallet to free the drum if resistance is
   felt. Sometimes brake drums are stubborn. If the drum is difficult to
   remove, perform the following:
   a. Remove the adjusting hole plug, then insert the end of a bent wire
   (a coat hanger will do nicely) through the hole in the brake drum and
   hold the automatic adjusting lever away from the adjuster.
   b. Reduce the brake shoe adjustment by turning the adjuster bolt with
   a brake adjuster tool. The drum should now be loose enough to remove
   without much effort.
   To install:


5. Clean the drum and inspect it as detailed in this Section.


6. Install the brake drum and pull the parking brake lever all the way up
   until a clicking sound can no longer be heard.


7. Verify that the rear wheels will not turn. If the rear wheels turn,
   adjust the parking brake cable as necessary.


8. fielease the parking brake and remove the brake drum. Measure the
   brake drum inside diameter and diameter of the brake shoes. Check that the
   difference between the diameters is the correct shoe clearance. Clearance
   is: 0.024 in. (6mm).


9. If the brake shoe clearance is not correct, adjust the brake shoes
   until the clearance is correct.


10. Reinstall the brake drum, install the wheel(s), and safely lower the
    vehicle. Retighten the lug nuts and pump the brake pedal before moving the
    vehicle.


11. Road test the vehicle for proper brake operation.

INSPECTION

» See Figure 87

1. Clean the drum.


2. Inspect the drum for scoring, cracks, grooves and out-of-roundness.
   Replace the drum or have it "turned" at a machine or brake specialist shop,
   as required. Light scoring may be removed by dressing the drum with fine
   emery cloth.


3. Measure the inside diameter of the drum. A tool called a H-gauge
   caliper is used. See the Brake Specifications chart for your vehicle.

Fig. 87 Place a caliper inside the drum to measure the diameter

Brake Shoes

INSPECTION

» See Figures 88, 89, 90, 91 and 92

servicing drum brakes, only dissemble and assemble

one side at a time, leaving the remaining side intact for refer-

ence.

1. Inspect all parts for rust and damage.

2. 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.
   ••If one of the brake shoes needs to be replaced, replace all the
   rear shoes in order to maintain even braking.

Fig. 88 Using a ruler, measure the shoe lining thickness