Normal adjustments of the rear drum brakes are automatic and are made during the reverse applications of the brakes. The following procedure should be used ONLY if the linings have been replaced.
- Raise and support the rear of the vehicle safely using jackstands.
Using a punch and a hammer on the rear of the backing plates, knock out the lanced metal areas near the starwheel assemblies on each plate. The metal areas may already have been removed and covered with rubber adjustment plugs, if so remove the plugs by grasping and pulling with a pair of pliers.
NOTEAfter knocking out the lanced metal areas from the backing plate, the wheels must be removed and all of the metal pieces discarded, then the wheels should be reinstalled for adjustment.
Insert a suitable brake adjustment tool such as J-4735 or equivalent, into the breaking plate slots and engage the lowest possible tooth on the starwheel. Move the end of the brake tool downward to move the starwheel upward and expand the adjusting screw. Repeat this operation until the wheels can JUST be turned by hand. This is a position immediately before the brakes lock.
NOTEThe brake drag should be equal at both wheels.
- Back off the adjusting screws 24 notches (clicks). By the time you have backed off the adjustment 12 clicks, the brakes should have no drag. If a heavy drag is still present, the parking brake cable is likely in need of adjustment.
- Make sure both sides of the brakes are properly adjusted. When backing off the brakes on the other side, the adjusting lever must be backed off the same number of turns to prevent side-to-side brake pull.
- After the brakes are adjusted, install a rubber hole cover into each of the backing plate slots. To complete the brake adjustment operation, make several stops while backing the vehicle to fully equalize the adjustment.
- Road test the vehicle.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions section.
Remove or disconnect the following:
Wheel and tire assembly
- Lubricate the contact points on the backing plate and the adjuster with lithium grease.
Install or connect the following:
Parking brake lever, adjusting screw and spring assembly
Adjust the brakes as follows:
- Remove the knockout area in the backing plate, behind the adjuster assembly.
- Ensure the parking brake system is adjusted properly with no tension on the cables or parking brake lever. The tops of the shoes should be firmly seated against the upper spring retaining anchor, if not as specified, loosen the parking brake cables.
- Install the drum and turn the brake adjuster until the wheels can just be turned by hand.
- Then, back the adjuster off 24 notches. No brake drag should be felt after 12 notches.
- Install an adjusting hole plug in the backing plate to prevent dirt and moisture from entering.
- Readjust the parking brake cable as necessary.
Lower the vehicle, refill the master cylinder and pump pedal to attain full brake pedal before Road-testing the vehicle.