Lubricating the Drum Brake Shoe Roller
- Park the vehicle on a level surface. Shut down the engine, set the parking brake, and chock the tires.
- Raise the front or the rear axle and then place safety stands under the frame or axle. Be sure that the stands will support the weight of the vehicle.
- Remove the wheels and the brake drums.
- Back off the slack adjusters.
- Push down on the bottom brake shoe and then (by pulling on the roller-retaining clip) remove the bottom cam roller.
- Lift the top brake shoe and then (by pulling on the roller-retaining clip) remove the top cam roller.
- Clean the rollers, retaining clips, and the roller pin recesses in the brake shoes thoroughly.
- Apply a good-quality, multipurpose chassis grease to the retaining clips, brake spider, and the shoe rollers where they contact the brake shoes.
- One at a time, pull each brake shoe away from the cam and install the top and the bottom shoe rollers.
- Install the brake drums and the wheels.
- Remove the safety stands, lower the vehicle, and remove the chocks from the tires.
- In a safe area, drive the vehicle and check for proper brake operation.
Warning: Breathing brake lining dust (asbestos or non-asbestos) could cause lung cancer or lung disease. Unless exposure can be reduced below legal limits, wear an air purifying respirator approved by MSHA or NIOSH at all times when servicing the brakes, starting with removal of the wheels and continuing through assembly.
Caution: Before you back off automatic slack adjusters, see the slack adjuster manufacturer's service information for instructions. Failure to do so could result in damage to the slack adjusters.
Caution: Do not apply grease to the outer diameters of the rollers (where they contact the cam head).
Danger: Do not operate the vehicle until the brakes have been adjusted and checked for proper operation. To do so could result in inadequate or no braking ability, which could cause personal injury, or death, or property damage.
Important: See the slack adjuster manufacturer's service information and adjust the brakes at the slack adjusters.