2. Remove the wheel.
3. Release the handbrake
4. Remove the drum.
5. Measure the thickness of the pads. The minimum thickness of the pad is 0.5 mm.
Caution: Replace brake pads and friction linings only as a set on both brake mechanisms at the same time.
6. If the drum was removed, reinstall it.
7. If the wheel was removed, put it back in place.
8. Lower the vehicle.
Removal, inspection and installation of rear brake drums
Each time the drums are removed, they must be thoroughly cleaned and inspected for cracks, nicks, deep grooves or drum ovality outside of tolerances.
Cracked drums are not safe for further use and must be replaced. Do not attempt to use welding to repair a cracked drum. Clean out any minor nicks.
Deep or multiple nicks will cause severe wear on the brake linings and may require resurfacing of the drum brake surface.
If the friction linings are slightly worn but still rebuildable and the drum is grooved, then sand the drum with fine emery cloth but do not rebuild it. Removing all the grooves from the drum and smoothing the grooves on the friction linings will remove too much material from the friction lining surface. If left as is, the grooves and grooves will rub in and satisfactory operation can be achieved. If the friction linings need replacing, rebuild the drum with grooves. A grooved drum operated with new friction linings will not only wear the friction settings but will also make normal braking difficult, if not impossible.
An oval drum makes it impossible to accurately adjust the brake shoes and may cause excessive wear on the rest of the brake system. In addition, an over-oval brake drum may cause severe and uneven tread wear and pedal pulsation.
The amount of wear or ovality of the drum can be accurately measured using an inside micrometer equipped with suitable additional rods. When measuring the wear or ovality of the drum, measure from the inside edge to the outside edge of the machined surface at intervals of 90 degrees around the perimeter of the drum. If the measured values exceed the specified ovality limits, recondition the drum.
(The material was created based on information from the website: «ChevyMan»)