2. Remove the wheel.
3. Release the handbrake
4. Remove the drum.
5. Measure the thickness of the pads. The minimum thickness of the overlay is 0.5 mm.
Attention: replace brake pads and friction linings only as a set at the same time on both brake mechanisms.
6. If the drum was removed, reinstall it.
7. If the wheel has been removed, replace it.
8. Lower the car.
Removal, check and installation, brake drums of back brakes
Each time the drums are dismantled, they must be completely cleaned and inspected for cracks, nicks, deep grooves, or out-of-tolerance drum ovality.
Cracked drums are not safe for further use and must be replaced. Do not attempt to use welding to repair a cracked drum. Clean up any minor nicks.
Deep or multiple nicks cause severe wear on the brake linings, so resurfacing of the drum brake surface may be required.
If the friction linings are slightly worn but still repairable and the drum is grooved, then sand the drum with fine sandpaper, but do not rebuild it. Eliminating all the grooves on the drum and smoothing out the grooves on the friction linings will remove too much material from the friction lining surface. If they are left as is, the grooves and furrows will wear in and satisfactory performance can be achieved. If it is necessary to replace the friction linings, restore the grooved drum. A grooved drum operated with new friction linings will not only wear out the friction linings, but will also make it difficult, if not impossible, for the normal braking process.
The ovality of the drum makes it impossible to fine-tune the brake pads and possibly causes excessive wear on the rest of the brake mechanism. In addition, a brake drum with excessive ovality can cause severe and uneven tread wear as well as brake pedal pulsation.
The amount of wear or the degree of ovality of the drum can be accurately measured using an internal micrometer equipped with suitable additional rods. When measuring drum wear or out-of-roundness, measure from the inside edge to the outside edge of the machined surface at 90-degree intervals around the drum perimeter. If the measured values exceed the specified ovality limits, rebuild the drum.