The pads also need to be replaced if the linings are oily, have deep grooves and chips on them, or if the linings have separated from the base of the pads.
The minimum permissible thickness of the pads is 0.5 mm.
The maximum permissible internal diameter of the drum is 201 mm.
The rear wheel brake pads must only be replaced as a set - all four pads.
Replacing the pads of only one brake mechanism may cause the vehicle to pull to the side when braking.
We show the replacement of pads on the left rear wheel.
The brake pads of the right rear wheel are replaced in the same way.
We remove the wheel.
Using a chisel and a hammer…
…we press out the protective cap of the hub bearing.
We straighten the cotter pin with a screwdriver..
…and using pliers we remove it from the journal hole.
Using a 24 mm socket, unscrew the crown nut of the hub bearing.
Remove the lock washer.
Before removing the brake drum, lower the parking brake lever all the way - the car must be released.
We remove the brake drum assembly with the bearing.
Do not press the brake pedal after removing the brake drum, as the pistons may come out of the wheel cylinder completely.
We clean the brake mechanism parts from dirt.
It is prohibited to use gasoline and diesel fuel to clean brake mechanism parts.
Using a screwdriver, disconnect the front end of the upper tension spring from the gap adjuster lever earring and remove the spring.
We move the upper stops of the brake pads away from the pistons of the wheel cylinder.
We remove the gap adjuster lever earring.
We remove the clearance adjuster lever together with the spring.
We remove the spacer bar assembly.
Using pliers, turn the cup of the brake shoe support spring until the groove in the cup aligns with the tail of the support.
We remove the cup with the spring and take out the support stand from the hole in the brake mechanism shield.
We disconnect the end of the parking brake cable from the drive lever and, having disconnected the end of the lower tension spring from the shoe, we remove the rear shoe with the lever assembly.
We remove the lower tension spring.
We remove the cup with the spring of the front brake shoe support in the same way as the rear one..
…and remove the front shoe.
We check the technical condition of the parts and clean them.
If a ridge has formed on the inner diameter of the brake drum… …we remove it with a scraper.
Using a caliper, measure the inner diameter of the brake drum, the value of which should not be more than 201 mm.
Before installing new pads, clean the threads of the spacer bar tip and ratchet nut and apply a thin layer of plastic grease to the threads.
We install new brake pads on the rear wheel in the reverse order.
Please note…
...that the ratchet nut of the spacer bar, the shackle and the adjuster lever of the right brake mechanism are silver, and the left mechanism is black.
The threaded end of the spacer bar is marked: RH - for the right mechanism; LH — for left-hand mechanism.
Before installing new pads, it is necessary to reduce the length of the spacer bar by tightening the ratchet nut all the way onto the threaded tip.
This must be done in order to install the brake drum.
After installing the brake drum, tighten the rear wheel bearing nut and adjust the bearings (see Adjusting the rear wheel bearings).
We adjust the position of the brake pads.
To do this, press the brake pedal 10–15 times.
In this case, clicks will be heard in the brake mechanisms of the rear wheels from the operation of the mechanism for automatic adjustment of the gaps between the pads and brake drums.
When the clicking stops, the adjustment is complete.
Adjust the parking brake (see Adjusting the parking brake).
We check the ease of rotation of the suspended wheels with the parking brake lever fully lowered.
We check the fluid level in the tank and, if necessary, bring it up to normal.
[The article is reprinted from the website CHEVYMAN]