No matter how the braking system is protected from external influences, all the same, during prolonged and intensive use of the car, dirt accumulates on the brake drums. If it is not removed in a timely manner, then serious problems can arise.
Contamination of the brake pads may be indicated by deviation in movement during braking, whistling or squealing when braking, or the need to apply additional force when applying the brake. All this is a serious reason to revise the brake system. Given the importance of the braking system, its prevention is best carried out in stationary conditions. This is how it is done on VAZ cars. Raise the axle with a hoist and support it securely.
Then remove the rear wheel and start cleaning the brake drum. Use only dry rags to clean the inside of it. The use of liquid agents or compressed air is not permitted, otherwise cleaning agents may enter the wheel bearings and cause lubrication failure.
Clean the bleed nipple and eccentric heads at the same time. These parts should be rinsed with warm water. If your machine does not have automatic adjustment, start rotating the eccentric heads alternately, gradually increasing the gap between the shoe and the drum to the maximum. In case of difficulty, turn the eccentric to the other side. Then unscrew the adjusting nut a few turns and slightly release the parking brake.
Removing the drum will now be much easier. Otherwise, replacing the old pads with new ones, you will not be able to return the drum to its place. Unscrew the guide pins before removing the drum. Removing the drum is a very laborious operation and in order to somehow facilitate it, moisten the contact point of the axle shaft flange with the drum for some time with brake fluid or kerosene.
After removing the drum, rinse the inside of the drum and the pads with gasoline. This will help keep the friction linings from getting oiled. Before installing the drum back, grease the place of its connection with the flange with a thin layer of lithol-24 or grease. Be careful - excess grease due to centrifugal forces can get on the inner surface of the brake drum and oil the pads.