the brake shoes are expanded, and rub against the inside of the drum when the brakes are applied. the shoes are pushed apart by a brake cylinder that is operated by hydrolic pressure sent through the brake lines from the master cylinder when you step on the brake pedal. the brake fluid is what is forced througt the brake lines to the wheel cylinders. springs are attached to the shoes ,and pull them back away from the drums when the pedal is released. it is spring action against hydrolic pressure .
No. Drum brakes expand inside a rotating drum to stop the vehicle, disc brakes squeeze in against a rotating disc.
Yes.
No, they are inferior to disc brakes. Drum brakes were used from the beginning of the auto up until the late 60s. Drum brakes are more prone to overheating than disc brakes. Disc brakes also shed water much better than drum brakes which improves stopping distance in wet conditions. Disc brakes apply pressure more evenly than drum brakes thus improving stopping distance. Disc brakes are superior in every way.
Replacing drum brakes requires that you have special equipment and is rather sensitive work. Remember that a mistake here can be devastating, and make sure you're up to the task. If you decide to do the work yourself, you can find step-by-step instructions at http://www.wikihow.com/Replace-Drum-Brakes.
It is indeed possible, but it is going to be a lot of work. The engineers who designed the car felt that drum brakes would be best for the car, and it is wise to leave them as drum brakes instead of disc.
( 1 ) on each of the rear drum brakes
What about 1993 Pontiac drum brakes, please be specific.
Drum brakes.
This will greatly depend on what kind of brakes you have and which parts you are trying to replace. Do you have disc or drum brakes? If you have disc brakes, do you want to replace the calipers, pads, or rotors? If you have drum brakes, do you want to replace the drum, or the shoes?
The rear brakes on a 1984 Chevy truck are drum brakes.
Disc brakes and drum brakes.
Only the rear brakes are drum brakes. The front brakes are disc brakes. To answer your question, twist the end wing nut by your drum brake. It tightens and adjusts how much you have to press on your rear brake lever.