These have a single piston on just one side; ... Residual valves maintain a small amount of pressure in drum brake systems to keep the wheel cylinder cups expanded.

Duo-servo Bendix-style brakes are easy to identify. They have a single, fixed anchor pin at the top of the backing plate with a dual-piston wheel cylinder mounted below the anchor.

This is the single-piston Kelsey-Hayes disc brake used on the Mustang from 1968-up. ... Disc brake caliper pistons do the same thing wheel cylinder pistons do in a drum brake.

The wheel cylinders expand under fluid pressure, and force the brake shoes against the insides of the drums. If disc brakes are used, calipers, with integral cylinders, clamp down on the rotors ...

Depending on your vehicle, those brake mechanisms are composed of either rotors, calipers, and brake pads; drums, wheel cylinders, and brake shoes; or a combination of the two systems.

Drum brakes are old, but not forgotten. ... The springs, wheel cylinder, and brake lines might need changing, as well. By Tony Markovich. Updated Feb 3, 2025 4:25 PM EST ...