Drum brakes have been around a long ... read our article How To Bleed Brake Fluid With a Pneumatic Vacuum Pump. Basically, you’re using a hose attached to the bleeder valves on each wheel ...

These boosters use engine vacuum, an electric pump ... fluid acts on the caliper piston, squeezing the disc brake pads inward, clamping the pads against the brake rotors. On drum brakes the ...