If there isn’t any fluid, you may consider rebuilding or replacing the master cylinder and wheel cylinders. ... Another type of brake system is the electric/hydraulic trailer brake.

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.

With the brakes plumbed up and the tester box in the cab, it’s then simply a case of setting off at a steady pace (target speed of about 30kph), using the hand throttle to keep engine revs at a ...

Selecting and installing brake system components. Now consider the following scenario: 100 pounds of pressure is applied to the same master cylinder with a 1-square-inch piston.

Your vehicle’s brakes are hydraulic, meaning they use fluid to operate (there are also compressed-air brakes, but they’re used on tractor-trailers and other large trucks.