Brakes And Handbrake - Electric; Features; Operation; Handbrake - MDC MOD BOX 2021 Owner's Manual

Brakes and Handbrake - Electric

Features

Your trailer is fitted with electric brakes that require a brake controller that can be operated from the driver's seat.
1. Manual adjusted to provide the correct braking capability for varying road, off-road and load conditions.
2. They can be modulated to provide more or less braking force, thus easing the brake load on the towing vehicle.
3. There is very little lag time between the moment the tow vehicle's brakes are actuated and the moment the trailer
brakes are actuated.
4. They can provide some braking independent of the tow vehicle in the event of an emergency.

Operation

When electrical current is fed into the system by the controller, it activates the electromagnets in the brakes. These
electromagnets are energized and are attracted to the rotating surface of the drums which moves the actuating levers in
the direction that the drums are turning thus applying pressure from the brake linings to the drum surface

Handbrake

A correctly adjusted handbrake should raise 1/3 to 1/2 of the allowable range at the handbrake handle. Poorly adjusted
handbrakes are dangerous. Under adjusted they may allow the trailer to roll and over adjusted can cause brake linings to
drag and overheat the brakes while driving.
Parking brakes are mechanically operated by cable means. The cable attachment occurs outside of the brake backing
plate. Cable force applied to the parking lever creates a torque through the pivot pin and cam assembly. Torque
transferred to the parking cam results in a spreading force between the primary and secondary shoes. The shoes in turn,
move towards the drum until contact is made. Friction generated between the drum and lining contact surface results in
parking brake capability.
Use the cable adjuster to give enough tension to be able to set the handbrake lever on the last two notches of the
coupling or handbrake is 1/3 raised when unladen. This needs to be checked again when the trailer or camper is loaded.
If the cable is too tight, the brakes will be applied as the axle moves backward under spring deflection.

Adjuster

To adjust the handbrake cable tension release locknuts A, B and C in the diagram Handbrake Adjuster 1 below. To
tighten the handbrake cable turn the adjuster wheel D in a clockwise direction. Once adjusted retighten lock nuts and
test. Always ensure that wheels turn freely when handbrake is off. Overtightened cables can cause brakes to drag and
damage the brake linings.
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