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Braking Systems - Electric
Features
Electrically actuated brakes have several advantages over other brake actuation
systems.
1. They can be manually adjusted at the controller to provide the correct
braking capability for varying 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. They have very little lag time from the moment the tow vehicle’s brakes
are actuated until the trailer brakes are actuated.
4. In an emergency situation, they can provide some braking independent
of the tow vehicle.
Parking Brake Option
(Not available on all sizes)
Dexter electric brakes with parking brake option are mechanically operated by
a cable. 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 keeps the drum from rotating under normal
loading conditions.
Self Adjusting Feature
(Not available on all sizes)
Dexter electric brakes may be equipped with a forward self-adjust feature.
This will allow the brakes to adjust on both forward and reverse stops. Brake
adjustment occurs when lining wear results in enough gap between the shoes
and the brake drum surface. This added clearance will allow the adjuster
mechanism to rotate the screw assembly at the bottom of the brake. That action
expands the distance between the shoes and thus closes the gap to the drum
surface.
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