TRAILER MAINTENANCE

ELECTRIC BRAKES

Electrically actuated brakes (Figure 66) are similar tohydraulic brakes. the basic difference is that hydraulic brakes are actuated by an electromagnet. listed below are some of the advantages that electric brakes have over hydraulic brakes:

Brake system can be manually adjusted to provide the corrected braking capability for varying road and load conditions.

Brake system can be modulated to provide more or less braking force, thus easing the brake load on the towing vehicle.

Brake system has very little lag time between the time the vehicle’s brakes are actuated and the trailer’s brakes are actuated.

Brake system can provide an independent emergency brake system.

Remember in order to properly synchronize the tow vehicle’s braking to the trailer’s braking, can only be accomplished by road testing. Brake lockup, grabbiness or harshness is due to lack of synchronization between the tow vehicle and the trailer being towed or underadjusted brakes.

Before any brake synchronizations adjustments can be made, the trailer brakes should be burnishedin by applying the brakes 2030 times with approximately a 20 m.p.h. decrease in speed, e.g. 40 m.p.h. to 20 m.p.h. Allow ample time for brakes to cool between application. This allows the brake shoes to slightly be seated into the brake drum surface.

Figure 66. displays the major electric brake components that will require inspection and maintenance. Please inspect these components as required. See Table 13. Electric Brake Troubleshooting.

Magnets For All Electric Brakes

To make certain an electricallyoperated braking system will function properly, you must have your dealer inspect the magnets at least once a year, or each 12,000 miles. See the brake manual for wear and current inspection instructions.

Brake Controller

The electric brake controller is part of the tow vehicle and is essential in the operation of the electric brakes on the

trailer. The brake controller is not the same as the safety breakaway brake system that may be equipped on the trailer.

.

Figure 66. Hydraulic Brake Components

Brake Drums (or discs), Linings, and Hoses

Brake drums or discs must not have cracks longer than one half the width of the friction area. Linings must not be loose, soaked with oil or grease or be dangerously thin. Mechanical parts must be in place, not broken or missing. Check that all air hoses connected to the brake chambers are not worn or cut due to rubbing.

Air Leaks

Always check for brake air leaks before towing the trailer. NEVER tow the trailer with an brake air leak problem.The possibility exists of brake failure.

Table 13. Electric Brake Troubleshooting

Symptom

Possible Cause

Solution

 

Any open circuits or broken wires?

Find and correct.

 

Any short circuits?

Find and correct.

No Brakes or Intermittent Brakes

Faulty controller?

Test and correct.

 

Any loose connections?

Find and repair.

 

Ground wire secure?

Find and secure.

 

Grease or oil on magnets or

Clean or replace.

 

linings?

 

 

Weak Brakes or Brakes Pull to

Connections corroded?

Clean and correct cause of

One Side

corrosion.

 

 

Brake drums scored or grooved?

Machine or replace.

 

Brakes synchronized?

Correct.

 

Brake components loose, bent or

Replace components.

Locking Brakes

broken?

 

 

Brake drums outofround?

Replace.

Noisy Brakes

System lubricated?

Lubricate.

Brake components correct?

Replace and correct.

 

Dragging Brakes

Bearings of the wheel adjusted?

Adjust.

DCA800SSK2 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (09/03/09) — PAGE 43

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Multiquip DCA800SSK2 manual Electric Brakes, Brake Drums or discs, Linings, and Hoses, Air Leaks

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