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Trailer brakes should be inspected the fi rst 200 miles of 
operation. This will allow the brake shoes and drums to seat 
properly. After the fi rst 200 mile interval, inspect the brakes 
every 3,000 miles. If driving over rough terrain, inspect the 
brakes more frequently.

Figure 60 displays the major hydraulic surge brake 
components that will require inspection and maintenance. 
Please inspect these components as required using steps 
1 through 8 and Table 15 as listed below:

Place the trailer on jack stands. Make sure the jack 

1. 

stands are placed on secure level ground.

Check the wheel and drum for free rotation.

2. 

Remove the adjusting hole cover from the adjusting 

3. 

slot at the bottom brake backing plate.

With a screwdriver or standard adjusting tool, rotate 

4. 

the star wheel of the adjuster assembly to expand the 
brake shoes.

Adjust the brake shoes outward until the pressure of 

5. 

the lining against the wheel drum makes the wheel 
diffi cult to turn.

Adjust, rotate the star wheel in the opposite direction 

6. 

until the wheel rotates freely with slight lining drag.

Replace the adjusting hole cover and lower the trailer 

7. 

to the ground.

Repeat steps 1 through 7 on the remaining brakes.

8. 

Hydraulic surge brakes (Figure 60) should not require any 
special attention with the exception of routine maintenance 
such as shoe and lining replacement. Brake lines should 
be periodically checked for cracks, kinks, or blockage.

Hydraulic surge braking requires the installation of an 
actuator at the tongue of the trailer. Remember the surge 
or push of the trailer toward the tow vehicle automatically 
synchronizes the trailer brakes with the tow vehicle brakes. 
As the trailer pushes against the tow vehicle the actuator 
telescopes together and applies force to the master cylinder, 
supplying hydraulic pressure to the trailer brakes.

Periodically check and test the surge “actuator” to make sure that 
it is functioning correctly. Never use an undersize actuator.

No Brakes 

Brake line broken or kinked?

Repair or replace.

Weak Brakes or Brakes Pull to 

One Side

Brake lining glazed?

Reburnish or replace.

Trailer overloaded?

Correct weight.

Brake drums scored or grooved?

Machine or replace.

Tire pressure correct?

Infl ate all tires equally.

Tires unmatched on the same axle?

Match tires.

Locking Brakes

Brake components loose, bent or 

broken?

Replace components.

Brake drums out-of-round?

Replace.

Noisy Brakes

System lubricated?

Lubricate.

Brake components correct?

Replace and correct.

Dragging Brakes

Brake lining thickness incorrect or 

not adjusted correctly?

Install new shoes and 

linings.

Enough brake fl uid or correct fl uid?

Replace rubber parts 

fi ll with dot 4 fl uid.