SECTION 4 - SERVICE AND MAINTENANCE
3121224
– Triple-L-Trailer –
4-9
Brake Cleaning and Inspection
- Your trailer brakes must
be inspected and serviced at yearly or 12,000 miles inter-
vals or more often as use and performance requires. Mag-
nets and shoes must be changed when they become
worn or scored thereby preventing adequate vehicle brak-
ing. Clean the backing plate, electromagnet, and brake
shoes. Make certain that all the parts removed are
replaced in the same brake and drum assembly. Inspect
the magnet arm for any loose or worn parts. Check shoe
retractor springs, hold down springs, and adjuster springs
for stretch or deformation and replace if required.
Shoes and Linings
- A simple visual inspection of your
brake linings will tell if they are usable. Replacement is
necessary if the lining is worn (to within 1/16” or less),
contaminated with grease or oil, or abnormally scored or
gouged. It is important to replace both shoes on each
brake and both brakes of the same axle. This is necessary
to retain the “balance” of your brakes.
2
3
1
4
1
0
7
5
6
9
8
1
2
1
1
5
14
1
3*
15
1
0
1. Screw and Washer Assembly
2. Backing Plate Assembly
3. Brake Cylinder Servo (Duo)
4. Cylinder Push Rod
5. Brake Shoe
6. Anchor Post Washer
7. Retractor Spring
8. Adjusting Screw Spring
9. Adjuster Assembly
10. Hold Down Spring and Cup
11. Brake Mounting Nut
12. Lockwasher
13. Brake Cylinder Servo (Uni)
14. Adjuster Slot Plug
15. Brake Shoe Hold Down Pin
NOTE: *Uni-Servo Brakes to be used with surge actuator
Figure 4-6. Hydraulic Brakes