Visit:
www.abisupport.com
16
Maintenance (cont'd)
1. Grease or oil.
2. Surface scoring, pitting or gouges.
3. Replace both shoes if lubricant contamination or physical damage is present, even if found on only one shoe.
A. Replace both shoes (two) on the brake and on both brakes (four) installed on the same axle. Replace brake parts at
the same time. This will ensure an even braking capacity.
4. Measure lining thickness.
A. Lining thickness shall not be less than 1/16".
I. If lining measures less that 1/16", replace the shoe.
II. Repeat step 3.A.
5. Heat cracks are normal and rarely require attention.
After replacing the brake shoes and linings, burnish-in trailer brakes as follows:
1. Apply the brakes 20-30 times over a 20 m.p.h. decreasing speed range.
A. For example, brake 20-30 times while decreasing in speed from 40 m.p.h. to 20 m.p.h.
B. Make sure ample time is allowed for brakes to cool between application.
I. The cooling period allows the brake shoes and magnets to begin seating to the brake drum.
1. Place hub, bearing, washers and castle nut back on axle spindle in the reverse order from which they were removed. Castle
nut should be torqued to 50 ft.-lbs. Hub will rotate during this process.
2. Loosen castle nut to back off the torque.
3. Tighten castle nut finger tight until snug.
4. Insert cotter pin. If cotter pin does not line up with hole, back castle nut up slightly until pin can be inserted (Fig. 5).
5. Bend cotter pin over to lock nut in place. Nut should be free to move with only the cotter pin keeping it in place.
Shoes and Linings :
Inspect brake shoes and linings for:
Hub Replacement :
To adjust bearings or replace removed hub, follow procedures below:
