SECTION XIV. BRAKE PROBLEMS

TB 9-2300-426-20

SECTION XIV. BRAKE PROBLEMS - 5-TON TRUCKS

1. You will waste money if you trash can the worn out brake shoes on your M39- or M809-series 5-ton trucks. The SMR

code shows the shoes as non-repairable, but that is not true. Direct Support can replace the linings and make them good

to go for a lot less than the cost of new brake shoes.

2. Always replace the front SERVICE glad hand on a 5-ton truck with vented coupling, NSN 2530-00-740-9445. If you

use a regular dummy coupling, the brakes won't release after the driver applies them.

3. That's because the service dummy coupling needs a breather vent to release air pressure. If you have the right

coupling and the brakes lock up, the vent hole may be plugged with dirt or paint.