ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
5. NO BRAKES OR WEAK BRAKES.
Check brake air chamber (1) for leaks.
Have an assistant apply the brakes in the towing vehicle while you listen for leaks at the brake air
Replace leaking brake air chamber (1). See page 4-68.
Check relay valve (1) operation.
Have an assistant apply brakes at towing vehicle while watching for slack adjuster (2) for
Replace relay valve (1) if there is no movement at slack adjuster (2) or if movement is slow.
See page 4-64.