Table 4-1. Unit Troubleshooting Chart.
1. BRAKES DO NOT APPLY/WEAK BRAKES, GRABBING
OR UNEVEN BRAKING ACTION.
Tools and Test Equipment:
l Dolly set parked on level surface.
l General mechanics tool kit
l Dolly set coupled to towing vehicle with towing
Common no. 1 shop set
vehicle parking brake applied (para 2-14).
Personnel Required: Two
This sequence of operations
will require one person in the
towing vehicle to apply and
release brakes as directed,
while the second person
observes brake action.
A. Check brake fluid levels in master cylinders on
front and rear dollies (para 3-2).
Lubrication Chart (para 3-2).
B. Shut off service brake air supply to dolly set
at towing vehicle supply valve. Make sure
dolly set air reservoir draincock is closed. Pull
dolly set a few feet while observing dolly set
tires for rotation.
DO ALL WHEELS ROTATE?