Table 3-1. OPERATOR TROUBLESHOOTING - Continued
TEST OR INSPECTION
18c BRAKES OPERATE SLOWLY OR ERRATICALLY
Step 1. Check air system pressures.
a. Allow air system to recharge.
b. Check air lines for leaks.
c. Check quick release, relay, and spring brake valves for leaks.
d. Check foot treadle valve for leaks.
Step 2. Check tire pressure.
Inflate tires to correct pressure, 70 psi (480 kPa).
Step 3. Ride brakes for 100 yards to check whether there is water in the hubs.
This will dry the shoes and drums.
19 PARKING BRAKES WILL NOT RELEASE
Secondary air pressure is low.
Release parking brakes by pushing emergency release button and holding in until
secondary air reaches 65 psi (450 kPa).