M977 Through M985 General Operating Procedures (Cont)
Operate Service Brakes.
Do not press service brake treadle hard three or four
times in a row. Air supply will be used up and service
brakes will not work until air pressure is built up again.
Loss of braking ability can result in serious personal
injury or death.
Make sure AIR PRESS gage (1) reads at least 100 psi (690 kPa).
Push down and hold service brake treadle (2) as needed to slow or
d. Operate Trailer Brakes.
Trailer handbrake control is used only when testing
trailer brakes. Do not use trailer handbrake control
while driving because there is danger of causing the
trailer to skid and jackknife. This could cause an
accident resulting in damage to equipment and injury
or death to personnel.
Slowly pull back trailer handbrake control (1) to test application of
(2) Push trailer handbrake control (1) forward to test release of trailer