Wear appropriate eye protection when working
under vehicle due to the possibility of falling
debris. Failure to comply may result in injury
Air system pressure must be in the 90-120 psi
operating range to begin brake system
troubleshooting. If air pressure cannot be
maintained within operating range, proceed to
Air System Troubleshooting.
Change 1 2-1691
(1) Loosen air hose 208 at foot control valve
supply port 12 and listen for presence of
(2) If escaping air cannot be heard, replace air
hose 208 (para 11-19).
(3) Tighten air hose 208 on foot control valve
supply port 12.