CAGING BRAKES - Continued
Brake chamber contains a spring under high pressure. Never work directly behind brake
chamber. If caging bolt will not engage properly, the spring may be broken; do not continue
caging procedures. Failure to comply may result in death or injury to personnel. Seek
medical attention in the event of an injury.
Insert T-end of caging bolt (Figure 22, Item 2) into keyhole (Figure 22, Item 1) in brake chamber. T-end
should be inserted into keyway of metal diaphragm (Figure 22, Item 5) inside brake chamber. Turn caging
bolt one-quarter turn clockwise until caging bolt contacts stop inside diaphragm.
The caging bolt is properly positioned when it cannot be removed by pulling straight out.
Pull on caging bolt (Figure 22, Item 2) to seat it properly.
Place washer (Figure 22, Item 3) and nut (Figure 22, Item 4) onto threaded end of caging bolt
(Figure 22, Item 2).
To cage main spring, tighten nut (Figure 22, Item 4) on caging bolt (Figure 22, Item 2). Visually check to
ensure service push rod is retracting into spring brake chamber. This procedure will compress brake spring
inside brake chamber and release brake at wheel position.
Do not over-torque the caging bolt assembly (35 lb ft [47.46 N·m] maximum).
2.5 in. (6.35 cm.) to 3 in. (7.62 cm.)
Figure 22. Caging Bolt.