GMC 4000 Series Service Manual page 250

IN STALLIN G TO O L
A N C H O R
PLUNGER
PLUNGER SEAL
Figure 3 6 — Installing Anchor Plunger and Seal
under "Brake Shoe Installation" in this section.
7. Install brake chambers as described pre­
viously.
. Connect all air lines into both chambers.
8
9. Build up air pressure in system and push
parking brake knob in to admit air into outer cham­
bers (with "Fail-Safe" only).
10. With air in outer chambers, turn release
bolt at each chamber (if "Fail-Safe") counterclock­
w ise as far as it will go (approximately 18 turns -
see fig. 42). Brakes are now in operating condition,
either for service brakes or parking.
Figure 3 7 — P lunger Seal Installing Tool D im ensions
G M C S E R V I C E M A N U A L
T-2339
adjust brakes and repeat operating and leakage
tests as previously described.
Figure 3 9 — W e d g e C avity in H ou sin g (" Slots" Show n)
Figure 3 8 — Installing W edge Assembly
11. After brakes are in operating condition,
Sec. 5B
Page 243
AIR BRAKES
T-2340