GMC S Series 1994, Repair Manual

Page: 293 / 919

D. Apply force in a clockwise direction to lock the
front and rear housings.
E. Back off the fixture screw.
F. Stake housing at two tabs 180 degrees apart
(figure 13).
Notice: Do not stake a tab that has previous­
ly been staked. The tab may break at a later
time and system failure may occur.
•
Assembly can be aided by connecting a vacu­
um source to the booster.
25. Lubricate inside and outside diameters of grommet
(4) and front housing seal (7) with a thin layer of
Delco Silicone Lube (GM P/N 18010909) or equiva­
lent.
26. Grommet (4) and vacuum check valve (3).
27. Front housing seal (7).
28. Silencer (2) and boot (1).
GAGING PROCEDURE
Tool Required:
J 37839 Push Rod Height Gage
• Gage the piston rod using J 37839 (figure 14).
A. Apply 85.0 kPa (25 In. Hg.) vacuum or maxi­
mum engine vacuum to the booster.
Figure 14— Gaging the Piston Rod
B. Check the maximum and minimum rod length.
• If the piston rod is not within limits, obtain a
service adjustable piston rod and adjust the
rod to the correct measurement.
SPECIAL TOOLS
J 37839 J 28458
J 23456
J 29282
1. POWER BRAKE PUSH ROD HEIGHT GAGE
2. POWER BRAKE BOOSTER DISASSEMBLY AND
REASSEMBLY TOOL
3. POWER PISTON SEAL PROTECTOR
4. AIR VALVE PUSH ROD RETAINER INSTALLER
V3763