GMC T Series 1994 Repair Manual page 293

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.
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
B. Check the maximum and minimum rod length.
SPECIAL TOOLS
J 37839
J 23456
Figure 14— Gaging the Piston Rod
• If the piston rod is not within limits, obtain a
service adjustable piston rod and adjust the
rod to the correct measurement.
J 28458
J 29282
V3763