GMC T Series 1994 Repair Manual page 288

1. Boot
2. Silencer
3. Vacuum check Valve
4. Grommet
5. Front Housing Seal
6. Power Piston Bearing
7. Rear Housing
8. Front Housing
9. Return Spring
10. Piston Rod (Gaged)
11. Reaction Retainer
12. Filter
13. Diaphragm Retainer
14. Diaghragm
15. Diaphragm Support
16. Power Piston and
Pushrod Assembly
19. Pushrod
25. Reaction Body
Retainer
C. Use a slight force or impact to dislodge dia­
phragm retainer (13).
12. Diaphragm (14) from diaphragm support (15).
Inspect
1?
All parts for corrosion, nicks, cracks, cuts, scoring,
distortion, or excessive wear. Replace as needed.
Use crocus cloth to polish away minor corrosion of
the housings or diaphragm support.
XJS jl Clean
All parts in clean denatured alcohol.
Do not immerse the power piston assembly in alco­
hol. Wipe it clean with an alcohol dampened cloth.
Dry all parts with dry, unlubricated, compressed air.
Figure 2— Single Diaphragm Vacuum Booster Components
|-»4-| Install or Connect (Figures 1 through 4)
Tools Required:
J 23456 Power Brake Booster Disassembly
and Reassembly Tool
J 28458 Power Piston Seal Protector
1. Diaphragm (14) in diaphragm support (15).
2. Lubricate inside diameter of diaphragm lip with a
thin la ye r of D elco S ilic o n e Lube (GM P/N
18010909) or equivalent.