K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
12.
Install secondary piston bearing and housing divider over power piston assembly and pushrod.
13.
Install primary diaphragm into the primary support plate, Fig. 8.
14.
Fold primary diaphragm up away from the primary support plate, then install primary diaphragm and support plate over power piston and pushrod
assembly.
15.
Fold primary diaphragm back into position and pull the outside edge of diaphragm over formed flange of housing divider.
16.
Install new diaphragm retainer. Ensure retainer is fully seated.
17.
Install silencer, reaction retainer and piston rod.
18.
Lubricate inside and outside diameters of primary piston bearings with silicone grease.
19.
Install primary piston bearing into rear housing.
20.
Install power piston assembly into rear housing, then the return spring.
21.
Mount housing to holding fixture and turn fixture handle to lock the front and rear housings, Fig. 4.
Fig. 5 Brake Booster Lock Tab & Staking Positions
22.
Stake housing in locations shown, Fig. 5. Do not stake a tab that has been staked previously.
23.
Lubricate inside and outside edges of grommet and front housing seal, then install grommet and seal.
24.
Install vacuum check valve, silencer and boot.
25.
Ensure piston rod depth is within specifications using gauge tool No. J-37839 or equivalent.
