Frame Mounted Booster Main Cylinder - Chevrolet 10 1971 Series Chassis Service Manual

1 P r im a r y Piston Seal Cup
2 P r im a r y Piston
3 Cover Seal
4 R e se rv o ir Cover
5 Gasket
6 Cover Bolt
7 Intake P ort
8 By-Pass P ort
9 R e se rv o ir Housing
9. Test brakes and make any necessary adjustments if
operation is not satisfactory.
Disassembly (Fig. 3 7)
1. Remove cylinder cover bolt and gasket.
2. Lift off reservoir cover and cover seal. Pour out any
excess fluid and stroke piston to force fluid through
outlet ports.
3. Remove piston stop bolt and gasket from bottom of
reservoir housing.
4. Use snap ring pliers and remove retainer ring from
groove in end of cylinder bore.
5. Remove stop plate.
6. All internal parts should slide easily out of cylinder
bore, if they do not, apply compressed air carefully
at front outlet port. If parts do not remove easily,
examine bore carefully for extensive damage which
may eliminate the possibility of reconditioning the
master cylinder.
Cleaning and Inspection
Clean all parts in denatured alcohol or brake fluid. If
reservoir housing is degreased, finish clean to remove
all trace of other solvents, inspect cylinder bore for
scratches or corrosion. Minor blemishes can be removed
10
Tube Seat
11 Secondary Piston Return
Spring
12 Secondary Piston P re ssure
Cup
13 Floating Secondary Piston
14
Secondary Piston Seal Cup
15 Gasket
Fig. 37— Frame Mounted Booster Main Cylinder
with crocus cloth or a clean-up hone.
Check by-pass ports in both reservoirs to make sure
they are open and free of burrs.
Remove and discard all rubber parts. All rubber parts
are included in repair kit which is available from regular
service parts sources.
Assembly
1. Coat all parts with a liberal amount of brake fluid.
2. Install rubber seal cup on secondary piston with cup
3. Stack and install secondary piston spring, pressure
4. Install piston stop bolt and gasket, making sure
5. Assemble and install primary piston parts in cylinder
6. Install stop plate in cylinder bore.
7. Compress all parts in cylinder bore and install re­
8. Install reservoir cover and seal.
16 Stop B olt
17
P r im a r y R e tu rn Spring
R etainer
18
P r im a r y Return Spring
19
P r im a r y Piston Stop P in
20 P r im a r y Piston P re ss u re
Cup
21
Stop Plate
22 R etaine r Ring
lip facing rear (open end of cylinder).
All other cup lips face opposite direction
NOTE:
(closed end of cylinder).
cup and piston in cylinder bore.
screw enters cylinder bore behind rear of piston.
bore.
tainer ring in groove.
BRAKES 5-19
10-30 CHEVROLET TRUCK SERVICE MANUAL