Chevrolet 1991 Light Duty Truck Repair Manual page 328

5-8 BRAKES
30. Primary Piston Assembly
31. Snap Ring
Figure 15—Cast Iron Master Cylinder Components
BENDIX MASTER CYLINDER
|+ + | Remove or Disconnect (Figure 19)
1. Cover (41).
2. Diaphragm (42).
• Drain all the brake fluid from the reservoir.
3. Bolts (54) and reservoir (44).
4. O-ring (55) and compensating valve seals (45).
5. Valve poppets (46) and springs (47).
• Depress the primary piston with a smooth
rounded end tool.
6. Snap ring (52).
7. Primary piston assembly (51) and piston return
spring (50).
CAUTION: In the follow ing step if air pressure
is used to remove the secondary piston,
place the open end o f the cylin d er bore
approximately 25 mm (1-inch) from a padded
workbench or other surface to catch the pis­
ton when it comes out o f the bore. A pply low
a ir pressure very carefully to ease the piston
out o f the bore. Never point the open end of
the bore at anyone when applying air pres­
sure. The piston may come out of the bore
with considerable force and cause personal
injury.
26. Spring Retainer
27. Primary Seal
28. Secondary Piston
29. Secondary Seals
Figure 16—Secondary Piston Assembly
F4397
26
27
28
4
29
F4398