Chevrolet 1988 Light Duty Truck Repair Manual page 321

*"► R em o ve or D isco nn ect (F ig u re 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 com pensating valve seals (45).
5. Valve poppets (46) and springs (47).
• Depress the prim ary piston with a smooth
rounded end tool.
6
. Snap ring (52).
7. P rim ary piston assem bly (51) and piston return
spring (50).
Figure 14—Cast Iron Master Cylinder Com ponents
Bail
Cover
D iaphragm
Body
Spring
Spring Retainer
Prim ary Seal
Secondary Piston
Secondary Seals
Prim ary Piston A sse m bly
Snap Ring
CAUTION: In the following step if air pressure is
used to remove the secondary piston, place the
open end of the cylinder bore approxim ately 25
mm (1-inch) from a padded workbench or other
surface to catch the piston when it comes out
of th e b o re. A p p ly low air p re s s u re v e ry
carefully to ease the piston out of the bore.
Never point the open end of the bore at anyone
when applying air pressure. The piston may
come out of the bore with considerable force
and cause personal injury.
8 . Secondary piston assem bly (49).
• With the front port plugged, apply a
a m o u n t o f a ir
com pensating valve port.
9. Secondary spring (48).
IQ I Clean
All the metal parts in denatured alcohol.
All the rubber parts in clean brake fluid.
BRAKES 5-7
F-00774
small
p re s s u re to th e
fr o n t