Chevrolet 1988 Light Duty Truck Repair Manual page 319

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 pp ly low a ir p re s s u re very
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.
5. Secondary piston (28).
• W ith the rear port plugged apply a small
am ount of air pressure to the front port.
6
. Secondary seals (29) from the secondary piston (28)
(figure 16).
7. Spring retainer (26) and prim ary seal (27).
8 . Spring (25).
9. Tube seats (if necessary) (figure 17).
• Thread a self-tapping screw into the tube seat
and remove with locking jaw pliers.
Figure 9— Com posite Master Cylinder Components
jjjl
Clean
All the metal parts in denatured alcohol.
All the rubber parts in clean brake fluid.
Stained or discolored cylinder bore with crocus
cloth.
In sp ect
Diaphragm for cuts, cracks, or a swollen condition.
C ylinder bore for scoring or corrosion. If corrosion is
present, replace the cylinder. Do not attem pt to hone
the bore.
0
Install or C o n n ec t (F ig u re 14)
Lubricate all the seals and cylinder bore with clean
brake fluid.
Spring (25).
Prim ary seal (27) and spring retainer (26) onto the
secondary piston (28) (figure 16).
Secondary seals (29) onto the secondary piston
(28).
4. Secondary piston (28).
BRAKES 5-5