chevrolet truck Light Duty Truck 1994 Series, Repair Manual

Page: 285 / 919

CAUTION: 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 sur­
face to catch the piston when it comes out of
the bore. Apply low air pressure very careful­
ly 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.
6. Secondary piston (28).
• W ith the rear port plugged, apply a small
amount of air pressure to the front port.
7. Secondary seals (29) from secondary piston (28).
8. Spring retainer (26) and primary seal (27).
9. Spring (25).
10. Tube seats (if necessary) (figure 7).
• Thread a self-tapping screw into the tube seat
and remove with locking jaw pliers.
IJJ1 Clean
All metal parts in denatured alcohol.
All rubber parts in clean brake fluid.
Stained or discolored cylinder bore with crocus
cloth.
Inspect
Diaphragm for cuts, cracks, or a swollen condition.
Cylinder bore for scoring or corrosion.
— If corrosion is present, replace the cylinder.
— Do not attempt to hone the bore.
Install or Connect (Figures 6 and 8)
• Lubricate seals and cylinder bore with clean brake
fluid.
1. Spring (25).
2. Primary seal (27) and spring retainer on secondary
piston (28).
3. Secondary seals (29) on secondary piston (28).
4. Secondary piston (28).
5. Primary piston assembly (30).
6. Snap ring (31).
• The primary piston must be compressed to
install the snap ring.
7. Diaphragm (23) in cover (22).
8. Cover (22).
9. Tube seats (if removed).
• Seat the tube seats with a spare brake tube nut
(figure 8).
BENDIX MASTER CYLINDER
Remove or Disconnect (Figure 9)
1. Cover (41).
2. Diaphragm (42).
3. Drain brake fluid from reservoir.
4. Bolts (54) and reservoir (44).
5. O-ring (55) and compensating valve seals (45).
6. Valve poppets (46) and springs (47).
7. Depress primary piston with a smooth rounded end
tool.
8. Snap ring (52).
9. Primary piston assembly (51) and piston return
spring (50).
CAUTION: 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 sur­
face to catch the piston when it comes out of
the bore. Apply low air pressure very careful­
ly 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.
10. Secondary piston assembly (49).
• With the front port plugged, apply a small
amount of air pressure to the front compensat­
ing valve port.
11. Secondary spring (48).
IJJI Clean
• All metal parts in denatured alcohol.
• All rubber parts in clean brake fluid.
• A stained or discolored cylinder bore with crocus
cloth.
I?
Inspect
• Diaphragm for cuts, cracks, or a swollen condition.
• Cylinder bore for scoring or corrosion.
— If corrosion is present, replace the cylinder.
— Do not attempt to hone the bore.