Chevrolet 30 Series 1967 Service Manual page 259

ROTATED 90°
1. Check V a lv e Spring
2. " O " Ring Seal
3. Check V a lv e Retainer
4. Check V a lv e Assembly
5. Body
6. C over
7. Screw
Disassembly (Fig. 74)
NOTE: The key numbers shown below in paren­
thesis refer to Figure 74.
1. Remove screw (7), cover (
( ) from main cylinder body (5). Dump out hydraulic
8
brake fluid.
2. Remove snap ring (10) and' spring retainer (9).
3. Remove spring (12). If necessary, remove " O" ring
seal (27).
4. Remove retainer (14) and unscrew lock ring (13)
counterclockwise.
5. Grasp push rod (11) and slide entire assembly out of
main cylinder body.
. Slide bushing (15) off push rod (11) and discard "O "
6
ring seal (16).
7. Discard piston cup (26).
. Remove retainer (17) and washer (18).
8
9. Disengage snap ring (25) from piston.
10. Slide piston (20) off push rod (11). Discard push rod
cup (19).
11. Slide valve body off end of push rod (11).
12. Remove washer (24), spring (23), and snap ring (25).
13. Remove and discard valve insert (21).
21 22 23 24
Fig. 74—M idland Ross M a in C ylin d er
8. Diaphragm G asket
9. Spring Retainer
10. Snap Ring
11. Push Rod Assembly
12. Push Rod Return Spring
13. Lock Ring
14. Retainer
), and diaphragm gasket
6
25 26 27
15. Push Rod Bushing
16. " O " Ring Seal
17. Retainer
18. Washer
19. Push Rod Cup
20. Piston
21. Piston V a lv e Insert
14. Remove check valve retainer (3) and discard "O "
ring seal ( ).
2
15. Remove check valve (4) and spring (1).
Cleaning
Wash all metal parts in alcohol or equivalent before
reassembly. Do not use a petroleum base cleaning agent.
Coat new block vees and rubber parts with hydraulic
brake fluid.
Assembly
1. Place spring (1) and check valve (4) into end of cyl­
inder body.
2. Place "O " ring seal (2) over check valve retainer (3)
and install check valve retainer into body.
3. Install new valve insert (21) in valve body (22).
4. Slide bushing (15) onto push rod (11). Install new
" " ring seal (16).
0
5. Slide new piston cup (26) onto push rod and into
bushing.
. Replace retainer (17) into piston cup (26). Install
6
washer (18) on push rod.
7. Slide bushing (15), retainer (17), and washer (18)
halfway down push rod.
BRAKES 5-45
22. V a lv e Body
23. Spring
24. Washer
25. Snap Ring
26. Piston Cup
27. " O " Ring Seal
CHEVROLET TRUCK SERVICE M ANUAL