Master Cylinder Unit Repair; Secondary (Slave) Cylinder And Hydraulic Line Replacement - GMC G Service Manual

228 227 226
229
144. Master Cylinder
220. Seal
221. Adapter
222. Support
223. Shim
224. Plunger
225. Seal
226. Seal
227. Snap Ring
228. Dust Cover
229. Push Rod
230. Spring
Figure 4 — Master Cylinder Components

MASTER CYLINDER UNIT REPAIR

B Remove or Disconnect (Figure 4)
1. Adapter (221) and seal (220).
2. Snap ring (227)
• Pull the dust cover (228) back.
3. Pushrod (107) and plunger (224) by shaking them
out.
4. Seal (226).
5. Spring (230), support (222), seal (225), and the shim
(223).
Clean
• All parts in clean brake fluid.
] Inspect
• Cylinder bore and plunger for scratches, ridges, and
pitting.
• Dust cover for wear and cracking.
225
223 222
224
B-08848
B
Install or Connect (Figure 4)
Lubricate all seals with clean brake fluid.
1. Shim (223) and a new seal (225) with the flat against
the shim (223).
2. Support (222) and the spring (230).
3. New seal (226).
4. Plunger (224) and the push rod (107) in the cylinder
bore.
• Coat the cylinder bore with clean brake fluid.
5. Snap ring (227).
• Push the push rod in.
6. Dust cover (228).
• Coat the inside of the dust cover with grease.
7. New seal (220) and adapter (221).
SECONDARY (SLAVE) CYLINDER
AND HYDRAULIC LINE
REPLACEMENT
Remove or Disconnect (Figure 5)
E
1. Negative battery cable.
• Raise the vehicle.
2. Hydraulic line (142) from the secondary cylinder
(153).
3. Nuts (151) and the secondary cylinder (153).
4. Hydraulic line (142) from the master cylinder (144).
5. Nut (150) and the hydraulic line (142).
• Install the nut (150) to hold the speedometer
cable (B) in place.
? I important
• Cover all hydraulic line openings to keep dirt
and moisture out of the components.
B Install or Connect (Figure 5)
• Uncover the hydraulic line openings.
1. Hydraulic line (142).
• Remove the nut (150).
• Hydraulic line (142) onto the master cylinder
(144).
• Hydraulic line (142) and the nut (150).
Important
m
• The hydraulic line must be upright, as shown.
2. Secondary cylinder (153) and the nuts (151).
3. Hydraulic line (142) onto the secondary cylinder
(153).
• Lower the vehicle.
CLUTCH 7C-7