K Yukon/Denali 4WD V8-6.5L DSL Turbo VIN S (1999)
Brake Master Cylinder: Service and Repair
Master Cylinder Overhaul
DISASSEMBLY PROCEDURE
NOTICE: Do not hone the master cylinder bore. When the brake master cylinder is overhauled, it is recommended that the cylinder body be replaced
rather than CLEANED UP by honing the bore. The master cylinder has a hard, highly polished BEARINGIZED surface, which is produced by
diamond boring followed by ball or roller burnishing under heavy pressure. Honing will destroy this hard smooth surface and cause rapid wear of the
rubber cups.
1. Remove the reservoir cap.
2. Drain the brake fluid from the reservoir.
3. Remove the reservoir and two grommets from the master cylinder body.
4. Clamp the master cylinder mounting flange in a vise.
5. Remove the snap ring.
6. Remove the primary piston assembly from the master cylinder body.
7. Remove the seal.
