C 2500 Truck 2WD V8-5.7L VIN R (1997)
Brake Master Cylinder: Description and Operation
Master Cylinder
The master cylinder is designed for a system using low-drag calipers. In addition to the standard master cylinder functions, a quick take-up feature is
included on models with a vacuum booster. This provides a large volume of low pressure fluid to the wheels with the initial brake application. The large
volume of fluid helps overcome the clearance created by the caliper pistons and rear brake shoes retracting.
Reservoir and Cover
The reservoir and cover used on these models are made of plastic. The cover snaps onto the top of the reservoir. A seal is located between the cover
and reservoir to keep contaminants out of the brake fluid. The master cylinder reservoir must be kept properly filled. This ensures adequate reserve
fluid and prevents air from entering the hydraulic system. Fluid expansion due to heat absorbed from the brakes and engine makes it important that the
reservoirs not be overfilled.
