The master cylinder is a Delco aluminum unit. The system uses a conventional front-to-rear brake split. The primary piston provides fluid pressure to the front brakes. The secondary piston provides fluid pressure to the rear brakes. If pressure is lost in either system, the remaining system is capable of stopping the vehicle.
Reservoir and Cover
The reservoir is made of plastic. Two clips snap the cap onto the reservoir. A diaphragm between the cover and the reservoir keeps contaminants out of the brake fluid.
Keep the master cylinder reservoir properly filled with brake fluid. This ensures adequate reserve brake fluid and prevents air from entering the hydraulic system. Do not over fill the reservoir. The brake fluid absorbs heat from the brakes, and expands. An over-filled reservoir cannot allow fluid expansion.
Master Cylinder Identification
Identifying information is stamped into the master cylinder.
A Delphi master cylinder has the following information stamped into the front surface:
| • | The first two digits are the build code. |
| • | The third digit indicates the year the master cylinder was built (Example: 5 means 1995). |
| • | The last digits indicate the day the master cylinder was built (Example: 271 means the 271st day of the production year). |
