Brake Master Cylinder: Description and Operation

Primary And Secondary Ports Without ABS:

GENERAL INFORMATION
This vehicle uses 2 differently designed master cylinder assemblies depending on whether the vehicle is or is not equipped with antilock brakes. Proportioning valves are mounted directly in the rear wheel chassis brake tubes. This new style proportioning valve replaces the combination valve used in prior designs. With this new design, the chassis brake tubes connect directly from the master cylinder to the brake flex hose. This vehicle uses a standard compensating port master cylinder. The master cylinder is a 4 outlet design. All vehicles are equipped with a master cylinder having a bore diameter of 22.2 mm.

DESIGN OF MASTER CYLINDER
The brake system master cylinder assembly consists of the following components. The body of the master cylinder is an anodized aluminum casting. It has a machined bore to accept the master cylinder piston and threaded ports with seats for hydraulic brake line connections. The brake fluid reservoir of the master cylinder assembly is made of a see through polypropylene type plastic. The primary outlet ports supply hydraulic pressure to the right front and left rear brakes. The secondary outlet ports supply hydraulic pressure to the left front and right rear brakes.