With Antilock Brakes

Master Cylinder Assembly:

GENERAL INFORMATION
The Bendix ABX-4 Brake System uses a modified Master Cylinder and Power Brake Vacuum Booster assembly. The Master Cylinder primary and secondary outputs go directly to the Hydraulic Control Unit (HCU). The vehicle uses screw-in proportioning valves at the Hydraulic Control Unit (HCU) instead of the combination valve used in prior designs. With this new design, the chassis brake tubes connect directly from the HCU to the brake flex hose. This vehicle uses a center valve design master cylinder and has a two outlet design with the screw-in proportioning valves attached directly to the HCU. Vehicles equipped with rear drum brakes use a master cylinder with a 21 mm bore diameter, while vehicles equipped with rear disc brake use a 7/8" bore master cylinder.

DESIGN
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 port supplies hydraulic pressure to the right front and left rear brakes. The secondary outlet port supplies hydraulic pressure to the left front and right rear brakes.