Without Antilock Brakes

This vehicle is available with three different master cylinders. The vehicle uses screw-in proportioning valves at the master cylinder or in-line proportioning valves located in the rear chassis brake tubes instead of a combination valve. With this new design, the chassis brake tubes connect directly from the master cylinder or Hydraulic Control Unit (HCU) to the front and rear brake flex hoses.

Fig 4 Type 3 Master Cylinder. Less ABS:

Master Cylinder And Vacuum Booster:

Vehicles not equipped with ABS use a standard compensating port master cylinder, while vehicles equipped with ABS use a center valve design master cylinder. In addition, the non-ABS master cylinders are a four outlet design with two screw-in proportioning valves attached directly to the inboard side of the master cylinder housing. The ABS master cylinder is a two outlet design. The primary and secondary outlet on the master cylinder are connected directly to the hydraulic control portion of the Integrated Control Unit (ICU) Vehicles equipped with antilock brakes use in-line proportioning valves mounted in the chassis brake tubes going to the rear brakes. Vehicles equipped with rear drum brakes use a master cylinder with a 21.0 mm bore diameter, while vehicles equipped with rear disc brake use a 22.2 mm bore master cylinder.

The master cylinder 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 type plastic.

Fig 6 Type 3 Primary And Secondary Output Ports. Less ABS:

On Non-ABS master cylinders, the primary outlet ports supply hydraulic pressure to the left front and right rear brakes. The secondary outlet ports supply hydraulic pressure to the right front and left rear brakes.

On the ABS master cylinder, 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.