Master Cylinder

There are 2 different master cylinder designs offered. Vehicles without ABS use a standard conpensating-port master cylinder. Vehicles equipped with ABS, use a center-valve design master cylinder. The non-ABS master cylinder is a 4-outlet design (one for each wheel) with 2 screw-in proportioning valves. One is attached directly to the right side of the master cylinder housing while the other is attached to the bottom. The ABS master cylinder is a 2-outlet design and the brake tubes from these primary and secondary outlet ports lead directly to the Integrated Control Unit (ICU) before going to each wheel. Both master cylinders mount to the power brake booster. The master cylinder is an anodized aluminum casting. It has a machined bore to accept the master cylinder piston and also threaded ports with seats for the hydraulic brake tube connections. The master cylinder has the brake fluid reservoir mounted on top, which gravity feeds brake fluid to the master cylinder when it is required. The reservoir is made of see-through plastic and it houses the brake level switch. When the brake pedal is pressed, the master cylinder primary and secondary pistons apply brake pressure through the proportioning valves (on non-ABS vehicles) and chassis brake tubes to each brake assembly. The brake fluid reservoir supplies the brake hydraulic system with the necessary fluid to operate properly . The non-ABS master cylinder's primary outlet ports supply hydraulic pressure to the left front and right rear brakes. If equipped with ABS master cylinder, outlet ports supply hydraulic pressure to the ICU where it is distributed to the individual wheels. The master cylinder reservoir cap diaphragm is split to allow atmospheric pressure to equalize on both sides of the diaphragm.