Master Cylinder

Master Cylinder (Cutaway View):

The master cylinder is the component of the vehicle's brake system that develops the hydraulic pressure required apply the brakes and stop the vehicle. The master cylinder has two pistons with rubber lip seals located in the bore of the master cylinder that are used to pressurize the brake fluid in the brakes hydraulic system. The brake fluid is pressurized by the force applied to the brake pedal by the driver foot.

The master cylinder has a semi-clear polypropylene reservoir and an anodized aluminum body.

The master cylinder body and pistons are not serviceable or replaceable components of the master cylinder. The only replaceable component of the master cylinder is the fluid reservoir.

The reservoir is indexed using the roll pin mounting tabs to prevent installation in the wrong direction. The cap diaphragms are slit to allow atmospheric pressure to equalize on both sides of the diaphragm.

The primary and secondary outlet tubes from the master cylinder, are connected to the brake system combination valve. The combination valve is mounted to the frame rail below the the master cylinder. The front port of the combination valve connects to the master cylinder primary outlet tube and supplies the right and left front brakes. The rear of the combination valve connects to the master cylinder secondary outlet tube and supplies both rear brakes.