Without Antilock Brakes

Fig. 3 Type 1, Composite Master Cylinder:

This master cylinder is comprised of an aluminum body, pistons, springs, O-rings, cup seals, and a reinforced nylon reservoir. The bore of the aluminum body is anodized for to prevent corrosion and pitting. The reservoir caps contain diaphragms with precision slits for controlled equalization of pressure.
The secondary outlet tube from the master cylinder is connected to the valve mounted under the master cylinder. The front part of this block supplies the right rear and left front brakes. The rear portion of the block connects to the primary outlet tube and supplies the right front and left rear brakes.