Figure 12-22.-Typical independent-type brake system.
to the fluid line, which is connected to the brake
assembly in the wheel. This action results in the friction
necessary to stop the wheel.
When the brake pedal is released, the master
cylinder piston is returned to the OFF position by a
return spring. Fluid that was moved into the brake
assembly is then pushed back to the master cylinder by
a piston in the brake assembly. The brake assembly
piston is returned to the OFF position by a return spring
in the brake.
The typical master cylinder has a compensating port
or valve that permits fluid to flow from the brake
chamber back to the reservoir when excessive pressure
is developed in the brake line due to temperature
changes. This feature ensures against dragging or locked
Various manufacturers have designed master
cylinders for use on aircraft. All are similar in operation,
differing only in minor details and construction. Two
types of master cylinders, the Goodyear and the
Gladden, are described and illustrated in this section.