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Bendix

E-5

™

Brake Valve

FIG. 1

DESCRIPTION

™

The Bendix

E-5

brake valve is a single circuit brake valve

that provides the driver with single point control of the service

brake system. The valve is a suspended pedal operated

valve, normally mounted on the engine firewall within the

vehicle cab. Porting consists of 7 supply ports, 4 delivery

ports, and one (1) 1/8 in. P.T. auxiliary supply port. Additional

identified delivery and supply ports serve as a manifold for

accessory devices. The exhaust port is equipped with a

diaphragm.

OPERATION

Applying

Applying the pedal exerts a force on the plunger, through

the rubber graduating spring and to the piston. The piston

moves and its stem, which is the exhaust seat, closes the

exhaust. As the exhaust closes, the inlet valve moves off its

seat. Air pressure from the reservoir then flows in by the

inlet valve and out the delivery ports to the air chambers

applying the brakes.

FIG. 2

Balanced

When air pressure in the cavity beneath the piston and the

air pressure being delivered to the brake actuators equals

the mechanical force on the top of the piston, the piston lifts

and the inlet valve closes, stopping any further flow of air

from the supply line through the valve. The exhaust remains

closed, preventing any escape of air through the exhaust

port.

When brake applications are made in the graduation range,

the valve reaches a balanced position as the air pressure

beneath the piston equals the effort exerted by the driver's

foot on the pedal. When the piston is fully depressed, the

inlet valve remains open and reservoir pressure is delivered

to the air chambers.

Releasing

If the pedal application is released and mechanical force is

removed from the top of the piston, the force produced by

the air pressure beneath the piston is then greater, and the

piston lifts, opening the exhaust in the valve. The air below

the piston and in the delivery lines is then exhausted through

the exhaust port.