BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de Serviço descarregar pdf (Página 15)

While the BP-R1 can incorporate various crack pressures to accommodate specific

applications, the standard is 4 psi.

Air connections on the BP-R1 are identified with cast, embossed letters for ease of

installation. The letter identification and air line connections are shown below for refer-

ence.

BP-R1 Air Connection

Supply (to reservoir)

Delivery (to brake actuator)

Service (to brake valve rear axle service delivery)

Control (to delivery of trailer supply valve)

Embossed Identification

SUP

DEL

SER

CONN

OPERATION

Initial Charging

During the initial build-up of tractor system air pressure, supply air flows through

internal body and cover passage in the BP-R1 to the blend back piston.

Activating the trailer supply valve (dash control with red octagonal button), simultane-

ously charges the trailer and the BP-R1 control port. Air entering the BP-R1 control

port causes the proportioning piston to move toward its stop in the cover. The integral

inlet and exhaust valve is carried along with the piston until it seats and seals the

exhaust passage. Continued movement of the proportioning piston opens the inlet

valve. With the tractor and trailer air system fully charged, the vehicle may be operat-

ed.

SERVICE BRAKES APPLYING

Tractor/Trailer Combination

Brake application air enters the BP-R1 service port and is conducted through the

service piston to the exhaust diaphragm, which flexes in response to the incoming

air and seals the exhaust passage in the exhaust piston. Air flows around the exhaust

diaphragm, then through the center of both the blend back and proportioning pistons

to the inlet and exhaust valve. Flowing around the inlet valve, application air moves

through a passage in the cover of the top of the service relay piston. In response to air

pressure, the relay piston moves into contact with the exhaust portion of the inlet and

exhaust valve. With the exhaust passage sealed, continued movement of the piston

unseats the inlet portion of the inlet and exhaust valve, allowing supply air from the

reservoir to flow out the BP-R1 delivery ports to the brake actuators.

Air Brake System

Revised 11/15/99

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de Serviço Página 15