BENDIX BP-1 BRAKE PROPORTIONING VALVES Handmatig

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Bendix

BP-1

Brake Proportioning Valves

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3/8 P.T.

SUPPLY PORT

1/8 P.T.

CONTROL PORT

3/8 P.T.

DELIVERY PORT

FIGURE 1 BP-1

BRAKE PROPORTIONING VALVES

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DESCRIPTION OF THE BP-1

The BP-1

brake proportioning valves are incorporated into

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the air brake systems to improve the controllability and

reduce the stopping distance of bobtail tractors during

braking. BP-1

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, front and rear, valves reacting to the lack of

pressure in the trailer supply line reduce the braking effort

on the rear axles and increase the braking effort on the front

axle of tractors operating in the bobtail mode. Treadle

application force during bobtail operation resembles treadle

application force during normal operation with a connected

trailer.

A typical brake proportioning system is shown in Figure 6.

The system consists of a front and a rear brake proportioning

valve and a TR-3

valve.

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Caution: The BP-1

front and BP-1

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in appearance but are NOT interchangeable. Note

identification tag attached to one of the cover

screws (Figure 1); it will be stamped 'BP-1 Front'

VALVES

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rear valves are similar

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1.5

MOUNTING

PIECE NO.

STAMPED HERE

I.D. TAG STAMPED

BP-1 FRONT OR

BP-1 REAR

or 'BP-1 Rear'. The BP-1

without installing a BP-1

vehicle does not have a front axle ratio valve. If the

vehicle has a front axle ratio valve, the ratio valve

must be replaced with a BP-1

OPERATION

A tractor that is equipped with the BP-1

proportioning valve and TR-3

following manner. With the trailer supply valve pushed in

and a service brake application made, equal pressure (100%

of service application) will be delivered to each axle of the

tractor and trailer. When the trailer is disconnected from the

tractor and the trailer supply valve is pulled out, the front

axle of the tractor will receive 100% of the service brake

application pressure and the rear axle or axles approximately

25%. As application pressure increases, the differences

between the front axle and the rear axle(s) pressures

diminish.

.340"

HOLES (2)

rear valve can be used

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front valve, providing the

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front valve.

rear brake

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valve only will respond in the