Product Description
The Bendix K065763 BP-R1 Bobtail Proportioning Relay Valve is a heavy-duty pneumatic braking component designed to regulate service brake pressure in commercial tractors operating with or without a trailer. Its specialized proportioning design helps provide appropriate braking force during bobtail operation while supporting dependable brake application and release.
When a tractor operates without a trailer, its braking characteristics change significantly because of the reduced vehicle weight. The BP-R1 valve responds to trailer supply pressure signals and adjusts brake delivery pressure to help maintain proper braking balance under varying operating conditions.
The K065763 combines relay valve functionality with pneumatic pressure proportioning, providing rapid brake response while helping reduce excessive brake application pressure during normal tractor-trailer operation. This valve is also designed as a replacement for the discontinued Bendix 800299 AR-2 anti-lock relay valve in compatible systems.
Important product distinction: Bendix K065763 is a BP-R1 bobtail proportioning relay valve, not a conventional R-12 or R-14 relay valve. Its proportioning function and additional control connections are important to its proper operation.
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Genuine Bendix BP-R1 bobtail proportioning relay valve
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Manufacturer Part Number: K065763
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4 PSI nominal crack pressure
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Two 1/2"-14 NPT supply ports
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Two 1/2"-14 NPT horizontal delivery ports
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Two 3/8"-18 NPT vertical delivery ports
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One 1/8"-27 NPT control port
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One 1/4"-18 NPT service port
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Two 5/16"-18 UNC mounting connections
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Universal mounting bracket supplied loose in the box
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Exhaust port equipped with protective dust shield
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Automatic pressure proportioning for compatible tractor brake systems
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Helps maintain appropriate brake balance during bobtail operation
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Operating temperature range: -40°F to 200°F
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Replacement for obsolete Bendix 800299 AR-2 relay valve
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Retrofit instructions included
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New replacement valve
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Sold individually
The K065763 is particularly useful when servicing older commercial vehicles equipped with discontinued Bendix AR-2 relay valves. Its replacement configuration provides a service solution while retaining the required pneumatic braking functions.
Common cross-reference numbers include Bendix 800299, 800186, 800187, 801035, 065330, and Navistar 2501273C91.
Before ordering, verify the original valve part number, control port arrangement, crack pressure, mounting configuration, and air line connections. Replacement installations may require following the supplied retrofit instructions to ensure proper operation.
