PART NO : AB8465P                          
​

The BP-R1 bobtail proportioning relay valve is a combination of two valves in a single housing. The lower portion contains a "standard" service brake relay valve, which functions as a relay station to speed up brake application and release. The upper portion houses a brake proportioning valve which reduces normal service brake application pressure when the tractor is not towing a trailer (bobtail operation). The control port on the BP-R1 is connected to the Trailer Supply valve delivery and signals bobtail operation.

SUPPLY PORT:
1/2" NPT

DELIVERY PORTS:
3/8" NPT (4)

CONTROL PORT:
1/8" NPT

SERVICE PORT:
1/4" NPT

CRACK PRESSURE:
5.5 PSI

CROSS REFERENCES:
065146, 106931, 108184, 108184x, 108230, 108230x, 108505, 108505x, 109041, 109041x, 109065, 109065x, 109067, 109067x, 109105, 109105x, 65146F3HS2A449BA, 6814291344, 20QE4108M, WA65146, 1622154C91, 2026144C91, 802675, 802681, 802795, 802796, 3918392, 8064515, BPR1.
A cross reference listing means that this valve is a suitable replacement for the part numbers listed. Some changes in air line plumbing may be required.