PART NO : AB8373B In a trailer air brake system, the SR-3 spring brake valve controls the functioning of the spring brakes during parking and emergency applications. It is responsible for automatically applying the spring brakes and preventing trailer air pressure loss in the event of breakaway or supply line failure. The SR-3 valve also prevents the automatic application of the trailer spring brakes after the loss of trailer service reservoir pressure while allowing failure indication to occur in the tractor. MODEL: SR3 DELIVERY PORTS: 3/8" (4) TRAILER SUPPLY PORT: 1/4" SERVICE RES PORT: 1/4" REPLACES: 106834, 101113, 272914 CROSS REFERENCES: K033128, ABC106834, AB8373, SR-3, C51738, 101113 272914, 5006256, 5005810, 108634, M305520.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.
