To ensure reliability, purchase GM part # 1257200 Valve,Brake Combsw Asm. It is sometimes referred to as GM Brake Proportioning Valve. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Cadillac Fleetwood models. It fits Chevrolet G10, G20, P30. It also fits GMC G1500, G2500, G3500.
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