To ensure reliability, purchase GM part # 18011037 Piston, Brake Master Cylinder Propn Valve. 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 Buick Century, Lesabre, Regal models. It fits Cadillac Deville, Fleetwood. It also fits Chevrolet Impala, Lumina, Monte Carlo. This also fits Pontiac Bonneville, Grand Am, Grand Prix.
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