To ensure reliability, purchase GM part # 18016166 Valve, Brake Master Cylinder Propeller. It is sometimes referred to as Buick 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, Skyhawk, Skylark models.
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