To ensure reliability, purchase GM part # 18020589 Valve Asm,Brake Combination. It is sometimes referred to as Pontiac 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 Pontiac Firebird models.
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