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You are correct ^^^ the check valve has a purpose. However, the engine is typically pulling vacuum while you are trying to stop anyway, so it is not noticeable. If the engine quits, you will have no power-assist brakes (with the check valve you get a couple pumps after the engine quits)
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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