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Pete_89T2 · 08-10-2011, 08:55 PM

The largest port on the back of the intake manifold is the one you need to use for the brake booster. By any chance did you discard the original stock hose without saving the plastic 1-way check valve that was inside it for reuse in the new hose? You'll need that for proper brake booster operation. On the S5T2, that check valve is located inside the stock hose on the brake booster end, probably the same location on the S4.

08-10-2011, 08:55 PM	#2
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	The largest port on the back of the intake manifold is the one you need to use for the brake booster. By any chance did you discard the original stock hose without saving the plastic 1-way check valve that was inside it for reuse in the new hose? You'll need that for proper brake booster operation. On the S5T2, that check valve is located inside the stock hose on the brake booster end, probably the same location on the S4.