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the brake pedal, the engine..rough Vacuum Booster REMOVAL & INSTALLATION: REMOVAL & INSTALLATION See Figure 1 Disconnect the negative battery cable. Apply the parking brake. Unplug all necessary electrical connections. Remove the master cylinder from the booster and pull it off the studs, CAREFULLY! It is not necessary to disconnect the brake lines. Disconnect the vacuum hose from the check valve. If necessary, remove the brake light switch. Disconnect the booster pushrod at the brake pedal. Remove the booster mounting nuts, located on the inside of the firewall.   Fig. Fig. 1: Vacuum booster mounting Lift off the booster and remove the gasket. To install: Install the booster with a new gasket. Tighten the booster mounting nuts to 21 ft. lbs. (29 Nm) on all except 1996-98 models. On 1996-98 models, tighten the nuts to 26 ft. lbs. (36 Nm). Install all remaining components. http://www.au tozone.com/autozone/catalog/parts/partsShelf.jsp?...

I have a 1985 chevette when you press on brake pedal the idle goes way down and you can hear air. But the air leak is not coming from the brake pedal. It has standard brakes The brake booster operates on a vacuum created by the engine. There is a thick wall hose connecting the inlet manifold to the booster. The booster has a non return valve in it which allows a couple of pumps of the pedal in the event of the engine stalling. This should allow you to bring the car to a safe stop. You don't say if the brake pedal feels normal but the change in idle is caused by you operating the booster. My guess is that the air noise you can hear is a leak in the hose or the booster itself. This may require the assistance of a good DIY mechanic to determine which it is. Make sure you get the correct thick wall hose if its that, that is faulty, because any normal hose will be sucked flat by the vacuum and you will have no brakes!! Should the hose be OK and the booster be the noise you can h...