Is there a gasket that goes between the firewall and the brake booster when mounted? Or do I need to put some kind of silicone sealant? I don't know if it just bolts up or some type of sealant is needed for mounting brake booster. I'm finally finishing up my car and need help with the small details.

Thanks,

Saro

I think all you need is some type of weather seal to keep moisture from getting into the interior of the car.

Thanks 240zx!

So it has nothing to do with vacuum leakage but more for moisture coming into the interior of the car? Will a clear silicone work in this case then?

Your help is greatly appreciated.

Saro Fagerian

My 240 had some kind of black tar type of sealer, I would use something that wouldn't glue the booster to the firewall like silicone would, you might have to take it off one day

I think it is to keep fumes out of the passenger compartment more than anything, I would probably use something like Permatex #2 it remains pliable and will allow you to remove the booster in the future.

I think it is to keep fumes out of the passenger compartment more than anything, I would probably use something like Permatex #2 it remains pliable and will allow you to remove the booster in the future.

I've seen advice before about keeping fumes out but I don't quite understand. What fumes are we talking about? I would think that if you've got exhaust fumes in the engine compartment then you've got a bad gasket or manifold.

That and maybe an oil leak dripping on to the manifold, nothing like the smell of burnt oil Remember that carbon monoxide is an odorless gas and so you could fill the passenger compartment with it and not know. The hood cowl seal is a good example, what other reason would it serve other than to prevent fumes from escaping from under the hood and being sucked into the cowl vents and heater? So the engine compartment it typically sealed from the passengers compartment to help prevent gassing the occupants. Look around next time you're out, how many of those, shall we say "old classics" you see have a leaking gasket, manifold, exhaust system??? .

Thanks alot guys.