rsmecham Posted December 18, 2020 Share Posted December 18, 2020 Hey guys recently tore out my old brake booster to get a replacement because we think it's leaking and causing some low vacuum pressure as confirmed by our vacuum tests. Anyone know where to find the gasket that goes in between the firewall and if you can just make one yourself with some gasket maker? I know the gaskets are supposed to be sticky foam but I can't find the gasket anywhere. I have a 1986 2.8l V6. Just replaced it with part %54-74040 from autozone. Link to comment Share on other sites More sharing options...
Pete M Posted December 19, 2020 Share Posted December 19, 2020 this is just a water seal, right? Link to comment Share on other sites More sharing options...
Dzimm Posted December 19, 2020 Share Posted December 19, 2020 You can make your own but don't use a liquid that dries or it will be a PIA to get it back off. The factory gasket is just a piece of white foam that is sandwiched between the booster and firewall. Link to comment Share on other sites More sharing options...
schardein Posted December 19, 2020 Share Posted December 19, 2020 The last time I changed one, which was a while back, I cut a new gasket from a piece of foam tray liner for a Craftsman tool box. Link to comment Share on other sites More sharing options...
AZJeff Posted December 19, 2020 Share Posted December 19, 2020 3 hours ago, schardein said: The last time I changed one, which was a while back, I cut a new gasket from a piece of foam tray liner for a Craftsman tool box. Pretty much any kind of closed cell foam will work. Link to comment Share on other sites More sharing options...
Minuit Posted December 19, 2020 Share Posted December 19, 2020 36 minutes ago, AZJeff said: Pretty much any kind of closed cell foam will work. Link to comment Share on other sites More sharing options...
MiNi Beast Posted December 19, 2020 Share Posted December 19, 2020 what about cork gasket? Link to comment Share on other sites More sharing options...
rsmecham Posted December 20, 2020 Author Share Posted December 20, 2020 Update: I ended up using some cork-rubber gasket and then used RTV to make sure the seal was good and to fill in the extra space for the awkward sizing and shape. Link to comment Share on other sites More sharing options...
AZJeff Posted December 20, 2020 Share Posted December 20, 2020 Cork will work, but it’s not as compliant as the closed cell foam. The gasket is intended to basically be a water shield against any droplets that run down the engine side of the firewall. Link to comment Share on other sites More sharing options...
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