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Author Topic: Seal between Master cylinder and brake booster  (Read 4066 times)

Offline 75gmck25

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  • 1975 GMC K25 Camper Special, 350/TH350/NP203
Seal between Master cylinder and brake booster
« on: February 18, 2017, 01:25:13 pm »
I am replacing the master cylinder on my 1975 GMC pickup, and when I pulled off the master cylinder I found a round rubber "cup" seal between the master cylinder and the power brake booster.

The rubber seal is partially broken and the rest of the rubber is in bad shape, so I want to replace it. I think its mainly a dust seal, so I don't think it affects the brakes. However, I can't find it in any online parts lookup (Rockauto, etc.).

Any suggestions on where to find this cup seal?

Thanks,

Bruce
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Offline VileZambonie

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Re: Seal between Master cylinder and brake booster
« Reply #1 on: February 18, 2017, 06:29:35 pm »
It's part of the booster. I don't know if you'll be able to readily find it.
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Offline 75gmck25

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Re: Seal between Master cylinder and brake booster
« Reply #2 on: February 19, 2017, 08:15:40 am »
I ended up buying a new booster to go along with the master cylinder.  Probably not a bad idea oveall, since the booster is probably original to the truck.

I did find a similar seal at a couple of Corvette supply houses, but they wanted $33 just for the seal.  The entire new booster was only about $95.

Bruce
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