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Brake booster

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Brake booster #1
GaTech Marvin Jernigan (New Member) Bay City, TX, USA Sign in to contact 1977 MG MGB	Topic Creator (OP) Apr 18, 2024 06:56 PM Joined 18 days ago 1 Posts

I have a 1977 MGB. When ever I press the brake the engine is affected. Do I have a bad brake booster or vacuum leak?

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Re: Brake booster #2
Watauga William B Richmond, IN, USA Sign in to contact 1974 MG MGB	Apr 18, 2024 09:48 PM Top Contributor Joined 2 years ago 238 Posts

Marvin, It could be a Booster Vacuum fitting or hose perhaps the Non-return Valve or as Americans call it the Booster check valve or a bad diaphragm or seal in the booster.

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Re: Brake booster #3
lewk Keith Lewis Cambridge, ON, Canada Sign in to contact 1975 MG MGB MkIII "RBLUEB" 2010 Ford Explorer Sport Trac 2012 BMW 323i	Apr 19, 2024 05:32 PM Top Contributor Joined 18 years ago 4,755 Posts

Check the hose. Depending on how old it is, they do deteriorate and cause a vacuum leak.

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Re: Brake booster #4
Rubber Bumper Nick Marris Fire Island, NY, USA Sign in to contact	Apr 20, 2024 07:48 AM Top Contributor Joined 4 years ago 371 Posts

I've done a bunch of these once you rule out bad hose/valve leak direct your attention to the diaphram here lies your problem.....

many times the rear master cylinder seal will leak oil into and onto the rubber diaphram destroying it

once you seperate the MC from the booster if any oil is present replace the MC as well

good luck

Nick

Edited 1 time(s). Last edit at 2024-04-20 07:48 AM by Rubber Bumper.

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