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Testing MgC brake boosters

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Testing MgC brake boosters #1
marron1979MGB marron1979MGB H Mission, KS, USA Sign in to contact 1954 MG TF 135 1969 MG MGC 1978 MG MGB "Buy Me" ~ For Sale ! ~	Topic Creator (OP) Apr 16, 2024 12:36 PM Joined 1 year ago 33 Posts

Hello. I have a 1969 MGC. We recently did a full brake job consisting of the following parts replacement:
New calipers and pads in front, new rear wheel cylinders and shoes, all new rubber lines, resleaved
Master cylinder by White Post. The air seems to be out of the line and all wheels seem to be working evenly.

The only problem is the pedal seems much harder to depress than it should be. We did not touch the brake busters or their cylinders. My hunch is that the brakes are working against a faulty front or both brake boosters. Both of the boosters were replaced in the 1980’s with aftermarket ones which is a long time ago. There appears to be no fluid leakage under the boosters.

My question is how do you test a faulty brake booster to know what is bad and which or both are weak?

Thanks. Jim

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Re: Testing MgC brake boosters #2
Limey in Hawaii David Hume Kailua Kona, HI, USA Sign in to contact 1968 MG MGC	Apr 17, 2024 12:49 AM Joined 14 years ago 100 Posts

I only have one MGC left but had three MGCs running at the same time thirty years ago. I would have to say.........If you have brake boosters in your car its safe to assume they are not working well! As for a test I can only suggest putting your foot hard on the brake pedal then starting the engine. All being well you should feel the pedal depress a little further with no extra effort from the leg. You could then detach one vacuum line and plug it to isolate one or the other booster and re-test. For me, braking was always an issue with my MGCs but not anymore. I am not a purist, I just want my car to stop, so it now has Toyota four pot calipers and a remotely actuated double diaphragm master cylinder from a Corvette. 'Da Buggah Stops now' Good luck.

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