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Just Plain Strange

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Just Plain Strange #1
grafen22 Alonzo Atkinson San Antonio, TX, USA Sign in to contact 1976 MG MGB	Topic Creator (OP) Aug 30, 2016 10:32 AM Joined 12 years ago 280 Posts

When I press on the brake, the RPMs increase and its not my big foot. I can kneel next to the car and press the brake pedal with my hand and the engine RPMs increase. I suspect it has something to do with the brake vacuum system. What do I do to correct this safety issue?

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Re: Just Plain Strange #2
Mustangsix Jack Collins Oviedo, FL, USA Sign in to contact 1969 MG MGC GT 1973 MG MGB GT	Aug 30, 2016 10:42 AM Top Contributor Joined 13 years ago 5,869 Posts

The brake booster diaphragm is probably leaking and will need to be replaced soon.

Ceres Motorsports, LLC. www.ceresmotorsports.com

Ceres Motorsports specializes in the repair, restoration, and customization of classic British cars including MG, Triumph, and many other makes.

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Re: Just Plain Strange #3
tampaguy Jack Shea Elgin, OR, USA Sign in to contact 1967 MG MGB GT Special	Aug 30, 2016 11:22 AM Top Contributor Joined 10 years ago 6,638 Posts

Yep !

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Re: Just Plain Strange #4
dickmoritz Dick Moritz Philly 'burbs, PA, USA Sign in to contact	Aug 30, 2016 11:25 AM Top Contributor Joined 14 years ago 26,273 Posts

What Jack C. said...

Applying the brake is creating a vacuum leak...

Dick

Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

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Re: Just Plain Strange #5
grafen22 Alonzo Atkinson San Antonio, TX, USA Sign in to contact 1976 MG MGB	Topic Creator (OP) Aug 30, 2016 01:35 PM Joined 12 years ago 280 Posts

Thanks and I agree it most likely is the booster diaphragm. I checked the vacuum hose and the one way valve and they are okay. Question: does anyone have a source for a booster repair kit. Moss and other don't seem to carry them anymore only a complete booster unit.

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Re: Just Plain Strange #6
Mustangsix Jack Collins Oviedo, FL, USA Sign in to contact 1969 MG MGC GT 1973 MG MGB GT	Aug 30, 2016 02:55 PM Top Contributor Joined 13 years ago 5,869 Posts

Apple Hydraulics has one.

https://www.applehydraulicsonline.com/products/mgb-booster-repair-kit

Ceres Motorsports, LLC. www.ceresmotorsports.com

Ceres Motorsports specializes in the repair, restoration, and customization of classic British cars including MG, Triumph, and many other makes.

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