Author Topic: Brake fluid leak between brake booster and master cylinder  (Read 1428 times)

Big Yellow

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Hi all,

Last week I raised the front of my car (230SL - 64) to do some work on the horns, and it was left like that for a week. I then found that I had a puddle of break fluid under the car and that it was leaking between the master cylinder and the brake booster! I also found that the rear compartment of the plastic brake fluid container was empty. I can't understand how this could happen just by raising the front of the car (only 40cm...). The master cylinder is new (~one year old) and I haven't had any problems with the brakes after that was changed.
I'm about to take it off and also thinking I'd take out the brake booster and make sure that is ok. Anyone had problems with leakage between master cylinder and brake booster? Any advise on removal of the brake booster?

Thanks for help and advise,

/ Vidar
Vidar "Big Yellow" Holmdin
MB 230 SL - 1964 manual

Benz Dr.

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Re: Brake fluid leak between brake booster and master cylinder
« Reply #1 on: April 28, 2021, 04:20:58 »
It could be leaking around the grommet that's under the back portion of the tank.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC