Leak around brake master cylinder

Mark944na86 · 11-25-2009, 01:23 AM

Here's a brake fluid leak showing up around the base of the brake master cylinder where it join the brake booster drum:

What's the diagnosis? Is this where you would expect to see fluid leaking if the master cylinder seals had failed? Or would this be something else?

zedsn · 11-25-2009, 03:09 AM

Sounds like your brake master is starting to fail. Look inside the car up inside where the brake master rod comes through and you will probably see a trickle of fluid coming down the fire wall as well.

Mark944na86 · 11-25-2009, 03:17 AM

Upon closer inspection, the source of the leak seems to be this grommet where the brake fluid reservoir connects to the master cylinder:

Is this a common source of leaks?

zedsn · 11-25-2009, 03:23 AM

I believe you should repalce your brake master cylinder. They will leak from the back when going bad.

Rasta Monsta · Rasta Monsta's Garage

. . .and as zed said, check inside around the brake pedal. If there is brake fluid on your floorboard, scrub it out ASAP (and replace master).

ernie9944 · ernie9944's Garage

Check under the MC reservoir the grommetts migth be gone,happen to me had the same problem ( easy fix).

Mark944na86 · 12-01-2009, 04:20 AM

Ernie nails it -- one split grommet. And yes, was an easy fix. Thanks guys.