Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: piddler on July 01, 2019, 23:47:53

Title: brake master cylinder leak
Post by: piddler on July 01, 2019, 23:47:53

There is a small hole at the bottom of the base of the master cylinder that has been dripping oil. We noticed the oil on the garage floor and traced it to the aforementioned leak. The oil smells a little like brake fluid but does not have a strong smell. It drips while the car is sitting.

Is this telling me I have a problem with the master cylinder or the booster?

Title: Re: brake master cylinder leak
Post by: teahead on July 02, 2019, 00:47:06

most likely. 

Losing any noticeable amt of brake fluid?

Title: Re: brake master cylinder leak
Post by: piddler on July 02, 2019, 10:42:47

We don't drive the car a lot but the reservoir is nearly full.

Title: Re: brake master cylinder leak
Post by: Charles 230SL on July 02, 2019, 12:56:45

Quote from: piddler on July 01, 2019, 23:47:53

Is this telling me I have a problem with the master cylinder or the booster?

Hi Piddler, I had this problem several years ago with my 230's master cylinder. 
Your master cylinder is leaking fluid at the plunger-end where it mounts to the brake booster. The fluid could eventually find it's way into your booster and ruin the front diaphragm.  The master cylinder will need to be either replaced or rebuilt. There's a number of threads and a wealth of info on this forum about removing and replacing the master cylinder. take care, charles

https://www.sl113.org/forums/index.php?topic=29116.msg210549#msg210549