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Originally Posted by sailor15015
BHD, could you please explain this to me in a little more detail? This caught my attention because I have also had to top off the reservoir twice in the year I've owned the car. Sorry not trying to hijack the thread.
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From when I bought my car (W116) 3 years ago I needed to put fluid in ever few months...not a lot just a little.well last year my brakes got intermittantly hard and I finally noticed the slowly sinking pedal symptom sitting at a long light. I could never find ANYTHING that was even damp with fluid anywhere.
When I got a replacement master cylinder adn went to replace it I found the booster 1/2 full adn I mean up to the center hole full of brake fluid.
Now since that does not do good things to the booster I went out and got a remanufactured booster also... Which via a call to Partsamerica.com I found out they were getting one for a tidy price of $114 exchange....junkyards wanted $99 for one.
What happens is effectivly it reduces your vacume capacity and resulting brake assist. The Master cylinder rear seal had been slowly leaking for several years to drink that much fluid.
As pads wear its normal for the level to drop...but not as fast or as much as I was experienceing.