Sounds like the seals in the master cylinder. Older seals and slamming on the brakes MAY have caused them to start leaking pressure back into the reservoir, which allows the pedal to drop. If master cylinder is original I would buy a new one; they can be rebuilt but are usually pitted from years of moisture condensation. Bill in
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Sent: Friday, June 13, 2014 3:20 PM
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Subject: [diesel_mercedes] 1984 300SD - Sylvia's got squishy brakes...
Just started today, pump the pedal, brakes quickly and strong with boost, hold at idle and eventually goes to the floor but holds. Pump and is back up top, slowly fades to floor. Not good. Seems like fluid pressure related not vac - checked fluid reservoir and seemed ok, but will keep an eye on. Afraid it may be in master or booster. Any / all suggestions welcome - my son slammed on the brakes a few times today by mistake while he was driving an wondering if it's related. Too late if so, but one more piece of data. Thx in advance, wish me luck :-)
Posted by: <corvallis@peoplepc.com>
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