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Old 05-23-2008, 11:11 PM
dscolopendra's Avatar
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Join Date: May 2008
Location: Houston,Texas
Posts: 10
Unhappy 1985 300d brake trouble help


Today I was driving my 1985 300d on the freeway for arround 15 minutes at arround 70mph then I exited the freeway and when I was on the freeder road and the light on the intersection is red I begun stepping on the brakes but there is something wrong with my breaks it will not stop . I have to step on the brakes 5 times for the brakes to like stop seems like the is no pressure on the brake booster. Then I just pulled over to the strip mall and parked my car. I called my office mate to pick me up to get back to work. this was about 1:00pm. Then I have my wife pick me up arround 5:00pm , 3 hours latter to go back to my mercedes to have it towed. When I was there I started the car and drive it a little and the brakes seems ok again. I checked if there is vacuum leak on the line that connects to the brake booster but there are no vacuum leak either, The brake fluid is full. There is no brake fluid leak on the calipers either. My question is: Is this a brake booster failure of is this a brake master cylinder failure or both. Please help.

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Old 05-24-2008, 12:31 AM
tobybul's Avatar
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Join Date: Sep 2005
Location: West Michigan
Posts: 2,076
sounds like the mc went south....
the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth...
2007 Honda Accord EX
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85 300D - Found Another Home
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Old 05-24-2008, 12:48 AM
dscolopendra's Avatar
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Join Date: May 2008
Location: Houston,Texas
Posts: 10
Removal of the fluid reservoir from the master cylinder?

How do I remove the brake fluid reservoir from the master cylinder? It doesnt seem to have any bolt that secures it, can I just pull it?
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Old 05-24-2008, 01:06 AM
dieseldiehard's Avatar
Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,146
the reservoir plugs into tight fitting rubber bushings/seals. It has to be pried off using a large screwdriver or similar lever, hopefully while still mounted on the booster

to remove the master cylinder there are two bolts on the back attaching it to the Booster. before loosening them you want to bleed off or suck out the fluid in the reservoir then disconnect the rigid brake lines from the MC, taking care not to bend them and preferably using a line wrench on the fittings (not mandatory, if you don't have a line wrench a regular wrench is ok).
'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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