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Old 10-10-2009, 06:24 PM
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Join Date: Oct 2009
Posts: 2
Brake Bleeding problem on 1981 380SL

I have read the threads on brake bleeding issues with the 380 sl. I have made the pressure bleeder ( works great) and set to work. Immediately I had brake fluid coming out of what appears to be a low fluid indicator switch on the top left of the reservoir. I efficiently emptied about a quart of fluid on the garage floor. I have a maintenance manual, read it and do not see any reference to this issue. I am suspecting i might have a damaged master cylinder. My problems started after replacing a stuck wheel brake cylinder, I have not been able to get it bleed properly. Any suggestions would be appreciated.

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Old 10-11-2009, 02:18 AM
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Join Date: Jul 2009
Posts: 254
What pressure are you using with the bleeder? Perhaps it's just the level sender that's bad and the MC is okay. Did you try to manually bleed the brakes (pumping the pedal) before you made the bleeder? If so you may have damaged the MC piston seals by pushing the pedal too far.
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Old 10-11-2009, 02:27 AM
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Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,243
Your problem is that the rubber caps on the level indicator switches are dried out and not sealing well. Replace the rubber caps before trying to bleed.

Part number is: 000-431-90-87


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Old 10-11-2009, 09:41 AM
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Join Date: Oct 2009
Posts: 2
Thank you, definitely bad caps

when I went to check them they came off in pieces. Thank you for providing the part number as well. I will try this next.

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