Vacuum Pump Failure, W115 240D - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 06-25-2005, 07:06 AM Thread Starter
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Date registered: Jan 2005
Vehicle: 1976 240D
Location: South East Michigan
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Vacuum Pump Failure, W115 240D

I replaced the vacuum pump diaphragm in my 1976 240D about 5000 miles ago. Just yesterday I nearly ran a stop sign when the brake pedal went to the floor. I pulled the pump apart just now and sure enough there's a tear in the diaphragm, right along the line of the large washer on the vacuum side. What would cause the diaphragm to fail so soon? What orientation should the check valves be in? Could I have put them in backwards? There might be a vacuum leak somewhere in the car since the door locks do not work, could that cause the diaphragm to fail so soon?

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post #2 of 2 (permalink) Old 06-25-2005, 02:10 PM
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RE: Vacuum Pump Failure, W115 240D

Check for info -- hope this helps.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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