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  #1  
Old 06-04-2010, 12:59 PM
79Mercy's Avatar
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Vacuum pump& brake Booster question

This morning i noticed that my brake pedal was more firm than usual. Then when i went to turn off the car it took about 4 seconds for it stumble and shut off. I thought there was a vacuum leak somewhere in the system so I just capped off the vacuum nipple that sends vacuum to all the accessories this morning. My brakes were still hard, but a bit better than before.

Well when i had more time this afternoon I saw that the vent line on the vacuum pump was full of oil, I disconnected it and ran the motor and some oil sprayed out. Ok so the diaphragm in the pump needs to be replaced.

What doesn't make sense to me is, why are my brakes so firm? The pedal goes in like normal for about a inch and half and then its like hard as a rock. Could the vacuum pump have ruined my brake booster.

The vacuum pump is still putting out some vacuum but I guess not as much as before.....

Any ideas? Thanks

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #2  
Old 06-04-2010, 01:18 PM
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If there is reduced Vacuum you Brake Booster has reduced power to do the job and that willl make the Braking effort harder.

I doubt if Engine Oil made it all the way to your Brake Booster. But, you could unscrew the vacuum tubing connection at the Brake Booster and see if there is Oil. Or, you could loosen the Master Cylinder retaining Nuts and scoot the Master Cylinder forward a little and see if there is Oil in the Brake booster.
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Old 06-04-2010, 01:39 PM
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Quote:
Originally Posted by Diesel911 View Post
If there is reduced Vacuum you Brake Booster has reduced power to do the job and that willl make the Braking effort harder.

I doubt if Engine Oil made it all the way to your Brake Booster. But, you could unscrew the vacuum tubing connection at the Brake Booster and see if there is Oil. Or, you could loosen the Master Cylinder retaining Nuts and scoot the Master Cylinder forward a little and see if there is Oil in the Brake booster.
qft
It seemed any oil that manged to get where it didn't belong found its way out my tailpipe.
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'76 240D 311K
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  #4  
Old 06-04-2010, 02:54 PM
79Mercy's Avatar
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Thanks. Im trying to find a vacuum pump diaphragm here in Jacksonville FL but it seems there aren't any
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #5  
Old 06-04-2010, 03:42 PM
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Join Date: Jan 2002
Posts: 18,350
It is possible to get by without it for a while if you are willing to use both feet on the brakes if necessary. FastLane should be able to get you a diaphragm in a few days.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #6  
Old 06-04-2010, 09:02 PM
79Mercy's Avatar
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Location: Florida
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Well all is well. I contacted a old mechanic friend here in town and he had a old OEM Mercedes diaphragm kit on the self. So I pulled out the old one and sure enough it had a split in it.

I think it cracked because the last person to rebuild it installed the diaphragm backwards.

I had to take apart the head and clean out all the oil inside.

Here are some pics:

Gotta love that OEM Mercedes package




__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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