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Brake booster pump dead

3876 Views 10 Replies 7 Participants Last post by  bowenrandy0, 
C
Hi every one I writing the first time hire , I have read perhaps all posts about this problem in this forum but can,t solve the problem .
I have 2014 ED , few days ago brakes become hard and on screen is showing brake malfunction . I checked errors and finded two :
1.The vacuum pump has malfunction - there is short circuit to ground .
2.The electric relay of vacuum pump has a malfunction - there is an open circuit .
May be some body from you had the same situation or have any thought .
I have a lot of spare part from ED with bad battery so I changed vacuum pump then engine computer ( beyond the passanger seat ) , fuse box , both relays + and -
, checked all wire : on engine , under carpet , under floor , checked brake swich and sensors - no resalt .
The bigest problem - in my country there is no Smart car dealers , is Dimler but they do not trade or make service to Smart car ( am in EU , 1000 km from
Berlin !!!! :( ) ,
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Vincent Rapide
The vacuum pump failed, actually its windings shorted to the frame according to the error reported. This caused the second error when the fuse/breaker blew.

So why did you go beyond the simple repair of (1) replacing the pump and (2) reset the relay?

If it ain't broke don't fix it.
--
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D
Did you clear the codes after replacing all those parts? Perhaps you solved the problem, but assumed you didn't because the codes still appear.
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C
Vincent Rapide said:
The vacuum pump failed, actually its windings shorted to the frame according to the error reported. This caused the second error when the fuse/breaker blew.

So why did you go beyond the simple repair of (1) replacing the pump and (2) reset the relay?

If it ain't broke don't fix it.
--
Click to expand...
thank you for responding , I do not checked resistance between +.- and ground becourse pump is on ruber bushing and thought can,t be shorted to the frame , I have chacked resistance existing and spare pump , thay are the same , all fuses where OK .
How I have to reset relay , by erasing error ? My friend who have diagnostic computer said that error automaticaly become inactive maybe he was wrong .
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DealMeIn said:
Did you clear the codes after replacing all those parts? Perhaps you solved the problem, but assumed you didn't because the codes still appear.
Click to expand...
now I will try it again with eraising codes
thank you for responding
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chirurgas said:
thank you for responding , I do not checked resistance between +.- and ground becourse pump is on ruber bushing and thought can,t be shorted to the frame , I have chacked resistance existing and spare pump , thay are the same , all fuses where OK .
How I have to reset relay , by erasing error ? My friend who have diagnostic computer said that error automaticaly become inactive maybe he was wrong .
Click to expand...
Just changed vacuum pump , checked errors this time I finded three errors

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this forum is DEAD like my vacuum pump
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smark
May I suggest you take you car to a automotive mechanic. It doesn’t need to be a smart one. They probably fix you car in a few minutes.

that your best bet. Good Luck.
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jennym
Hey, if you’re having a brake booster malfunction you can submit your report to Recalls | NHTSA and if enough vehicles submit they can trigger a recall for the booster and if you’ve repaired it, get reimbursement? I just submitted one today.
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Jmk2020
Pulling a real old topic :) Reading the post i would propose to check the wiring and relay which power the pump. There is even a special fuse direct located close to the 12V battery for this part and it is not routed via SAM. There could be a short if the wiring agains the chassis cause the blow of the fuse.
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bowenrandy0
Vincent Rapide said:
The vacuum pump failed, actually its windings shorted to the frame according to the error reported. This caused the second error when the fuse/breaker blew.

So why did you go beyond the simple repair of (1) replacing the pump and (2) reset the relay?

If it ain't broke don't fix it.
--
Click to expand...
is this easy to swap pumps
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