[BigChief]

My brake booster pump died, so I'm getting a workout on my right calve muscle to work the brake pedal. Brought my 2013 ED in to the dealer and they said it would be $500 to replace the pump. I'm seeing piles of new pumps on eBay for $62:


https://www.ebay.com/itm/382923911050


For that price I figure it can't hurt to pop the hood and try it myself (and check the fuse too, I forgot to do that before I left it at dealer). Should that pump be compatible? I don't trust the eBay compatibility checker when I know the ED uses some far different parts than the ICE version.

 

[OliverB]

Not having a smart ED I don’t have direct knowledge but, since there isn’t vacuum from an ICE motor, I would think the booster is not the same as found in ICE cars.

 

[door2416]

I looked up brake booster on Rock auto site and they are using the same part number for both ICE and ED. Disregard this I did't read that it was for a pump.

 

[Yinzer]

By "booster pump" you mean the vacuum pump - the thing that periodically goes "brrrrrrrrrrrrrt" right? That would be unique to the ED. "Brake booster" could also mean the diaphragm unit that provides the power assist to the master cylinder. That would probably be the same as the IC engine Smart.

BTW - none of those e-bay items in your link are for a Smart ED.

But note that the booster failure is likely another case of the wire harness chafing problem in the right quarter panel area (the booster pump is also mounted in a hard to get to location in this area) so you might only need to mend a wire. Check that first! Go here:

https://www.smartcarofamerica.com/forums/f170/brake-wiring-harness-chafing-151488/

 

[jenkinskg]

Have you fully checked pump outside of car?
What broke?
motor, pump seals?

There are many ed parts around, but I would repair it.
Also look for wire chaffing issues behind pass seat on side.
Seems to affect whatever wire get cut

 

[BigChief]

I'm grabbing my car back from the dealer to have a look and will let everyone know. Thank you very much for the heads up on the wire chafing thread!

 

[jenkinskg]

saw this

https://www.evwest.com/catalog/prod...ucts_id=336&osCsid=doqlnco4229junibf7adi102k6

 

[Yinzer]

OK, so that UP28 does seem to be the correct part. It's still probably not a bad pump though.

 

[BigChief]

I tough-talked the MB dealer into giving me a free estimate (they wanted $170 to take a look, screw that). They took a look and said that they need to replace "the fuses and fuse box" for $500 and that the pump was fine. Someone there let slip that he was aware of the issue with wires abrading against the frame. They did not point out where precisely the issue was. I checked fuse #9 so far (brake pump) and it wasn't blown.



I retrieved the car without having them perform any repairs yet.


I removed the back right panel as in the wire chafing thread, but I don't see any chafing on the harnesses in that area at all: https://www.smartcarofamerica.com/forums/f170/brake-wiring-harness-chafing-151488/


Not sure where to go from here. I'm thinking I'll just have some non-MB workshop troubleshoot the wiring. I don't want to give them the satisfaction of paying to repair something they should be fixing free with a recall.

 

[Yinzer]

By "fuses and fuse box" I assume they mean the SAM?

You need to get a OBD scanner for the ED to begin with,

 

[Dbarr]

The fuse for the smart fortwo "2014" is located in the compartment with the battery under the passenger floorboard.