cscheat

hello,

i have problems with a W211 with SBC ! after serious checking i found that the SBC Accumulator (some call it reservoir) is faulty.... so is it advice to change the Accumulator only or THE WHOLE SBC HYDRAULIC UNIT ???

thanks !

Benz-O-Rama

I wanna say that most of the parts that make up our SBC system has a 10 year warranty. You should call your local dealer to confirm but I think it's 10 years. I'm sure somebody on here that's smarter than me will tell you for certain.

csumt76

Something like that.... and the accumulator is available seperately. All you have to do is deactivate the system, unscrew the resevoir, pop the new one on and bleed it.

Diesel Benz

Other W211 owners might be interested knowing when this happened to your car, I mean what mileage do you have and which MY is it?

dunnman99

All,

Just had 2 issues with my 2003 M/B E500, SBC system.

1st..CODE--c249f, and the description is "fault code shows that operating time of hydraulic unit is exceeded."

O.k....well I am in Guam, I have 100% of my service records and brake servicing...No M/B dealer or service center within 3000 miles.

M/B unexpectedly will not ship my car to Hawaii to the nearest M/B dealer at no cost to me to replace my SBC unit...LoL

I am able to get a new (slightly used unit) (20% expected cost) and have my unit replaced. Good to go.

2nd--Sorry don't remember the code...Get the White Brake Visit Service center message..Oh great SBC crapped out..Nope, Accumulator bad- -Replace.

So it turns out my slightly used SBC unit had a high pressure accumulator with a ready to fail check valve in it. It should be holding 150 BAR, and mine only "accumulates" 70 BAR. per my STAR diag testing.

So I have a new accumulator on order, should be in this week. I will power down the SBC via my STAR laptop, bleed the system and "simply" unthread the old accumulator and replace it.

Any tips????

SBC expired at 115,000 miles
Accumulator at 10,000 miles on the previous SBC

I just flushed and filled my brake system with ATE 706302 Original Super Blue Racing DOT 4 Brake Fluid. If anyone has ANY tips on the brake system High pressure accumulator replacement and things to expect...I would greatly appreciate it.

vettdvr

My only tip is do as I did,, sell the car with SBC and buy one without .

Changing the accumulator will be your best 2nd choice. I do understand your limitations in Guam after being in Okinawa.

dunnman99

So I had the time a week ago. Hooked up the Star computer laptop, powered down the SBC system, changed out the Accumulator, powered it back up.

Ran through purging sequence, system bleed, pre-tensioning and testing.

System back to 100%, accumulator / resevior can be easily replaced as long as you have a Star system available.

wishihadahorse

I have a similar problem ... quite pissed, really. Can you give me a round figure regarding price of the g^& dUJ:I:" accumulator?

dunnman99

The cost of the part is around ~$400 depending on where you find it.

You need to use the DAS unit or Xentry system in order to bleed the system down to be able to replace the accumulator. A simple replacement , the dealer will charge you around ~$1500 to replace it.

Good luck.

SorryAboutThat

Wow, $400 sounds like a great deal!

Cost of the SBC pressure reservoir, or "accumulator," was US$740.25 from the dealership. Total cost for the replacement job at the dealer was almost US$1400, which included replacing the SBC supply line with an updated version. The updated suction supply line (US$134) was supposed to make the SBC quiet...didn't really do much IMO.

wishihadahorse

It's problems like this that make owning what is a wonderful vehicle a real disaster. The SOBs who engineered this system ought to be taken out back and *&HF!!

kjkyzar

on the other hand, while this is an old thread, on my 2004 E-500, the SBC WAS replaced under Mercedes 10 year warranty. for free!!

SorryAboutThat

Was the pressure reservoir/accumulator also replaced under the sbc hydraulic unit warranty? My understanding is that the 10 year warranty only covers the hydraulic unit itself and not the other components in the sbc system. Any idea if your sbc came with a new pressure reservoir? My guess would be that they used your old pressure reservoir and installed it on your new sbc hydro unit...

kjkyzar

Well, you got me on that one. My understanding was everything, but, next time I am at the car, I will pop the hood and look.

ajohn_son

When deactivating the system does that depressurize the reservoir/accumulator?

dhuddleson

Yes, using the proper diagnostic tool to Deactivate the SBC system depressurizes and allows you to remove/replace the accumulator.

ajohn_son

By letting the car system go to sleep and deactivate that way, without the use of SDS.... does that depressurize the reservoir/accumulator? Thats the way I change the brakes & rotor's, but now I have to change the reservoir.

timannnn

For the replacement of the accumulator/reservoir I would recommend using an independent. My local independent charged me $100 to replace it. I supplied the new part though as they wanted almost double for what I found it for. The accumulator does not depressurize. The unit itself is pressurized and usually the diaphragm fails releasing the charge inside.