bfellows

Just thought i'd post this one for reference. This was the start of my gearbox woes 12 months ago.......

Roger

That's what mine looked like. So far, I've determined that MB has redesigned that part 4 times. The version that I put looked more "machined" vs. cast.

Check to see if you have the metal sleve or the plastic sleve that the top portion of the piston slides into. Some say that the metal to metal contact caused the failure.

Regards,
Roger

mark kibort

I give. what the heck is that?

RngTrtl

what is it supposed to look like?

Roger

That's the b2 piston that "pushes" the b2 brake band in an auto trans. It's a weak point in the MB transmission.

A broken b2 piston results in a "slippage" in the gears. Over time, the slippage becomes so bad that it no longer allows the car to move forward.

http://img160.exs.cx/img160/9086/dsc02370a1wy.jpg

Here's more information: http://www.mercedesshop.com/shopforu...d.php?t=109035

Regards,
Roger

Landseer

Bert, please tell us more about the symptoms you encountered and the fix.

SeanR

I can't find the B2 pics I took last year, but the end piece looks like that, among the other 30 parts that came out with it. If you've got the trans in the car, ensure you have EVERYTHING out of there before you put the new one in.

bfellows

Symptoms were all working fine one minute, then zero drive in first and second gear the next, but reverse was fine. The fix - in my case full gearbox rebuild due to cooked brake bands, but usually just fit new piston.

RyanPerrella

its from an automatic, i trust youve never seen one of those before lol

a year ago i wouldnt have known what the hell that was either

Phil Silano

Here is a picture of an old style B2 piston.

Attachment 322382

Mrmerlin

I wonder how much metal is cruising through the trans lines and coolers as well as the valve body, also the torque converter and front pump??

bfellows

Like I said, cost me a full rebuild in the end including converter, although all pieces were accounted for.