B2 Brake Band-Auto Transmission-replacement

[PC-85-928S]

has anyone ever done a B2 Brake band Piston replacement on a 1985 928S US, Auto?
I was wondering if this could be the cause of my 1st gear slippage.

where do you get a replacement?

[153bigblock]

Originally Posted by PC-85-928S

has anyone ever done a B2 Brake band Piston replacement on a 1985 928S US, Auto?
I was wondering if this could be the cause of my 1st gear slippage.

where do you get a replacement?

I also replied to your thread over on RL. I have done this on my Mercedes Benz C Class with the help of info I received on the 928 boards. I got my B2 Piston and thrust pins from the MB dealer, but I believe Roger at 928srus sells the 928 specific part. You will probably need to go to a MB dealer to get the thrust pin however. Pm me your email and I can send you all of the info you will need to complete the job.

From the MB 722.xxx trans work shop manual on trouble shooting:

Transmission Slips When Starting Off In 1st Or 2nd (Reverse
Is Okay)
Band B-2 shift valve sticking. Band B-2 piston worn or
damaged. Band B-2 adjusted incorrectly or worn or damaged. Adjust
brake band B-2 by installing a longer thrust pin (if necessary). If
transmission operates properly with selector lever in "2", but not in
"3" or "D" position, one-way clutch may be slipping.

[MPDano]

Originally Posted by 153bigblock

I also replied to your thread over on RL. I have done this on my Mercedes Benz C Class with the help of info I received on the 928 boards. I got my B2 Piston and thrust pins from the MB dealer, but I believe Roger at 928srus sells the 928 specific part. You will probably need to go to a MB dealer to get the thrust pin however. Pm me your email and I can send you all of the info you will need to complete the job.

From the MB 722.xxx trans work shop manual on trouble shooting:

Transmission Slips When Starting Off In 1st Or 2nd (Reverse
Is Okay)
Band B-2 shift valve sticking. Band B-2 piston worn or
damaged. Band B-2 adjusted incorrectly or worn or damaged. Adjust
brake band B-2 by installing a longer thrust pin (if necessary). If
transmission operates properly with selector lever in "2", but not in
"3" or "D" position, one-way clutch may be slipping.

Great post. Very informative. Also, a great post to add here:

**MOST Common 928 Issues AND Fixes**

[153bigblock]

Originally Posted by MPDano

Great post. Very informative. Also, a great post to add here:

**MOST Common 928 Issues AND Fixes**

Well, I just cut and paste it from the MB Trans WSM, but thanks Leo. Is it cool for me to link to any of the trans docs or is that a licensing no no for Pelican?

[MPDano]

Originally Posted by 153bigblock

Well, I just cut and paste it from the MB Trans WSM, but thanks Leo. Is it cool for me to link to any of the trans docs or is that a licensing no no for Pelican?

Can't really answer that one Mike. If it's not an illegal copy, then why not. I know that they just frown on anything in direct competition with their selling of "new" parts and products.

[153bigblock]

Done.

[153bigblock]

PC, emails replied with attachments.