After removing the B2 Piston how can you detect a broken B2 Band? - PeachParts Mercedes-Benz Forum

Diesel911 · #1 01-31-2015, 03:29 PM

After removing the B2 Piston what method/s can you use to detect a broken B2 Band?

Stretch · #2 01-31-2015, 03:42 PM

Quote:

Originally Posted by Diesel911

After removing the B2 Piston what method/s can you use to detect a broken B2 Band?

You should be able to push the brake band onto the brake drum and feel it grip and when you release it kind of springs back (a tiny bit) - if it slides or flops about then the band is probably broken - there isn't all that much movement sideways for these bands...

...it is a bit difficult to explain in words though...

Diesel911 · #3 01-31-2015, 09:36 PM

Quote:

Originally Posted by Stretch

You should be able to push the brake band onto the brake drum and feel it grip and when you release it kind of springs back (a tiny bit) - if it slides or flops about then the band is probably broken - there isn't all that much movement sideways for these bands...

...it is a bit difficult to explain in words though...

Thanks. That is what I thought but it has been a long time since I pushed on mine I cannot remember what reaction I got.

Stretch · #4 02-01-2015, 03:57 AM

Quote:

Originally Posted by Diesel911

Thanks. That is what I thought but it has been a long time since I pushed on mine I cannot remember what reaction I got.

I was thinking I could make a video of a good one for you - but then I remembered your dial up internet connection and thought it might not be something you'd be able to see...

homepagz · #5 02-01-2015, 07:58 AM

As I'm dealing with this exact issue myself - I'd love to see a video on it.

Also - from where and what direction should pressure be applied to the brake band?

Thanks,

-John

Stretch · #6 02-01-2015, 09:08 AM

Quote:

Originally Posted by homepagz

As I'm dealing with this exact issue myself - I'd love to see a video on it.

Also - from where and what direction should pressure be applied to the brake band?

Thanks,

-John

On thinking about this (and the cold horror of having to dig something out of the depths of my garage in the middle of winter) I reckon perhaps a video isn't going to be forthcoming until spring has sprung!

To help in the mean time I reckon the safest way to check for a broken B2 band is to remove the valve body as well as the piston.

Here's where the B2 is fitted on a 722.3(03)

722.303 in bits photo shoot

And here's the little bugger on the 722.1(18)

722.118 Automatic transmission rebuild (Monster DIY)

In both situations the gasket between valve body and casing should be replaced. (If I remember correctly several people have reported weird **** going on with strange internal leaks when the gasket has not been renewed)