ATE Calipers

[davidpdx]

   Here is a letter that was sent into the Airmail magazine. Not sure how I feel about using standard O-rings in place of metric but I have never had to find metric ones. I have this caliper on my 1984. I am thinking that it must be a replacement. Any input on if this would be a good rebuild if I ever need it? Hope I got these sized so you can read them.  

[Session101]

Choosing not to rebuild mine, but if you are asking about the rebuild, i hear the rebuild parts from BMW are $115. I was just looking at what it would cost to rebuild, and the seals are around $45 from motobins. I would imagine it wouldn't be hard to find metric seals seems how the rest of the world is on the metric system except US.

[montmil]

Note the author of this article, David.

Mike Valenti, a long-time member of this forum, is a well respected faculty member of the BMW College of Knowledge and has even been shanghaied by The Snowbum to produce some extensive Airhead tech articles.

Most everyone will tell you that Mike's knowledge is golden. As for me, what Mike says has always been most excellent advice

Show of hands... How many of us have benefited from the Sandy Eggo man's help? I'm a multiple winner myself.

BTW, when you get down to this small size of an o-ring, it's almost impossible to detect any size difference; especially when it's going to be clamped between the caliper pieces.

[Barry]

Show of hands... How many of us have benefited from the Sandy Eggo man's help? I'm a multiple winner myself.  

I'll have to shrink it before I can read it but if it was written by MikeV it will undoubtedly be of the very highest quality.

[disco51]

I rebuilt mine using said o-ring from Mr. Valenti himself.  He was extremely helpful when I went through the process with a couple of emails exchanged back and forth.
No leak after about 2-3 months and 1000 miles.  I'm satisfied it's a good fit.  I have 2 extra if someone out there wants one... just PM me.

[Mike V]

Dave,

I have a high level of confidence in the after market o-rings obtained for the application of the ATE' calipers as noted in the article.  Mine have been serving me well with no leaks or problems.  I have a few extra in my shop I'm happy to mail out to you if you like.  Send me your address by PM and I'll try to get them out to you.  As with everything - it's your decision based on your own research and personal preference.

Thanks for the very kind words guys, not sure I'm worthy of the accolades.  Just a passionate hobbyist who takes helping the forum seriously, and happy to return the favor for all the help you've given me.

-Mike V.

[Bob_Roller]

A&S BMW lists the ATE rebuild kit for $42.80 for one caliper .

The kit has 2 piston seals and 2 dust boots .

[montmil]

A&S BMW lists the ATE rebuild kit for $42.80 for one caliper .

The kit has 2 piston seals and 2 dust boots .

But no O-rings.

[vontresc]

And no replacement pistons either...