I-BMW.com I-BMW.com

Welcome to the I-BMW.com forums! - You're currently viewing as a limited access guest. By joining our free member supported community, you'll gain access to post/ reply, communicate privately with other members (PM), or globally via "real time chat", respond to polls, upload photos, post classifieds etc. Membership is fast so, Register @ the Ultimate Sport Touring Portal!
Should you not receive an email with activation link, check your SPAM settings or please contact us and include the ID/ email address you registered with.

Go Back   I-BMW.com > BMW K-1200 Series Motorcycles > K1200GT-Slant 4 Version > "K12GT" Gen. Discussions
User Name
Home Register Gallery Classifieds FAQ Members List Calendar Donate Mark Forums Read

"K12GT" Gen. Discussions All about the bike

Vendor Sign Up | Want to see your name in neon blue? | Want a neat reflective sticker for your ride?!

Thread Tools.. Display Modes
Old 05-27-2018, 11:56 AM
PerpetualNewbie PerpetualNewbie is offline
Entering the on-ramp
Post: 2 Thanks: 1
Thanked 0 Times in 0 Posts
Join Date: May 2018
Location: MSP, MN US
Please help ID this brake piston?

Greetings oh wise-riders,
My 08 K1200GT's brake-handle has taken to collapsing all the way down. First change was to replace the piston, since they don't sell the seals anymore.

But lo and behold: my piston and master cylinder are nowhere to be found on any fiche. The cast-in part number is <32 72> 7 699 997 (I've added the <prefix>.) The slotted piston is nowhere to be found in anything K, or R, 2000-2010 as far as I can tell by trolling the Max BMW parts fiche. I'd be eternally grateful if you could ID it before I go down the dark road of hoping an EBay replacement will work.
Attached Images
File Type: jpg IMG_0208.jpg (15.8 KB, 12 views)
File Type: jpg IMG_0209.jpg (7.5 KB, 7 views)
File Type: jpg IMG_0210.jpg (5.8 KB, 31 views)
Reply With Quote
Old 05-28-2018, 11:53 AM
Herb's Avatar
Herb Herb is online now
Site Contributor
Post: 2,543 Thanks: 9
Thanked 416 Times in 309 Posts
Join Date: Feb 2006
Location: Huntsville, AL USA
Re: Please help ID this brake piston?

https://shop.maxbmw.com/fiche/Diagra...8&rnd=07242017 Look at parts diagram #32_1746

Above shows what should be in your 08 GT brake handle assembly. Some earlier models (R1100R) show a small screw in the brake housing that could engage a antirotation slot.

Simply call MAX parts, they are always glad to help.
Reply With Quote
Old 05-28-2018, 01:20 PM
PerpetualNewbie PerpetualNewbie is offline
Entering the on-ramp
Post: 2 Thanks: 1
Thanked 0 Times in 0 Posts
Join Date: May 2018
Location: MSP, MN US
Re: Please help ID this brake piston?

I'm working with my local dealer (Richfield BMW) because they deserve the patronage: Josh (parts) discovered just how weird this master cylinder is. The owner is getting involved, consulting some insiders he knows.

The slot is not an "anti-rotation" slot, it's the retainer. There's no circlip at the end of the cylinder, that short rod goes through the cylinder and piston, and is held in place from above by the star-clip on a cast post. This is the oddest master cylinder I've seen having trolled R's & K's +/-5 years on MAXBMW's parts fiche.

I'm gun-shy about buying an ebay-special for fear of ending up right where I am now: a piston that cannot be replaced/refreshed. So I'm waiting for Josh+boss to see what they come up with. I was hoping here for some data regarding what I have to avoid obvious toe-stubbing.
Reply With Quote

Thread Tools..
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads (a database pull of similar subject matter)
Thread Thread Starter Forum Replies Last Post
Brake Failure Warning Indication RustyJC "K12GT" Technical Q&A 38 02-28-2013 01:29 PM
2010 K1300GT, about 28,000 Miles, Rear Brake Failure. edh "K13GT" Technical Q&A 35 11-17-2011 09:58 AM
Brake modulator staying on? EvilGenius "K12S/KR" Technical Q&A 7 10-08-2011 05:38 PM
Changing front and rear brake pads on 07 k1200gt tundra61 "K12GT" Technical Q&A 24 03-15-2011 06:16 AM
Track session, brake failed at 110mph on my 07GT. Why? Charles-Henri Jacques "K12GT" Technical Q&A 40 09-23-2009 12:24 AM

All times are GMT -4. The time now is 07:02 PM.

I-BMW.com is via vBulletin Version 3.5.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 1998 - 2018, I-BMW.com LLC .
Page generated in 0.43986 seconds with 16 queries