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Old 12 Feb 2005
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Join Date: Aug 2001
Location: B.C. Canada
Posts: 214
Hi Kevin, I'm in Revelstoke.
I have seen pics of your bike and it looks great.
Thanks for your offer I will keep it in mind.
I am really not sure what I need for the G/S yet...but I will probably manufacture most of it myself.
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Old 27 Apr 2005
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Veteran HUBBer
Join Date: Aug 2001
Location: B.C. Canada
Posts: 214
I finally got around to fixing the rear brake cam leak...
Very simple really.
Drained the final drive oil.
Wheel and brake shoes off.
Removed linkage arm on the other side, and tapped shaft out.
Cleaned everything well.
There are seven grooves in the shaft, only four are for O-rings(they are deeper). Two per side, about a cm apart.
Matched the O-ring size with nitrile(industrial hydraulic) o-rings.
It is very difficult to get the new O-rings over the splined end of the shaft and other rig grooves without tearing them. So I made a tapered "roll-on" jig out of a plastic caulking tube tip and rolled fairly heavy paper around the shaft over the other o-ring grooves. Then rolled each succesive o-ring into it's groove.
Re-assembled and filled oil.
working well so far.
cheers, Peter
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Old 27 Apr 2005
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Join Date: Sep 2002
Location: Tomahawk,Wisconsin
Posts: 220
Hola Amigos,
I have a 1983R80ST which has the same rear drive as the G/S. Mileage is 175K. My brake cam started to leak at 75K miles so I changed the o-rings. Leaked again at 100K miles and then the interval of the leaking just got shorter. This was a real problen because I have been in Central and S. America since October and half the time I didnt have a rear brake cause it was slimed with oil. I periodicially cleaned the drum and shoes with gas, changed the orings(not so easy to find sometimes) and kept riding. Now I am looking at changing the 2 bushing system I have for the tube system and hope it can be done.
As the bushings and the cam wear, it is impossible to keep the o-ring from wearing out very quickly. At least the oily brake shoes can be easily cleaned. This suprised me but I did it at least 6 times. Maybe the final word hasnt been written yet on this subject. Bill.
Hola Amigos,
Since I wrote this message I have had the course on the bastard o-rings. I rode to Calgary headed for Alaska and had
Bob,s BMW in Jessup, MD ship up two bushings and the tube listed as the correct part numbers for my machine. When they arrived they were not correct as they were too small in OD/ID. I will post the incorrect part numbers I was sent as soon as I can find them. The bushings came from Germany.
I had a stainless steel tube machined to fit my rear drive and brake cam to finially solve the problem. It took some doing but I got it installed correctly and finially no leaks. A $90 Canadian turned into a $450 job and I was bummed. I will not name the shop I used but be careful in Calgary with repairs. If you have leaks fix it right or pay the price I did. Make it a winter project and rebuild the rear drive at the same time and be done with it. Find someone with experience, tools, measuring equipment and parts to get it done right.
I can recommend Anderwerks in Calgary. Dave knows the bike and has parts. I also recommend this man. He is a great machinist and rides a BMW. In Calgary,
Neils Machine Shop
Stainless steel Neil
Tel no.403 275 8098
neil22@telus.net Bill.

[This message has been edited by Bill Shockley (edited 29 June 2005).]

[This message has been edited by Bill Shockley (edited 11 August 2005).]
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