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RE: R1100GS Master Cylinder
- Subject: RE: R1100GS Master Cylinder
- From: RoboBoxer <roboboxr@xxxxxxxxxxxxx>
- Date: Sat, 08 Jan 2005 21:14:31 -0500
The rebuild kit is available according to the on-line parts fiche at Max
BMW. I use only Castrol LMA. What you say makes sense about the crystallized
brake fluid. I think that is what I am seeing. Looks like my best bet is to
replace the piston/seal assembly and put on a new rubber boot.
Paul T. Donoghue
Highlands Technologies, Inc.
|[mailto:owner-oilheads@xxxxxxxxx] On Behalf Of Tpcutter@xxxxxxx
|Sent: Saturday, January 08, 2005 7:48 PM
|Subject: Re: R1100GS Master Cylinder
|In a message dated 1/8/05 5:34:33 PM Eastern Standard Time,
|<<I have been having reoccurring problems with the front
|brake lever hanging up. Upon disassembly of the front brake
|lever, and removing the rubber boot on the master cylinder,
|some type of corrosion is found. I've removed the master
|cylinder piston twice and cleaned up the bore. I've cleaned
|the piston and seals, and re-installed using the original
|components. The corrosion came back once. I'm not sure if I
|just need a new rubber boot to seal better or should go ahead
|and replace the piston and seals as well as the rubber boot?
|Anyone experience this type of problem before?>>
|I think you will have trouble getting a rebuild kit for that
|master cylinder. I know that some are unavailable.
|What kind of brake fluid are you using? If you are using
|DOT5, that's your trouble. Use Castrol GT-LMA (Low Moisture
|Absorbing) DOT 3/4 brake fluid and change it annually. This
|will eliminate the corrosion problem pretty well.
|If the seals are leaking, the buildup you are seeing is not
|corrosion per se, just dried up, crystallized brake fluid.
|The leak is a warning sign to fix the trouble before you lose