I'm curious if anyone might know why the clutch master cylinder fluid changed to mineral oil. I need to utilize the clutch master cylinder (left) to actuate the front brakes and brake master cylinder to actuate the clutch due to a disability.
I've done this conversion on several Honda's (VFR, Valkyrie, Goldwing) successfully. I believe I can re-purpose a 1150 DOT 4 clutch master cylinder and modify cable lengths and fittings for use on a 2014 R 1200RT. Just asking for shared thoughts? Someone suggested it was simple done to be environmentally friendly but I think there may be more to it than that.
I'd like to communicate with BMW engineering but haven't a clue where to start. Thanks in advance for your responses.
Mineral Oil - Clutch Master Cylinder
Re: Mineral Oil - Clutch Master Cylinder
You need to contact your local BMW dealer. I'm sure they will point you in the right direction.
- David.
- Subscriber
- Posts: 8415
- Joined: Fri Nov 07, 2014 7:29 pm
- Location: North Yorkshire
- Bike Model and Year: R1200RT (Camhead) 2012
- Been liked: 409 times
Re: Mineral Oil - Clutch Master Cylinder
It looks like BMW changed the clutch to mineral oil because it is not hygroscopic, (i.e. does not absorb moisture), unlike brake fluid.JED wrote:I'm curious if anyone might know why the clutch master cylinder fluid changed to mineral oil.
It does not require changing (ever) and of course is non-corrosive if it happens to get on the paint.
- David.
- Subscriber
- Posts: 8415
- Joined: Fri Nov 07, 2014 7:29 pm
- Location: North Yorkshire
- Bike Model and Year: R1200RT (Camhead) 2012
- Been liked: 409 times
Re: Mineral Oil - Clutch Master Cylinder
Looking at the Service Schedules for the 1150's & 1200's, the clutch fluid required changing on the 1150, but not the 1200.JED wrote:I believe I can re-purpose a 1150 DOT 4 clutch master cylinder and modify cable lengths and fittings for use on a 2014 R 1200RT.
This may be when the change was made to mineral oil. The seals behave differently in brake fluid & mineral oil.
http://www.largiader.com/articles/mineral/
Found this thread on UKGSer, sounds like the same conversion you are wanting to do,
http://www.ukgser.com/forums/showthread ... T4-or-DOT5
Last edited by David. on Tue Feb 10, 2015 9:32 pm, edited 1 time in total.
Re: Mineral Oil - Clutch Master Cylinder
Dave,
Thanks for your response this is exactly the info. I was seeking. I am working with a BMW service shop but this is not a common issue that they would address so I'm attempting to help them with the research. The UKGSer threaded address the clutch slave cylinder seal issue with DOT 4 and the solution of utilizing mineral oil in the front brake master cylinder. Good stuff!
Thanks for your response this is exactly the info. I was seeking. I am working with a BMW service shop but this is not a common issue that they would address so I'm attempting to help them with the research. The UKGSer threaded address the clutch slave cylinder seal issue with DOT 4 and the solution of utilizing mineral oil in the front brake master cylinder. Good stuff!