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Any difference between a brake and clutch master cylinder?

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0l0dom0l0
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Joined: 21 Oct 2009
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PostPosted: 20:11 - 21 Jan 2014    Post subject: Any difference between a brake and clutch master cylinder? Reply with quote
Buying a Brembo 19x18 off a friend. Just wondered if I could use this on the clutch side or brake side?
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Fizzer Thou
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PostPosted: 20:18 - 21 Jan 2014    Post subject: Reply with quote
Please tell me that this is a trick question Rolling Eyes
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0l0dom0l0
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PostPosted: 20:19 - 21 Jan 2014    Post subject: Reply with quote
Fizzer Thou wrote:
Please tell me that this is a trick question Rolling Eyes


No, why would it be?
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Bikes: 2007 Derbi GPR 50, 1998 Yamaha Fazer 600 (written off), 2002 Yamaha Fazer 600, 1994 CBR 600F, 2003 Triumph Daytona 600, Kawasaki ZX6R J1.....Current: 2006 Yamaha FZ6, 1998 Suzuki TL1000R and a Honda VFR 400 NC30.
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 20:33 - 21 Jan 2014    Post subject: Reply with quote
I too am curios as my KTM clutch and brake MC look identical, just switched round.
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Islander
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Joined: 05 Aug 2012
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PostPosted: 20:35 - 21 Jan 2014    Post subject: Reply with quote
0l0dom0l0 wrote:
Fizzer Thou wrote:
Please tell me that this is a trick question Rolling Eyes


No, why would it be?


Apart from them being handed? Razz
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0l0dom0l0
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PostPosted: 20:46 - 21 Jan 2014    Post subject: Reply with quote
Islander wrote:
Apart from them being handed? Razz


Embarassed
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CBT Passed: 30/08/2009, Theory Passed: 31/08/2010, Mod 1 Passed: 6/9/2010, Mod 2 Passed: 13/09/2010. Restriction ended 13/09/2012.

Bikes: 2007 Derbi GPR 50, 1998 Yamaha Fazer 600 (written off), 2002 Yamaha Fazer 600, 1994 CBR 600F, 2003 Triumph Daytona 600, Kawasaki ZX6R J1.....Current: 2006 Yamaha FZ6, 1998 Suzuki TL1000R and a Honda VFR 400 NC30.
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cb1rocket
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PostPosted: 01:48 - 22 Jan 2014    Post subject: Reply with quote
You just need to check the master cylinder is a compatible size. Brake mastercylinders are bigger iirc
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barrkel
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PostPosted: 02:19 - 22 Jan 2014    Post subject: Reply with quote
Apart from the handedness...

Hydraulic systems are levers as well as force transmitters. They use the relative areas of the pistons at either end as a force multiplier. Pushing a narrow piston is easier than pushing a big piston, since narrow pistons need move much less fluid for the same distance travelled. Thus brake master cylinders have small single pistons and the calipers have multiple big pistons. Force at the lever is multiplied when it gets to the pads. Correspondingly, lever movement is much larger than the pad movement.

So the application does matter. If the master cylinder piston size is very different from the designed original for the clutch, the clutch may end up very hard to pull with little lever travel for feathering (too big), or may require too much lever travel to go from fully engaged to fully disengaged (too small).
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Islander
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PostPosted: 10:16 - 22 Jan 2014    Post subject: Reply with quote
barrkel wrote:
Apart from the handedness...

Hydraulic systems are levers as well as force transmitters. They use the relative areas of the pistons at either end as a force multiplier. Pushing a narrow piston is easier than pushing a big piston, since narrow pistons need move much less fluid for the same distance travelled. Thus brake master cylinders have small single pistons and the calipers have multiple big pistons. Force at the lever is multiplied when it gets to the pads. Correspondingly, lever movement is much larger than the pad movement.

So the application does matter. If the master cylinder piston size is very different from the designed original for the clutch, the clutch may end up very hard to pull with little lever travel for feathering (too big), or may require too much lever travel to go from fully engaged to fully disengaged (too small).


That would have been my next point. Thumbs Up
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Old Thread Alert!

The last post was made 12 years, 8 days ago. Instead of replying here, would creating a new thread be more useful?
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