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Stupid question alert !

exdirtbiker

exdirtbiker

Forum Mentor
How bad would it be if someone put a 1/2" rear master cylinder on a bike that came with a 5/8" from the factory? ( keeping original caliper)

A: More pedal stroke required?
B: Little noticeable difference?
C: Soft pedal feel?
D: I'm a complete idiot for considering it?


WHY would I do this? It'l save me about $100.
 
Suzuki used a 14mm bore master on the rear of the 1000G. Moving to a 1/2" bore master will add a little pedal lever stroke and maybe a little softer feel, but the braking force will be higher for any given level of foot pressure on the lever. Most likely you won't notice much difference.
 
I'm not exactly sure of the correct answer, but I think the inside diameter of the hose will also make a difference. Pushing hydraulic fluid is like pushing a rod as it doesn't compress. So if you went to a smaller bore there may be more of a stroke needed to push the same amount of fluid if you were pushing two calipers, which maybe a total of two to twelve separate pistons, but since it it for the rear it is usually only one or two pistons. If you effort seems greater, I would think if you went to a ss braided line with a smaller ID, it would compensate for the loss. I could be talking out of my azz also.:indecisiveness:
 
The hole size in the line is a non factor. It doesn't change during brake usage and is already full of fluid.
 
Thanks.. it's for the KZ, not the GS.
More homework yielded the parts I need for $35, so I'm happy rebuilding the OEM master.
 
Good luck. Last yr. I bought a rebuild kit, from All Balls Racing, for an "83* GS1100E, & only appx. 1/2 the parts fit. I reused some of my old parts & some of their parts, to make it work. Real PITA. All seems OK now even tho old dust boot is glued together.
 
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