Stupid question alert !

[exdirtbiker]

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.

[Nessism]

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.

[gsrick]

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.

[Nessism]

The hole size in the line is a non factor. It doesn't change during brake usage and is already full of fluid.

[exdirtbiker]

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.

[rphillips]

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.