If one piston was seized the other 3 would still move, my money's on the M/C is to small.

 

You can use a stock caliper on a springer. Just buy or make a brkt.

This one is ugly but gives you an idea.

http://www.ebay.com/itm/custom-brake...7f2cc3&vxp=mtr

 

Thanks for the link on the bracket. that does give me an idea. Going to try messing with the pistons in the caliper after work. If I can't get it going I will probably try something similar to that with what I've got. Hate to think I paid $275 bucks for a caliper that will not work.

 

Think I've found the problem here. The only new part I didn't buy was a rotor. Would the thickness of the rigor need to be matched to the caliper? I wouldn't think it would make much of a difference. Would think that the difference in thickness would be minimal compared to pad wear. Still a little puzzled here.

 

No, not with brand new pads.

 

Yeah, brand new pads. I did find a temp. fix tho. I placed a shim behind one of the pads and bam, I had a solid lever pull. Guessing that master cylinder volume is the problem here as some one has already stated. Not sure what my next step will be. Either try and find a larger master that will match the other control set up or rebore the master. Not sure that the second of the two is an option.

 

The MC from a R model Sporty should give you the volume you need. The R model had dual front disc brakes (dual - 2 piston calipers).