hi there im having trouble ive recently rebuilt my bike after some nice car driver decided to pull out on me ive put new front discs 2nd hand calipers and master cylinder on it now heres the problem the front end keeps binding after braking so i thought to my self its the caliper piston seals are knackered so i put new seals in after another run out the brakes have done it again so i thought the new discs are some how knackered so i put some 2nd hand discs on it yet another rum out and the problem persists im at my end any help would be greatful its killing me not being able to ride

Sounds like you were on the right track with the seals, did you do anything with the pistons?

or the M/C could do with a service !?

i think the next port of call will be to give the m/c a service i just wondered if anyone had any other idea or had it happened to them and had a definite fix

How thoroughly did you clean out the slots that the piston seals sit in? When brake fluid gets moisture in it and then dries it forms crystals. When they form under the piston seals they push the seals out of the slots and against the piston, stopping them from returning in the bores. Just putting new seals in wouldn't help this.

If you've not cleaned them out thoroughly, carefully remove your new seals so you can re-use them and carefully clean out the slots with a dremel with brass brush or a scribber or something like that. Use red rubber grease when you put the seals back in.

Or, if you've already cleaned them out, ignore the above.....

yeah i cleaned them out took me a while to do im now waiting on the master cylinder internals and new brake lines from hel hoping this will fix the problem the brake lever grows solid when it happens so im thinking its more master cylinder

did the master cylinder and added new brake line and its still f#@£ing doing it any clues people im dieing here

Have you got a HOnda lever in there or an aftermarket copy?

nope good old standard lever

id be changing the pistons next mate.