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Nobody will have as much fun as me today!!

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UK Pete:
check the  piston or pistons, and all the caliper  pivots etc are all working ok , i had a similar problem on a bike it turned out the caliper was not free to move as it should, and the piston was pushing the pad on to one side of the disk which was tring to bend the disk , the other side was barely touching, so it was never griping the disk tight ,

mickwinf:
use a neighbours dog to kick, saves upsetting the kids!!

MarkCR750:

--- Quote from: UK Pete on April 25, 2014, 01:07:30 PM ---check the  piston or pistons, and all the caliper  pivots etc are all working ok , i had a similar problem on a bike it turned out the caliper was not free to move as it should, and the piston was pushing the pad on to one side of the disk which was tring to bend the disk , the other side was barely touching, so it was never griping the disk tight ,

--- End quote ---

Cheers Pete, they are all fine, refurbished, greased etc, I also shimmed the arms to ensure the callipers were square to the discs, I'm sure its air in the system, the lever (Fireblade master cylinder) has got that characteristically soft bouncy feel, I should have stuck at it earlier but I will go for raising the callipers above the reservoir tomorrow after the Stafford show.

K2-K6:
The first part of any master cylnder travel closes off the supply from the reservoir (else the brake fluid will go there instead of down the line to the calipers) so I don't understand what tying the lever in will do. If you want the system left open then leave the lever alone and any air that can travel up the line will properly come out into the fluid reservoir.

With most systems if they are reluctatant to bleed, then if you try bleeding out of the pipe with it disconnected from the caliper to get it free of air, and then reconnect to get the caliper to bleed as well........this is when you can hold the lever in while you reconnect the pipe to the caliper as it will prevent it drawing air back into the pipe end.

These calipers just don't feel like modern stuff in that they never get such a firm pressure at the lever in all the systems I've tried. They have more mechanical flex in them which you can only really judge when you ride and use the brakes to see what you really have.

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