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Got a set of Hayes 9 brakes. They are not for me but my brother who wanted some to upgrade from Hayes Soles. I have as always got the job of fitting all the stuff he gets for his bike. The problem is when I got the brakes the disc was a very tight fit if you just shoved the rotor in the pads. Very tight in fact. I knew this would be a problem when fitting.
When you pumped the lever in it wa if there as no movement on the lever, like it was solid, too much pressure in the brake. I thoughthe brake could be overfilled with fluid as the pistons could not be forced back anymore. I cranked open the bleed nipplle and did not press the lever in fluid came out and I quickly nipped the bleed nipple back up. I got the front brake working ok doing this and the lever feel feels nice now, you can actually move the brake lever and get some modulation!
I cant seem to get the back brake to follow in the same vain though. It keeps catching on the rotor and looks like the pads dont force themselves back enough. Is this du to sticky pistons? I hate Hayes brakes my self and would never buy any, I have had similar problems with Hayes brakes before always catching etc. I only use Shimano or Avid BB7s.
Try silicon grease?
I do it like this (interested if anyone thinks its wrong) -
When you bleed the brakes make sure that the pistons are jammed closed by pushing something like a spanner between them. Keep the pistons jammed closed like this for the whole bleeding process. This seems to alleviate the problem of pistons being to near too each other. I do trhis with Hayes 9(and so1e's) and Juicy 7's.
Looks like a bike shop job then as I dont have a Hayes bleed kit.