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Avid Juicy 7 hydrolic disc brakes piston lock up

My front Juicy pads are pushed all the way closed. I can't fit the disc in between the pads because the pistons are pushed all the way out. I had my bike in the car for a day, with the front wheel off. I go to put the wheel back on and the pistons won't return to fully retracted. When I pull on the brake lever, the pads to slightly move together, but they don't return to the fully retracted position. Maybe the heat expanded the fluid and jammed the pistons? How do I go about fixing this?

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  • rowan670 Dec 14, 2008

    I have the same problem, happened the same way with out the heat though. The wheel was off for a few hours and when trying to but it back on the pads were too close together for the disc to fit.

    I don't see how to use the clamp. any further explanation on how to fix the problem.


  • shturner Dec 27, 2008

    I have same problem after removing the wheel to wash the bike. Any other advice? if i bleed the brakes at what stage should I push back the pistons?

  • singlefin Apr 26, 2009

    Me too. I have exactly the same issue as you and I couldn't have explained it better myself. What's the answer?

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Do not bleed the brakes! If you don't have the plastic rectangular spacers that came with the brake when they were new, go to your local bike shop or get an "old" teflon kitchen spatula that's thin enough to fit but make sure its a bit thicker than your rotors and try to pry the pads apart then wiggle it until a good portion is in between the pads. Then squeeze the brake lever with the spatula is in between. This should reset the pads leaving enough clearance for your rotor to fit. NOTE: Avoid depressing the lever when the wheel is off. This will cause the pistons to travel further than usual causing both pads to come together. Hope this helps.

Posted on Mar 05, 2009

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Well if you have the transportation plastic "tool" that usually comes with the brakes you can insert it in between the pads and it will retract them, otherwise use a wide screwdriver and insert it between the pads and then gently pry the pads apart. That will do it...If anything in the future just visit your LBS and ask them if they have any of those transportation pieces around so you can insert it in between the pads the next time your taking your bike somewhere.

Posted on Jan 27, 2009

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If there is enough space to fit a flat headed screwdriver in the gap, use it to gently push the pistons back in to the housing.

Your not supposed to squeeze the lever while the wheel isn't fitted.

Posted on Jan 08, 2009

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When you take the wheel off, put a piece of heavy cardboard, or plastic such as ice-cream container (or the like), or icy-pole stick... basically something slightly thicker than your disc, between the calipers to stop the pistons being able to close. If the levers are accidentally pushed, the pistons won't blow out.

Posted on Jan 24, 2009

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Use a c clamp and very slowly compress them back in

Posted on Dec 02, 2008

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