lyslexic Posted July 12, 2012 Posted July 12, 2012 Hi My mate pressed the brake lever on his bike when the wheel wasn't on. This resulted in the pads being stuck together. I've taken the pads off and pushed the pistons back with a large flat screwdriver. I then put the pads back in, mounted the caliper, spun the wheel (it spun without catching much), I then pressed the brake lever and tighted the caliper. This didn't help much as it's still binding a bit too much. The brakes are promax hornet. What is the easiest way to fix this? i have a bleed kit and dot 4 brake fluid. If I fill 1 syringe with brake fluid and connect it to the lever, followed by pushing the pistons back, would this work?
Mojoman Posted July 12, 2012 Posted July 12, 2012 Did the piston pop out? Was there any fluid leakage?
Capcha Posted July 12, 2012 Posted July 12, 2012 Probably have air in the system. Bleeding will be the answer. From pistons to the top off on brake lever will work.
lyslexic Posted July 12, 2012 Author Posted July 12, 2012 Did the piston pop out? Was there any fluid leakage? not sure what you mean by pop out? There was no fluid leakage. The pads were not totally stuck together (visable gap inbetween), the disc still fitted inbetween but catching on both sides.
Mojoman Posted July 12, 2012 Posted July 12, 2012 If no fluid leaked then I don't think it needs bleeding as no air should have got into the system. Maybe just some more fiddling with the caliper ie tighten, slacken, depress lever, tighten caliper, spin wheel etc. You sure you have the pistons as far in as possible in the caliper?
lyslexic Posted July 12, 2012 Author Posted July 12, 2012 After pushing the pistons in, the first time I press the lever it depresses half way. When I release and press again, it's rock hard and catches on the top. you only have to pull the lever 10 - 15% for it to be fully depressed, so i'm sure but i'm also sure after I press it the first time they come back up. But thanks, Will try fiddle around a bit more.
Greg29 Posted July 13, 2012 Posted July 13, 2012 Have you losened the brake mounting, spun the wheel and pulled the brake, then re-tightened the mounting (while holding the brake lever down) to align the callipers (and pads) properly to the disc?
Azonic Posted July 13, 2012 Posted July 13, 2012 Stuff a fat screw driver in between the pads and leave it for a bit.
lyslexic Posted July 13, 2012 Author Posted July 13, 2012 Have you losened the brake mounting, spun the wheel and pulled the brake, then re-tightened the mounting (while holding the brake lever down) to align the callipers (and pads) properly to the disc? yup, about 5 times with no luck. Discs still catches a bit when I spin the wheel Stuff a fat screw driver in between the pads and leave it for a bit. done that, but when I press the brake lever after spinning the wheel, the pads seem to go back to the original position.
Mojoman Posted July 13, 2012 Posted July 13, 2012 yup, about 5 times with no luck. Discs still catches a bit when I spin the wheel done that, but when I press the brake lever after spinning the wheel, the pads seem to go back to the original position.How much is a bit (i.e is there plenty of drag and the wheel comes to a stop quickly or just a slight scraping?) and are you sure the rotor has no warping to it?
Greg29 Posted July 13, 2012 Posted July 13, 2012 yup, about 5 times with no luck. Discs still catches a bit when I spin the wheel done that, but when I press the brake lever after spinning the wheel, the pads seem to go back to the original position. Only thing I can think of (which is mentioned above) is one of your pistons is jamming. Take off the whole unit, remove the pads and soak it in some warn soapy water for a half hour or so - don't undo any seals etc..... Then try brush around the pistons while pumping them out - it's a very small gap to get into. If you know somweone with an ultrasonic cleaner just pop it in there for a few mins to losen the dirt.
David Marshall Posted July 14, 2012 Posted July 14, 2012 Only thing I can think of (which is mentioned above) is one of your pistons is jamming. Take off the whole unit, remove the pads and soak it in some warn soapy water for a half hour or so - don't undo any seals etc..... Then try brush around the pistons while pumping them out - it's a very small gap to get into. If you know somweone with an ultrasonic cleaner just pop it in there for a few mins to losen the dirt. Agreed. You can then depress the brake without the pads in but with a suitable spacer between the pistons and apply a drop of whatever fluid you use to the pistons with a cotton bud to lube them.
Chro Mo Posted July 14, 2012 Posted July 14, 2012 Stuff said large flat screwdriver in between the pads and depress brake lever as hard as possible.Place wheel back on and do the same with the rotor in place.pads should realign if no air is in the system.This has worked for me in the past.
Big H* Posted July 14, 2012 Posted July 14, 2012 Sjoe!!!!! Rather take the bike to somebody who knows how a hydraulic brake system works!!!!!!!!!
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