125fightingmachine Posted October 29, 2016 Share Posted October 29, 2016 Hi guys, have been having a bit of bother with a stiff front wheel for a while now - has been on and off. I'm looking at the piston and am wondering if it's meant to sit flush with the caliper or if it's meant to rise above the caliper by about 2-3mm. Cheers, Louis. Happy riding Link to comment Share on other sites More sharing options...
slice Posted October 29, 2016 Share Posted October 29, 2016 Nope only time it should be flush is when you first put it in after you have put new pads in. After that it sits proud, try CAREFULLY to push the piston out a short distance, use an air line if you have one, put something inside the caliper so the piston doesn't come right out, old brake pads are ideal for this, and check the state of the piston to see if it's rusty, if not then that's probably not your problem. Have you checked the front wheel bearings? 1 Link to comment Share on other sites More sharing options...
125fightingmachine Posted October 29, 2016 Author Share Posted October 29, 2016 Cheers for that slice have changed the brake piston, seals, pads and fluid. When I took the old pads out they were getting worn unevenly - could this be over tightening the front axle (pulling the forks in closer together maybe?) It's a ybr 125.. Would dodgy wheel bearings come on and off (stiffening the wheel up every day or two? Link to comment Share on other sites More sharing options...
KirriePete Posted October 30, 2016 Share Posted October 30, 2016 Uneven pad wear is usually down to the sliding pins sticking in the caliper body. I'd clean them up and give them a light coat of silicone grease. 2 Link to comment Share on other sites More sharing options...
slice Posted October 30, 2016 Share Posted October 30, 2016 As above does sound like pad wear, good idea to free up the pins, give them a sand down with wet and dry then grease them, see if that makes any difference. 1 Link to comment Share on other sites More sharing options...
125fightingmachine Posted October 30, 2016 Author Share Posted October 30, 2016 Cheers guys appreciate the replys. Will let you know how I get on. If the slider pins are sticking, this could cause sticking brakes couldn't it? Link to comment Share on other sites More sharing options...
jimmy Posted October 30, 2016 Share Posted October 30, 2016 Yes, that could cause sticky brakes 1 Link to comment Share on other sites More sharing options...
125fightingmachine Posted October 31, 2016 Author Share Posted October 31, 2016 Right, so pretty happy today as I sorted the brake problem - I'd bought pads that were ever so slightly bigger than the stock pads. The piston pushed it forward but it didn't spring back (got wedged in). Shaped into the stock pad shape we were good to go. Also when I bled the brakes I didn't give the lever a few final pulls to push the piston all the way out, resulting in a lot of lever play. 2 Link to comment Share on other sites More sharing options...
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