Grouch Posted June 29, 2012 Share Posted June 29, 2012 Yesterday my new set of brake pads came from eBay. So my friend who is a competent mechanic started to put them on. Everything went fine until we put the calliper back on and the piston in the calliper stopped working. I think it is seized because the pads were down to the metal. Completely my fault because I didn't realise. It has seized, I'm hoping it will free its self after a few days. Do you think it will? Also my new tyre came which cost me £80 (Pirelli Sport Demon). I went to the tyre place and he said I had to take the wheel off myself, so I did. It said on the tyre and in the Haynes manual that my tyre was tubeless, so I stabbed the hell out of it to get it off the rim. Turns out it had a tube in it!!! FFS! So the guy said he will have to order one and told me to come back today at 10am. I went there at 11:30am and then he said come back in an hour. I went back in an hour to be told it will be a few hours now. It seems every garage is out to fuck you about and have you over. Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted June 29, 2012 Moderator Share Posted June 29, 2012 You must of pushed the pistons back to get the pads to fit over the disks. Are you saying that the piston is not moving now? Has it been bled properly? The pneumatic pressure from the hydraulics should move a piston quite easily if the piston has already moved to accommodate new pads. For tyres, my rule of thumb is Spokes = Tube Cast = tubeless Not 100% accurate but very close. Some tubeless tyres can be used with a tube but normally tubeless tyres are quite rough inside and will burst a tube. Link to comment Share on other sites More sharing options...
Grouch Posted June 29, 2012 Author Share Posted June 29, 2012 Yes DT the pistons moved back to enable the new pads to be fitted, but one side has seized. I think it's because the pad was down to the metal so the piston was pushing out more than it should. I'm going to leave it a few days and see if it frees itself. If not I'll have to get a new calliper. The new tyre is on and straight away I noticed the difference. It is a lot better, the feel of it. It feels safer. It was worth paying the extra for a better quality tyre. Link to comment Share on other sites More sharing options...
Grouch Posted June 29, 2012 Author Share Posted June 29, 2012 Yes we bled it and it is just stuck. Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted June 29, 2012 Moderator Share Posted June 29, 2012 There looks like there is a brand new caliper on evilbay right now for £30. LINKY Link to comment Share on other sites More sharing options...
Grouch Posted June 29, 2012 Author Share Posted June 29, 2012 There looks like there is a brand new caliper on evilbay right now for £30. LINKY Thanks DT , I've seen it. There's two, one with pads and one without pads. The one with pads is a bit cheaper but it ended earlier. I'm waiting for it to be re listed. I already have a brand new set of pads, so I might as well save myself a bit of money. It's just cost me £120 to have the tyre fitted. Link to comment Share on other sites More sharing options...
dt502001 Posted July 1, 2012 Share Posted July 1, 2012 If you take the caliper off the bike and can pump the piston back out without the pads on far enough to be able to clean off the old brake dust it will freeup.You will have to clamp the other calpier to stop it from moving so all availble pressure can force out the seized one You should always pump the piston out and clean off the old dust before you push them back in. Tube vs tubless if the valve stem is bolted in 99.9% tube if it just a push in rubber stem 100% tubeless.A set of tyre irons cost 20 bucks and with some practice its a pretty easy job. TIP always start at the valve stem taking it off and finnish at the stem when installing,this way you can push the tube in out of the way from getting punchered by the irons Over here it cost 20 bucks just to get a tyre changed and not much diff about how fast they will do it,so I do all my own for the last 25years and my buddys now, more that paid for the irons now. Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted July 1, 2012 Moderator Share Posted July 1, 2012 Make sure the one you buy has the pistons in. I always pump out the pistons to change the seals and clean if I am having similar problem. If there are 2 pistons, the easiest way to do it is pump the lever and one piston normally moves more than the other. I clamp that one and get the other close to coming out and then clamp that and pump the other. As soon as one piston is out it is a bugger to get the remaining one out if you don't do it that way. Link to comment Share on other sites More sharing options...
Grouch Posted July 4, 2012 Author Share Posted July 4, 2012 Thanks guys Link to comment Share on other sites More sharing options...
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