softwarez Posted April 21, 2011 Share Posted April 21, 2011 My bikes front calipers seem to be staying open... i.e. When I try and spin the wheel it is very tight! I have taken both the front calipers off and removed the pistons and gave it all a clean. However.. this didn't fix it! I could push the pistons back in with my finger so I doubt it has to do with a seized caliper piston... any ideas what it could be and what I should do? I would appreciate it greatly, thanks.P.S - The bike is a GSX750F 02 Quote Link to comment Share on other sites More sharing options...
Guest Posted April 21, 2011 Share Posted April 21, 2011 am assuming the hydraulics operate correctly? Quote Link to comment Share on other sites More sharing options...
softwarez Posted April 21, 2011 Author Share Posted April 21, 2011 How do you mean, sorry? When I apply the brakes, it brakes as it should, quite well still.. Quote Link to comment Share on other sites More sharing options...
megawatt Posted April 21, 2011 Share Posted April 21, 2011 Did you replace the seals? If not remove old seals, clean and poish everything, fit new seals, apply Red Rubber grease to seals , then rebulid and bleed. Quote Link to comment Share on other sites More sharing options...
Guest Posted April 21, 2011 Share Posted April 21, 2011 what he said... still sounds like they not returning properly once 'pumped' Quote Link to comment Share on other sites More sharing options...
polecat Posted April 22, 2011 Share Posted April 22, 2011 Did you replace the seals? If not remove old seals, clean and poish everything, fit new seals, apply Red Rubber grease to seals , then rebulid and bleed. can you tell me what is red rubber grease and what is the diference between this and copper grease ? Quote Link to comment Share on other sites More sharing options...
Guest Hodgy Posted April 22, 2011 Share Posted April 22, 2011 Did you replace the seals? If not remove old seals, clean and poish everything, fit new seals, apply Red Rubber grease to seals , then rebulid and bleed. can you tell me what is red rubber grease and what is the diference between this and copper grease ? Red grease is specially designed to lubricate rubber without causing it to swell. Copper grease should never be used where it could contaminate seals as the metalic particles will cause excessive wear of the seals, it should only be used on the back of the pads, and then only sparingly. Quote Link to comment Share on other sites More sharing options...
polecat Posted April 22, 2011 Share Posted April 22, 2011 Did you replace the seals? If not remove old seals, clean and poish everything, fit new seals, apply Red Rubber grease to seals , then rebulid and bleed. can you tell me what is red rubber grease and what is the diference between this and copper grease ? Red grease is specially designed to lubricate rubber without causing it to swell. Copper grease should never be used where it could contaminate seals as the metalic particles will cause excessive wear of the seals, it should only be used on the back of the pads, and then only sparingly.cool thanks I will get some on Hebay cos I wanna do it proper What do you use on the bolts and pins btw? copper,red or white heat grease ? Quote Link to comment Share on other sites More sharing options...
megawatt Posted April 22, 2011 Share Posted April 22, 2011 I use nothing on the bolts as they should be torqued up clean and dry. The pins should also be clean, a bit of copperslip might help. Good luck and keep us posted. Quote Link to comment Share on other sites More sharing options...
Guest Hodgy Posted April 22, 2011 Share Posted April 22, 2011 Copperslip on the pins is fine, don't go mad with it though. I put just a touch of Copperslip where the bolts pass through the body of the calliper just to stop them siezing, although yes I know there supposed to be torqued up dry, so try and keep it off the threads Quote Link to comment Share on other sites More sharing options...
Fozzie Posted April 23, 2011 Share Posted April 23, 2011 I tend to apply a small bit of copperslip to the thread as well and have done on most of the brakes I've rebuilt. I've noticed if I don't the thread soon nackers itself after about 2 or 3 sets of pads and I don't want to use WD40 to free them up as its a disaster to get that on your brakes. I've never had any side effects, its always been a dab and then the pins have been torqued up correctly. So I have to ask is this a problem? As I've not had any. Also calipers are always a tricky business if you haven't worked with them much before. I tend to take out the pistons and properly clean out everything and then do the seals lubed up with some fresh brake fluid and red grease. And they have worked a treat for me everytime doing that, no binding etc Quote Link to comment Share on other sites More sharing options...
Guest Hodgy Posted April 23, 2011 Share Posted April 23, 2011 I tend to apply a small bit of copperslip to the thread as well and have done on most of the brakes I've rebuilt. I've noticed if I don't the thread soon nackers itself after about 2 or 3 sets of pads and I don't want to use WD40 to free them up as its a disaster to get that on your brakes. I've never had any side effects, its always been a dab and then the pins have been torqued up correctly. So I have to ask is this a problem? As I've not had any. Also calipers are always a tricky business if you haven't worked with them much before. I tend to take out the pistons and properly clean out everything and then do the seals lubed up with some fresh brake fluid and red grease. And they have worked a treat for me everytime doing that, no binding etc That sounds like the perfect way to do it to me, especially if the bike is ridden in the wet or through winter Quote Link to comment Share on other sites More sharing options...
Fozzie Posted April 24, 2011 Share Posted April 24, 2011 Good good, just making sure as I self discovered how to do brakes as opposed to being taught directly by someone Quote Link to comment Share on other sites More sharing options...
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