bortaf 96 Posted June 28, 2011 when i did the ones on my Mk3 i used the air line off me commpessor, took 80 PSi to shift one of em, now that was a pop ! :shocking: i used a Gclamp to hold the free one in while i popped out the stuck piston :thumbup: As long as the pitting is outside of where the seal sits that's fine :) when your pushing them in it don't take a lot of off straight angle to lock em up, allways makes me wonder why they dont stick more often TBH :headscratch: Quote Share this post Link to post Share on other sites
Derskine 11 Posted June 28, 2011 (edited) when i did the ones on my Mk3 i used the air line off me commpessor, took 80 PSi to shift one of em, now that was a pop ! :shocking: i used a Gclamp to hold the free one in while i popped out the stuck piston :thumbup: As long as the pitting is outside of where the seal sits that's fine :) when your pushing them in it don't take a lot of off straight angle to lock em up, allways makes me wonder why they dont stick more often TBH :headscratch: It was on the outside yeah, everything below the seal is perfectly fine :D If only I had a compressor would make my life much easier, but I clamped the other with a g clamp too. And yeah its very easy to get them stuck putting them back in, then you have to take the clamp off and clamp it from the other side, very fiddly and annoying! I tell you though, repainting something that was covered in brake fluid resulting in a horrible goey mess is not easy! You were right though about rust gripping the pistons, I expect on the other side both pistons will be stuck, but anyway, these will be as good as new once they're all fixed up and painted :) I also meant to ask, you know the little spring type thing that goes on the brake pads, I got it with my kit, does this need to be fitted? I've seen calipers without it before and I can't see anywhere for it to fit? Edited June 28, 2011 by Steelrax Quote Share this post Link to post Share on other sites
bortaf 96 Posted June 29, 2011 when i did the ones on my Mk3 i used the air line off me commpessor, took 80 PSi to shift one of em, now that was a pop ! :shocking: i used a Gclamp to hold the free one in while i popped out the stuck piston :thumbup: As long as the pitting is outside of where the seal sits that's fine :) when your pushing them in it don't take a lot of off straight angle to lock em up, allways makes me wonder why they dont stick more often TBH :headscratch: It was on the outside yeah, everything below the seal is perfectly fine :D If only I had a compressor would make my life much easier, but I clamped the other with a g clamp too. And yeah its very easy to get them stuck putting them back in, then you have to take the clamp off and clamp it from the other side, very fiddly and annoying! I tell you though, repainting something that was covered in brake fluid resulting in a horrible goey mess is not easy! You were right though about rust gripping the pistons, I expect on the other side both pistons will be stuck, but anyway, these will be as good as new once they're all fixed up and painted :) I also meant to ask, you know the little spring type thing that goes on the brake pads, I got it with my kit, does this need to be fitted? I've seen calipers without it before and I can't see anywhere for it to fit? Not really needed TBH, it's there to stop pad squeel, sometimes a problem sometimes not, pads are made of differant material nowdays and can squeel more or less depending on the make IME. Quote Share this post Link to post Share on other sites
Danish 294 Posted June 29, 2011 I think really all it could be is the master cylinder not giving enough back pressure or the pistons being a little sticky. I had that problem on my Capri with M16 calipers. I popped out the pistons, gave them a clean with very fine emery paper, fitted a new seal kit and they were as good as new! Quote Share this post Link to post Share on other sites
Derskine 11 Posted June 30, 2011 I think really all it could be is the master cylinder not giving enough back pressure or the pistons being a little sticky. I had that problem on my Capri with M16 calipers. I popped out the pistons, gave them a clean with very fine emery paper, fitted a new seal kit and they were as good as new! I think this is all thats wrong with mine too, cheers for input guys, I'll report back when everythings done! Quote Share this post Link to post Share on other sites
Derskine 11 Posted June 30, 2011 Finally finished, really hope I don't have to do that again any time soon. Second caliper was seized solid and a nightmare to get out, 65 psi with an electric car tyre compressor popped the hardest one out, light sand, new seals, lube and they went in nicely, just waiting on the paint drying to test them out again, I really see no reason why they won't work now. PS - Those repo aluminium master cylinder caps are useless, undone one, not even harshly and it cut the threads off itself, back to my old rusty steel fomoco ones for sure :thumbup: Quote Share this post Link to post Share on other sites
Derskine 11 Posted July 3, 2011 (edited) Still not fixed, I think the problem is I'm not compressing the pistons fully before installing the brake pads, it sounds logical as a problem. Good thing I overhauled them though, they grip really well now, just don't ungrip :thumbdown: Edited July 3, 2011 by Steelrax Quote Share this post Link to post Share on other sites
Derskine 11 Posted July 4, 2011 Think ive fixed this by compressing the pistons in as much as I can, although it still drags a bit, when the wheel is on, it can be spun with only a bit of resistance. Just charge up the battery and it'll be driven for the first time in 30 years... oh Im excited :icecream: Quote Share this post Link to post Share on other sites
Derskine 11 Posted July 4, 2011 They don't drag enough to cause problems :thumbup: Quote Share this post Link to post Share on other sites
