Greetings Posted November 10, 2006 Report Share Posted November 10, 2006 Found a few solutions to my problem but they only work in the short run (20 minutes of riding), then the problem comes back. The left piston (from the riding position, looking at the brake) is seized and doesn't move at all. The right piston moves, but only towards the disc. So when I press the brake lever a few times, both the pistons seize on the disc and it's a real challenge to take the caliper off the disc. The seizure is so strong that it's almost impossible to move the wheel with your hands. I've tried changing the brake fluid, using WD40 on the piston and lubing it with something I think is silicone grease, and it only helps briefly. Any ideas? Quote Link to comment Share on other sites More sharing options...
THE trials commentator Posted November 10, 2006 Report Share Posted November 10, 2006 have you contacted hope?i know it sounds a bit patronising,but theyre generally pretty good with advice an stuff.Carl Quote Link to comment Share on other sites More sharing options...
Greetings Posted November 10, 2006 Author Report Share Posted November 10, 2006 I think I'll have to. Should I use the address info@hopetechnology.com?I've now lubed the piston with another type of grease and it's working well, there's only one problem. The piston moves so easily that it won't adjust to the disc. When I press the lever, it should bring the pads near the disc and then suck up fluid from the resevoir to auto-adjust. It doesn't do that any more. Quote Link to comment Share on other sites More sharing options...
THE trials commentator Posted November 10, 2006 Report Share Posted November 10, 2006 yea i think thats the right mail address.sounds to me like it might be a seal gone?im sure hope would let you know exactly what it is.may even give you some sels for free?they did for my mate a few years back on a mono.Carl Quote Link to comment Share on other sites More sharing options...
sir trial a lot Posted November 10, 2006 Report Share Posted November 10, 2006 some people use grease etc on pistons but as a bike mechanic myself (mototbikes and pushbikes) i would only EVER use the type of brake fluid that the system uses to lubricate the pistons. as you can imagine, the brake is run on dot fluid because thats what the seals are made for, therefore some other lubricants can nacker the seals. Quote Link to comment Share on other sites More sharing options...
Greetings Posted November 10, 2006 Author Report Share Posted November 10, 2006 That's exactly what my dad said (he's an engineer) but on the other hand I read in a post Mr. Read made, that silicone grease is the best thing to use. So I either trust somebody who has practical knowledge on this very subject, or people who think it's unwise for a reason I do not understand. Looks like I've got rid of the problem when I fled with rage and started pressing the lever with all my might. CLOSED SYSTEMS ***. Quote Link to comment Share on other sites More sharing options...
trialsalot Posted November 10, 2006 Report Share Posted November 10, 2006 yeah adam at tarty works pretty close with hope.i was down there for a bit and he tartyfied my mono trial.....it was a switch when he was done with it!!i had a problem with the hole that the bleed nipple sits in.when it was drilled through it made a burr so adam filed it down,re-lubed the pistons with silicone spray,re bled the whole system and faced the mounts SOME BOY!!!give them a ring or e mail them on monday...although you might of already by the sound of things.craig Quote Link to comment Share on other sites More sharing options...
Brisa Posted November 12, 2006 Report Share Posted November 12, 2006 You wont really go wrong with silicone grease, works well with a lot of seals including 3000 psi plus airgun seals.Brake fluid is as handy though. Quote Link to comment Share on other sites More sharing options...
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