gkms Posted October 22, 2013 Report Share Posted October 22, 2013 Hi guys, my Hope Mono Trial with 180 mm disk lost its power without an obvious reason. I replaced all seals, pads and disk. Needless to mention the bleeding. It still hasn't regained its original break power. Any ideas? Regards Georg Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted October 22, 2013 Report Share Posted October 22, 2013 Have you cleaned it with anything? Quote Link to comment Share on other sites More sharing options...
paulotrialsrider Posted October 22, 2013 Report Share Posted October 22, 2013 WD40 Quote Link to comment Share on other sites More sharing options...
gkms Posted October 22, 2013 Author Report Share Posted October 22, 2013 No, didn't clean anything. Was no need except of course after the bleeding but sure without the pads and the disc Quote Link to comment Share on other sites More sharing options...
persistant_itch Posted October 22, 2013 Report Share Posted October 22, 2013 The copper washers attaching the hose to the caliper on the 90 degree connector could be gone? I had a very similar problem,cost me time and money, only to discover it was a 5p washer was warped.Also, it might'nt be warped, the connector nut might have come loose. maybe clean the thread of any of the bolts, dirt or filings can stop agood seal forming Quote Link to comment Share on other sites More sharing options...
dezmtber Posted October 22, 2013 Report Share Posted October 22, 2013 How old is the brake? and how does the lever feel f pulled quickly and how does it feel if pulled in really slowly Quote Link to comment Share on other sites More sharing options...
gkms Posted October 23, 2013 Author Report Share Posted October 23, 2013 (edited) The brake is 2010. If the lever is pulled slowly it goes further than if pulled quickly. Does that mean anything? There is no sign of leakage anywhere. Edited October 23, 2013 by gkms Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted October 23, 2013 Report Share Posted October 23, 2013 That sounds like air in the system unfortunately... You can also try: - Firstly, clean the disc caliper with a rag so its free of any brake dust and dirt etc. - Spray or pour some cold, clean water on the rotor. Then ride around slowly while pulsating the brake on and off (1 second on, 1 second off). You don't need to pull the lever very hard, you are basically try to scrub the pads up using the rotor and the water will help clean them. - Do this for 5 minutes and you will notice the water turn black. Wash this off with water and then repeat the process a few times. - On the final run, let the brake dry up and it will hopefully be much better. 1 Quote Link to comment Share on other sites More sharing options...
gkms Posted October 23, 2013 Author Report Share Posted October 23, 2013 (edited) OK, I'll bleed again and then try to clean it the way described. Edited October 23, 2013 by gkms Quote Link to comment Share on other sites More sharing options...
tom@eastcoasttrials Posted October 23, 2013 Report Share Posted October 23, 2013 find a big hill ride down it holding brake on slightly so it gets hot then pour water over it Quote Link to comment Share on other sites More sharing options...
gkms Posted October 24, 2013 Author Report Share Posted October 24, 2013 find a big hill ride down it holding brake on slightly so it gets hot then pour water over it I tried this before. Didn't work either Quote Link to comment Share on other sites More sharing options...
dezmtber Posted October 24, 2013 Report Share Posted October 24, 2013 Did you replace the master cylinder seals ? Quote Link to comment Share on other sites More sharing options...
gkms Posted October 24, 2013 Author Report Share Posted October 24, 2013 I replaced all the seals including master cylinder. I just bled the system once again and I tried the procedure adam described. It's maybe a little better but far from being good. I checked if both pistons of the caliper move so none got stuck. I will compare the brake with my mate's brakes to see if I have turned neurotic. Does the tech lever provide more brake power than the mono? Because I tried one with tech levers yesterday. It is definitely a lot stronger. Quote Link to comment Share on other sites More sharing options...
AkuskaUK Posted October 25, 2013 Report Share Posted October 25, 2013 I've found that the tech lever is alot more powerful than the mono, it may be due to the ajustable parts and larger piston? Correct me if I'm wrong! A friend of mine has a mono and my tech v2 always feels a lot stronger... Quote Link to comment Share on other sites More sharing options...
dezmtber Posted October 25, 2013 Report Share Posted October 25, 2013 sounds like air in the system or a faulty master cylinder seal. try hanging the bike up by the front wheel with a zip tie holding the brake on, leave it over night. in the morning cut the zip tie off and repatedly pull the brake letting go of the lever so it returns quickly., if this works then top up the resovoir and if this fails then back to a full bleed again Quote Link to comment Share on other sites More sharing options...
gkms Posted November 7, 2013 Author Report Share Posted November 7, 2013 Finally I got my brake working again. What did I do: After many times bleeding I bled with water. It got a good pressure point but the pistons of the caliper got stuck. So I bled with dot again. I realised I had used dot 4. This time I usd the recommended dot 5.1 and now it works. I am still not shure if it was the fluid or if I just had a buble of air trapped somewhere in the system. In any case, thanks for your advice. Quote Link to comment Share on other sites More sharing options...
ben_travis Posted November 8, 2013 Report Share Posted November 8, 2013 Yuo should have probably put that down in your first post dude. that way we'd have been able to point out your mistake from the start....you bled your hope mono trial with water? 1 Quote Link to comment Share on other sites More sharing options...
gkms Posted November 9, 2013 Author Report Share Posted November 9, 2013 It was an act of desperation after bleeding 15 times with dot Quote Link to comment Share on other sites More sharing options...
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