Special Problem with Formula The One 2010
I've got a special problem with my 2010 The Ones:
If I pull the lever quickly, there is a firm pressing point and tons of braking power, but if I pull the lever slowly it nearly reaches the handle bar before the pressing point is there. Braking power then reduces dramatically...
I've bleeded the brake yesterday, but problem is still there. There are no leaks, system is closed.
Anyone knows what the problem could be? I never had such strange behaviour with brakes...
Attached two pics showing the position of the pressure point
1st: lever pulled slowly
2nd: lever pulled quickly
Please excuse my English, as I'm not a native speaker
They need a better bleed.
I would try to bleed the brakes again. There still seems to be air in the system. If the problem is still there after another one or two bleeds, you made need to send the MC back to Formula.
Bleed has not been done properly.
I'm new to hydraulic brakes on bikes, but am very familiar with auto applications.
From what you've discribed this is a classic master cylinder piston seal leak symptom.
I had the same problem with my K24s. It is not a bleed issue, but rather a faulty master cylinder seal. The fluid is under minimal pressure and is moving slow enough that it can bypass the seal.
Call Formula, send it in. They have a very quick turn around and will have you working in no time.
That's exactly what I was thinking. If it's not air in the line, it can only be a defective MC piston seal (or, worse-case scenario, a over-machined piston bore).
Originally Posted by tiSS'er
What use is a philosopher who doesn't hurt anybody's feelings? -
I would say it need a better bleed,Air still in the lever.
I agree that this is the symptoms in a car of a leaking master cylinder seal. Despite what others say if a bleed was needed you would have the problem all of the time and not just when you pull the lever slowly.
Originally Posted by michael9218
Sorry to hear that you are having problems with your brakes. A problem like that is pretty hard to diagnose without actually seeing the brake in person. It could point to a bleed issue or a faulty MC piston seal like some on this forum have suggested, but it could also be something else.
The best way to find a solution to your problem is to either take the brake to your local bike shop or call the distributor in your country. I noticed that you are in Germany where we have one of our best distributors: Cosmic Sports. I would recommend that you contact them and they can help you find the best solution to getting your brakes fix and back on the trail as quick as possible. You can find their contact info here: http://www.formula-brake.it/en/distributors
Perigeum Development / Formula Brake USA
I had the exact same issue with my Biancos and my R1s, both times it was the master cylinder seal. Initially I tore my hair out bleeding and re-bleeding, with no improvement in lever feel, and eventually was put onto the master cylinder issue.
Fixed the problem by going back to XTR.
Hi, many thanks for your replies.
I suppose it will be a problem with the MC as most of you do. Because I bleeded them correctly and it was not the first time for me bleeding brakes.
Now I will contact our german distributor (Cosmic Sports) hope they will help because I've bought them originally from an italien online store.
Btw, regarding power, modulation and weight the brakes are the best I've ever ever used. Hope that reliability won't be same as with earlier italien sport cars ;-)