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Buell Motorcycle Forum » Quick Board Archives » Archive through December 09, 2004 » Front brake lock up « Previous Next »

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Patrick_atlanta
Posted on Tuesday, December 07, 2004 - 09:26 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I had the pleasure today of driving at about 45MPH when the front brake locked. I was lightly braking at the time. I did manage to keep her upright.

I had to get her out of the six-lane highway, so I lit the rear tire up to get to the shoulder. Now I think I have burned the clutch’s friction plates (tranny engages, but will not move the bike). The fluid smelled awful. I will not know for sure until I make a tool at work to release the clutch’s retaining clip.

Anyways, this is the first time I have ever had this happen on any of my bikes. I am running DOT5 fluid. My only guess is the system is contaminated with water, which boiled increasing system pressure causing the caliper to lock. I am looking for some insight, as I am now weary of re-mounting the M2 for obvious reasons (I did search the archives and found some speculation regarding this phenomenon).

Thanks!!!
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Firemanjim


Posted on Tuesday, December 07, 2004 - 10:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Patrick,there is a check valve in the m/c that is supposed to release pressure back to m/c that can get gunked up and stick causing pressure buildup locking brakes.
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Patrick_atlanta
Posted on Tuesday, December 07, 2004 - 11:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Thanks for the feedback. My relief valve does not move any fluid to the surface with the master cylinder cover off and the brake lever engaged. There is some "stuff" at the bottom of the cylinder. What is the best way to clean the system? The manual recommends using alcohol followed with compressed air. Is this done as an entire assembly or broken down (master cylinder, brake line, caliper)? The manual does not show a flow path for the relief valve. I also do not want to damage any of the components using compressed air.

My company manufacturers stainless steel braided metal hoses (inner hose and braid are stainless steel). I would like to fabricate new brake lines, but I need stainless steel banjos for attachment (I cannot weld the material on the existing hoses). Does anyone know where I can locate the proper fittings?
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