Front brake problem

4 replies to this topic
  • fastenuf4u

Posted June 04, 2006 - 11:48 AM


I took a spill yesterday that messed up both radiators, right side radiator shroud, my shoulder and my front brakes. It seems their is a ton of air in the line but I don't see how since no fluid is leaking out. If I look inside the master cylinder their seems to be a circular plastic piece above the holes where the fluid goes, but their is a piece of black debris in their that looks like plastic or something. I can't take it out since their is that circluar piece in their. The brakes will get some (very little) pressure and then it drops. I have tried to bleed them but no matter how many times I do it the lever pressure never changes. Do you think I need a new master cylinder?

  • Matt96xr6

Posted June 04, 2006 - 02:48 PM


you most likely tore a seal on the master cylinder. you need a rebuild kit, then bleed the MC and the brake line and caliper.

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  • fastenuf4u

Posted June 04, 2006 - 06:08 PM


Thanks for the info. I just checked and it looks to be about 25-30 + shipping for a mc rebuild kit, I may just get a new one from the TT store for 50 and not worry about screwing it up and having problems with it later. Thanks again for the info.

  • Drfletcherdc

Posted June 04, 2006 - 07:35 PM


Another thing is if your master cylinder on your handlebars were turned upside down, you just got air in your line. It happen to me when I was changing handlebars and left the levers dangle down.

  • fastenuf4u

Posted June 05, 2006 - 05:19 AM


Nope, the master cylinder never made it into the inverted position, just on it's side as my bike laid there while I was tended to by the medical staff. I am pretty sure it is the seal as Matt96xr6 mentioned, the black piece of debris looks alot like a piece of a rubber seal. Thanks for that bit of info though, I sometimes let my MC hang down when changing handlebars but I might think twice if it would allow air into the line!

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