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Front brake leaking?

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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With the help of the carb cleanup pages I got my '82 650G back on the road. Everything is running pretty well. But now I have noticed some oil like fluid on the left front brake rotor. I think it is brake fluid leaking from brake caliber.

The bike has been sitting since 1996 in back of a garage so it is possible some of the seals may have dry rotted. Can you rebuild the calibers or should I pull the calibers from my other 82 650G parts bike and swap it over? Could it be something else leaking? I have also recently noticed a sort of rubbing noise coming from the front end at low speed. Like a brake pad is rubbing against the rotor.

Thanks,
John
 
It could be brake fluid. If it is you could easily tell by removing the caliper from the rotor. If the seal is leaking you will have your hands full of fluid. There is an O ring in the piston that can get pretty worn that can be replaced. Also the dust boots can become cracked and allow all sorts of stuff to get into the system. You mat also have a broken brake line. This would see fluid where the line meets the brake.

When was teh alst time you flushed yoru break fluid? It can get pretty bad after a few years (read 15). It should be clear and not brown. If it si brown it shoudl be replaced and flushed.
 
Keep in mind that the rubbing is normal to some degree. The calipers on our bikes are self centering, some drag is nessecary for the pistons and pads to stay centered on the rotor, so that both left and right pistons in each caliper work effectively. You should be able to push the bike around in nuetral, but the pads should rub slightly.
 
Thanks for the replies. I took the caliper off the bike last night and I couldn't find any signs of a leak. There was some sort of heavy grease in between the grove in the middle of each brake pad where the pad faces the rotor. Any ideas where that came from? My guess that the grease was melting and getting on the rotor. I also noticed the bolt that holds the brake line to the caliper was a little loose.

I cleaned everything up. I am going to flush and refill with new brake fluild tonight and see if I got it fixed.
 
Could it be fork oil leaking? That is much more common and often will be stopped just by properly airing up the forks.
 
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