'77 GS750 Front Brake Issue

[Guest]

Hi everyone, I've been having a problem with my front brake. I keep getting what looks like carbon buildup on my front rotor. I've check for binding and cleaned the entire from the assembly 3 times even though I see no signs of leaks of dirt. Any thoughts?

[Nessism]

Did you remove the caliper and check the piston seal?

[izzymad3]

I did... There was no signs of a leak. In fact the side of the rotor with the piston has no build up or staining, it's only the side with just a brake pad and nothing that could leak.

[Nessism]

Fork seal leaking?

[izzymad3]

Fork seal leaking?

Just rebuilt them last month... I've even tried thoroughly cleaning the pad on that side and it still makes that mark.

[Nessism]

Maybe the pad is contaminated from a previously leaky fork?