Rear brakes making noise/sticking 85 VF 750F

So in the last month I have noticed an issue with my rear brakes. Well, maybe my rear brakes anyways. When I am riding the bike I can notice a squeak that seems relative to the rotation of the tire. The faster I go, the faster the squeak. I originally thought it was a warped brake rotor, but I had the brakes looked at and the shop said the rotor was in good shape, so I had them clean the brakes (no flush though) and now the noise is worse.

When I have the bike up on its center stand, I can spin the tire backwards and there is no noise. When I spin it forwards it will make the noise and gradually stop the tire as if brakes are being applied, even though they are not. If I spin the tire and hammer on the rear brake pedal, the tire stops fine. After applying great pressure to the brakes, when I get started again, there is hardly a squeak and the tire spins with lesss effort. When applying light pressure to gradually stop the tire (like a person normally would do in traffic, rather than lock it up) it will make the noise and braking effect.

So please let me know if this makes sense. I think the brake fluid might be old and absorbed some water, therefore it does not pressure up and down the way it should. So I can compress the fluid enough to get some braking action, but the fluid does not decompress enough so the pads are contacting the rotor still. Even after the caliper and all was cleaned, it still does this though. The pads do no contact near the bottom of them, but it looks like they may be contacting at the top. So is this plausible?

The other thing I thought of was if the rear axle had moved closer to the front. Kind of like if someone was adjusting my chain tension (I had it in the shop for 3 weeks last month so this is possible). Would that affect the brakes though? If the axle were moved further away or closer to the front of the bike...

I am kind of lost as to what the noise is. I am definitely going to change the brake fluid, even though it LOOKS fine (in the reserve). I would just like to get some thoughts together. Thanks.

 

i had this problem on my shadow and even though it had drum brakes for the rear, it was just old pads. i even took things apart and roughed up the surface on both the drum and the pads. it went away for about a week and then came back. i changed the pads out and it never did it again.

how old are your pads?

could also be a sticking caliper from gunk built up around the pistons, thus not allowing a piston to retract all the way. it could also be bad lines. if you have rubber lines you will know when it is time to replace them by looking/feeling them when you apply brake pressure. if you can see/feel them expand, its time to replace them.

 

I will take a look at the lines and check them out.

As for the pads, i do not know the age of them. I am going to assume pretty old. There is loads of life still in them. The size looks fairly new, but they are still probably many years old.

 

replace the pads....noise will go aaway

 

my pads were in the same shape when i replaced them. i compared them to the new ones when i swapped them out and there was less than a 1/16 of an inch difference between them. they were just old, glazed, and had hardened due to age and weather.

 

The lines do not seem to bulge or anything and look generally good.

So I will try flushing the fluid and putting on new rear pads. Thanks for the replies guys!