The rear brakes and rotors were replaced 5/2011 and now i see scoring on the rotors again only 10,000 miles on them
SOURCE: FLSTSI 2005- Rear brakes would engage while
By design, a disc brake system does keep a slight pressure on the rotor. The pads on a disc brake do not back off like they do on a drum brake. There are no springs to pull the pads back. Additionally, the pads keeping slight pressure on the rotor is what keeps the rotor clean and dry so that you have good brakes even when riding in the rain.
What the problem sounds like to me is either you have air in the brake or your rear brake pedal is not returning to it's top position for some reason.
First, bleed the brakes and make certain there is no air in the system. Depress the pedal and hold it down, open the bleeder valves and let out the air and brake fluid, close the bleeder valve, relaease the brake pedal and wait a minute for the cylinder to recharge with brake fluid. Do not allow the master cylinder to run dry and use the proper type of brake fluid. Continue this until you have a full firm brake.
Now, when you let off on your brake pedal, there's a spring that returns the pedal to the top. Make sure this spring is working as it should. It should return the pedal all the way back and hold it firmly in that position. Also there is an adjsutment of the brake rod that goes to master cylinder. It should be adjusted so that it allows the piston in the master cylinder to return fully to the rear position and then have a bit of slack. If it keeps the piston from fully returning, the brakes will drag. If the piston does not return fully as it should, the master cylinder needs rebuilding.
Good Luck
Steve
10,000 miles is about the life expectancy on the rear pads. By failing, do you mean the rotor is warping?
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