brake pads rubbing against disc when brakes are not applied

hi, i have a less than 3 yr old 2003 nissan altima. it has about 20k miles in it and already the brake pads have worn out so much so that the brake metal touched the disk rotor. had to replace disk rotors for the rear wheels. spent about $500.

with the new brake pads i noticed that the brake pads were still touching the disk rotor even when the brake is not applied. i can hear slight sound of brake pad rubbing against the disk rotor while driving at 3 mph. the mechanic said its normal. is this true!! won't this cause the brake pads to wear out faster, also abrade the disk rotor.

the mechanic also said that the caliper is not clamping the disk rotor equally on either side of rotor and suggested me to change the caliper. it costs $200 each and i decided not to get it changed at this time. i want to go to a dealer and find out if it can be covered by the warranty. the car is less than 3 yrs old. the warranty booklet doesn't say anything about caliper, but does mention brake pads and disk rotors are not covered. infact i think its because of the bad caliper that i had to replace disk rotors. any idea if a bad caliper can be replaced under warranty.

-thanks very much msm

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smahesh
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