Toyota Repair Problems? Ask a Mechanic for Answers ASAP
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changing the brake fluid is normal service usually done around 50k. when the brake job was done, they should have felt the calipers wer not moving easily if they were bad at that time. there is also slides on the calipers that have to be serviced as well and can cause the calipers to stick. I would return to the original shop that performed the repair and let them check there work and see what they have to say. there is no way the rotors should be warped in that short period of time.
I would start there.