Brake Disc Rotor Problems of Lexus RX300

I took my Lexus 2000 because it shimmied badly. The dealer could not loosen the nut because the whole cylinder disc assy was rusted so badly that they have to saw it off. The brake pad could not even move, they have to change the arm that connect braking. I was never warned about this problem.

See all problems of the 2000 Lexus RX300 🔎.

Front brake disc rotors are warped at only 28000 miles.

See all problems of the 2001 Lexus RX300 🔎.

When braking there was a popping noise, and vehicle took longer to slow down. Consumer had to apply more pressure. This progressed to clicking and squealing associated with smell of fire, like rotors were grinding. Took to dealer, and they lubed the brakes, and pivoted points. This stopped the noise, but did not fix the problem. Consumer has continued to have the problem every 3000 miles. Please provide any further information.