so new car, and I'm having a problem difficult to diagnose. first i drive the car home to find the driver rear brake smoking, take the caliper off and notice the calipers, rotors, pads are brand new but installed without the hardware. cleaned/ lubed everything reassembled and made it 40 miles no heat in the rotor then randomly starts smoking again. so i ordered the hardware and put it back together everything was fine for a mile then i feel the passenger rear rotor and was very hot. So the issue switched sides and it has me very flustered.
was thinking brake hose until it switched sides, maybe the hardline?
note the brakes are very quishy but i just bled them also the brake booster is new aswell and seems to function fine... sorry for the length, any ideas?