[shorod]

Did he check all four wheels, just the front two, just the rears, just the left side, right side?

If the rears were the only ones that were hot, then I'd suggest he make sure he didn't have the parking brake on by accident. Also, rear drum or disc brakes? If drum, make sure there isn't a leaky wheel cylinder or improperly adjusted set of brake shoes. If disc, replace the rotors and install new brake hardware along with new rubber brake hoses.

If just the fronts were hot, then I'd suggest the same as above for rear disc brakes (new rotors, new hardware, new rubber brake hoses).

Flush and bleed the brake system once the new hoses are installed. This should be done every 1-2 years anyway.

He may have a brake hose or two that has collapsed and is acting like a one-way valve. He applied the brakes while driving, but the collapsed hose did not allow the caliper to release all the way, so the pads were dragging. This dragging caused severe heat to build up at the high speed, which in turn caused the rotors to warp. The warped rotors and not released brake calipers caused the vibration in the steering wheel.

These symptoms could also occur if the brake hardware is corroded and not allow the caliper to float freely.

Either way, considering how hot the braking system must have gotten, the safe way is to replace all hardware, pads, rotors, rubber hoses, and flush the system.

-Rod