You should not use the parking brake if the brakes are very hot because:

They can warp.. Section 2.16: Hot drums can warp if the parking brake clamps down on them as they cool.

You should not use the parking brake if the brakes are very hot because:

ANSWER BREAKDOWN
  • A. Correct. Hot drums can warp if the parking brake clamps down on them as they cool.
  • B. Incorrect. "They will cool too fast." is not correct. Hot drums can warp if the parking brake clamps down on them as they cool.
  • C. Incorrect. "The air will leak out." is not correct. Hot drums can warp if the parking brake clamps down on them as they cool.
  • D. Incorrect. "It is illegal." is not correct. Hot drums can warp if the parking brake clamps down on them as they cool.