Kinetic energy = (1/2) · (mass) · (speed)²
= (500 kg) · (speed)² .
At 25 m/s, KE = (500 kg) · (25 m/s)² = 312,500 joules
At 15 m/s, KE = (500 kg) · (15 m/s)² = 112,500 joules
The transmission and the brakes had to soak up and get rid of
(312,500 - 112,500) = 200,000 joules.
That's a lot of energy.
You paid good money to buy the gas that supplied the energy.
Sadly, when you mashed the brakes, and the brakes turned
all that kinetic energy into heat, and all that heat blew away
in the wind, you didn't get any of your money back.