Is It Harmful to the Car to Hold the Brake in D Gear at a Red Light?

[DelGianna]

Holding the brake in D gear not only increases fuel consumption but also causes significant damage to the vehicle. Here are the relevant details: 1. Integration: When the transmission is in D gear, the internal gears of the transmission are integrated with the wheels. However, since the brake is engaged, the wheels are locked and cannot move, preventing the transmission gears from moving as well. Meanwhile, the engine continues to operate normally, directing all its power to the torque converter. The pump wheel of the torque converter rotates at high speed with the engine, while the turbine remains stationary, placing both components in a state of complete slippage. 2. Load: Both the engine and transmission are under certain loads. To prevent stalling, the engine increases fuel injection. Prolonged operation of the torque converter in this slipping state leads to a rapid rise in transmission oil temperature.