What is the reason for the constant rattling sound when holding the brake in D gear?

[IrisLynn]

The reasons for the constant rattling sound when holding the brake in D gear are: 1. Poor performance of the release fork shaft and too small clutch travel; 2. Excessive viscosity of transmission oil and excessive wear of the synchronizer; 3. Degraded performance of the clutch pressure plate and reduced working performance of clutch oil due to temperature influence. The gears of an automatic transmission car include: 1. P gear is the parking gear, used for long-term parking of the vehicle; 2. R gear is the reverse gear, engaged when the vehicle needs to move backward; 3. N gear is the neutral gear, engaged when the vehicle is parked for a short time without turning off the engine; 4. S gear is the sport mode, making the vehicle drive more sporty; 5. M gear refers to the manual mode, where gear shifting is done manually by the driver when the gear lever is engaged in M gear.