How do you bounce your car on gtA V?

To bounce your car in GTA V, you need to use a vehicle with a suspension that can be adjusted, like a lowrider. First, enter the vehicle and then hold the handbrake (usually the space bar on PC or the right trigger on consoles) while tapping the acceleration button rapidly. This will cause the car to bounce up and down as you control the throttle. Additionally, you can use the hydraulics feature if your lowrider is equipped with it, which allows for more precise bouncing.