When checking curb height on a car with torsion bars, the car should be checked on what type of surface?

To accurately check the curb height on a vehicle equipped with torsion bars, it is essential to perform the measurement on a level surface. A level surface ensures that the car is in a neutral position, without any inclines or declines that could affect the suspension components. This way, the measurement reflects the vehicle's actual ride height as it would sit when parked normally.

Using a level surface allows for precise determination of the vehicle's stance, which is critical for adjustments in the suspension system. If the check were conducted on a sloped or uneven surface, the weight distribution and suspension geometry would be altered, leading to misleading measurements of curb height. Thus, a level surface is the optimal choice for achieving an accurate reading.