If, when driving a truck, you notice that the vehicle pulls to one side only when you apply the service brake, what is usually the cause?

Question

DentroTest · Accepted Answer

When a heavy vehicle tends to drift toward one side of the roadway only when the brake pedal is pressed, the main reason is an imbalance, or asymmetric braking, between the wheels of the same axle. If one wheel brakes harder or more effectively than its counterpart on the opposite side, a turning moment is generated that pulls the truck's path toward the side of the wheel that brakes more. The other options make no technical sense: fuel injection plays no part in the power steering or in the brakes, and engine oil lubricates the internal mechanics and has no hydraulic connection with the wheel cylinders of the brakes.

If, when driving a truck, you notice that the vehicle pulls to one side only when you apply the service brake, what is usually the cause?

Want to pass the Permit C and C1 (English) theory test first time?