Abstract
Jack-knifing of articulated vehicles is usually caused by the locking of the tractor rear wheels when brakes are applied. A method of preventing jack-knifing is to use an anti-locking braking system to ensure that these wheels do not lock. This report describes the results obtained when such a system, incorporating the Dunlop Maxaret Anti-locking Device, was fitted to the rear brakes of a tractor unit. The anti-locking system completely prevented the tractor rear wheels from locking, and jack-knifing, which occurred with the standard.