Since the advent of dependable disc brakes for trucks, the demand for drum brakes has steadily diminished. This trend is likely to continue, not least because disc brakes are lighter, have more consistent high level of performance, and are easier to check and maintain.

However, the operating conditions associated with the construction industry make drum brakes the favoured option for many operators. And there are certain specifications of vehicles supplied by Scania that only offer drum brakes.

Current availability of drum brakes is on any tractor or rigid with a high chassis (mandatory), optional on all normal height chassis with steel/air or all-steel suspension, and no availability with low or extra low chassis.

Scania has maintained development of drum brakes in conjunction with ABS in order to ensure that braking performance meets the needs of construction companies. Routine maintenance at each wheel is limited to three grease points. Inspection apertures enable checking the condition of the brake shoes.

Drum brakes are robust. By their nature, they are well-equipped to operate effectively and reliably in muddy, dusty, wet and sandy conditions; this is why they are preferred over disc brakes for off-road applications.

However, they offer no other advantages. They are heavier – typically on each rear axle between 27 to 60 kgs, adding up to 120 kgs to a three axle truck.

Over time, it is likely that technical solutions will be adopted to make disc brakes more suited to the off-road environment. Even so, drum brakes will always be offered where they give functionality, performance and reliability up to customer expectations and in line with regulatory bodies.