The Chief (92635B) The roller units used for the EWJ 92635B brake tester are of an extremely high quality. The chassis are fully hot dipped galvanised. The roller surfaces are ribbed for a long lasting, effective friction co-efficiency. The roller units are fitted with very accurate pull/push electronic transducers for measuring the brake force. Notice the double pre-stretched chains used for these roller units. They ensure dependable and trouble-free operation for a very long time. A weighing system can be fitted, which enables the brake tester to calculate the vehicle’s total retardation. Specifications: Measuring range: 0-30 kN or 0–40 kN Power supply: 575V 3N/PE 60Hz AC. Roller unit: Motors: 11/13 kW/40 amp Roller diameter: 200mm Roller length: 1000mm Axle diameter 70mm Drive over weight: 20 tons Chassis surface treatment: Fully hot-dip galvanised Motor brake Electric .