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By certification 
This type of axle with ABS system :
An anti-lock braking system (ABS) is a safety anti-skid braking system used on aircraft and on land vehicles , such as cars, motorcycles, trucks and buses.[1] ABS operates by preventing the wheels from locking up during braking, thereby maintaining tractive contact with the road surface.
ABS is an automated system that uses the principles of threshold braking and cadence braking which were once practised by skilful drivers with earlier non-ABS braking systems. ABS operates at a very much faster rate and more effectively than most drivers could manage. Although ABS generally offers improved vehicle control and decreases stopping distances on dry and slippery surfaces, on loose gravel or snow-covered surfaces, ABS may significantly increase braking distance, while still improving steering control.[2][3][4] Since ABS was introduced in production vehicles, such systems have become increasingly sophisticated and effective. Modern versions may only prevent wheel lock under braking, but may also alter the front-to-rear brake bias. This latter function, depending on its specific capabilities and implementation, is known variously as electronic brakeforce distribution, traction control system, emergency brake assist, or electronic stability control (ESC).
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