Editing Anti-lock braking system (section)

===Anti-lock Braking System (ABS)===
''Piston Systems'': The pressure release in this system is realized through the movement of a spring-tensioned piston. When pressure should be released, a linear motor pulls back the plunger piston and opens up more space for the fluid. The system was used for example in the ABS I (1988) and ABS II (1993) of BMW. The ABS II differed in size and an electronically controlled [[Clutch#Friction clutches|friction clutch]] was mounted on the shaft instead of a plunger. Further [[Displacement measurement|displacement sensors]] record the travel distance of the piston to allow the control unit a more precise regulation. Honda also uses this system of pressure modulation for big sports and [[Touring motorcycle|touring bikes]].<ref>{{cite web|url=http://www.largiader.com/abs/abs2.html |title=BMW description of ABS2 |website=Largiader.com |access-date=2013-02-12}}</ref><ref>{{cite web |url=http://world.honda.com/motorcycle-technology/brake/p6.html |title=Honda Worldwide &#124; Technology Close-up |website=World.honda.com |access-date=2013-02-12 |archive-url=https://web.archive.org/web/20130819032525/http://world.honda.com/motorcycle-technology/brake/p6.html |archive-date=2013-08-19 }}</ref>

''Valve and Pump Systems'': The main parts which are part of the pressure modulation system are solenoid inlet and outlet valves, a pump, motor, and accumulators/reservoirs. The number of the valves differs from model to model due to additional functionalities and the number of brake channels. Based on the input of the ECU, coils operate the inlet and outlet valves. During pressure release, the brake fluid is stored in accumulators. In this open system approach, the fluid is then brought back in the brake circuit via a pump operated by a motor that is felt through pulsation on the brake lever.<ref>{{cite web|author=Matthias Becker |url=http://www.biat.uni-flensburg.de/msc/system/abssystem.htm#Grundkonzepte |title=ABS/ASR-Systemerklδrung |website=Biat.uni-flensburg.de |access-date=2013-02-12 |archive-url=https://web.archive.org/web/20130422102905/http://www.biat.uni-flensburg.de/msc/system/abssystem.htm |archive-date=2013-04-22 }}</ref>