HydraulicbrakeFromWikipedia,thefreeencyclopediaHistoryFredHYPERLINK"http://en.wikipedia.org/wiki/Duesenberg"\o"Duesenberg"Duesenbergoriginatedhydraulicbrakesonhis1914racingcars.Thisbrakingsystemcouldhaveearnedhimafortuneifhehadpatentedit.In1918MalcolmLougheed(wholaterchangedthespellingofhisnametoLockheed)developedahydraulicbrakesystem.ConstructionThemostcommonarrangementofhydraulicbrakesforpassengervehicles,motorcycles,scooters,andmopeds,consistsofthefollowing:HYPERLINK"http://en.wikipedia.org/wiki/Brake_pedal"\o"Brakepedal"BrakepedalorleverApushrod(alsocalledanactuatingrod)AHYPERLINK"http://en.wikipedia.org/wiki/Master_cylinder"\o"Mastercylinder"mastercylinderassemblycontainingaHYPERLINK"http://en.wikipedia.org/wiki/Piston"\o"Piston"pistonassembly(madeupofeitheroneortwopistons,areturnspring,aseriesofHYPERLINK"http://en.wikipedia.org/wiki/Gaskets"\o"Gaskets"gaskets/HYPERLINK"http://en.wikipedia.org/wiki/O-rings"\o"O-rings"O-ringsandafluidreservoir)ReinforcedhydrauliclinesHYPERLINK"http://en.wikipedia.org/wiki/Disc_brake"\l"Calipers"\o"Discbrake"Brakecaliperassemblyusuallyconsistingofoneortwohollowaluminumorchrome-platedsteelpistons(calledcaliperpistons),asetofthermallyconductiveHYPERLINK"http://en.wikipedia.org/wiki/Brake_pad"\o"Brakepad"brakepadsandaHYPERLINK"http://en.wikipedia.org/wiki/Rotor_(brake)"\o"Rotor(brake)"rotor(alsocalledabrakedisc)orHYPERLINK"http://en.wikipedia.org/wiki/Drum_brake"\o"Drumbrake"drumattachedtoanaxle.ThesystemisusuallyfilledwithaHYPERLINK"http://en.wikipedia.org/wiki/Glycol_ethers"\o"Glycolethers"glycol-etherbasedbrakefluid(otherfluidsmayalsobeused).Atonetime,thepassengervehiclescommonlyemployeddrumbrakesonallfourwheels.Later,discbrakeswereusedforthefrontanddrumbrakesfortherear.However,becausediscbrakeshaveshownbetterheatdissipationandgreaterresistanceto'fading'andarethereforegenerallysaferthandrumbrakes,four-wheeldiscbrakeshavebecomeincreasinglypopular,replacingdrumsonallbutthemostbasicvehicl