Most MUs are powered either by traction motors, receiving their power through a live rail or overhead wire ( EMU ), or by a diesel engine driving the wheels through a gearbox or hydraulic transmission ( DMU ).

Most modern production engines use hydraulic lifters to automatically compensate for valve train component wear.

Most bicycle brake systems consist of three main components: a mechanism for the rider to apply the brakes, such as brake levers or pedals ; a mechanism for transmitting that signal, such as Bowden cables, hydraulic hoses, rods, or the bicycle chain ; and the brake mechanism itself, a calliper or drum, to press two or more surfaces together in order to convert, via friction, kinetic energy of the bike and rider into thermal energy to be dissipated.

Most moving hydro-mechanical components cycle at 0-50 Hz, but entrained gas bubbles resulting in a foamy condition of the associated hydraulic fluid results in actual hydraulic cycles that can exceed 1000 MHz even if the moving mechanical components do not cycle at the higher cycle frequency.

Most sidecars are also fitted with steering damping devices, of either friction or hydraulic type, to lessen the effects of sudden inputs, as encountered on rough roads, upon the vehicle's handling.

Most vehicles with automatic transmissions cannot be started this way because the hydraulic torque converter in the transmission will not allow the engine to be driven by the wheels.

Most of the first civilizations in history, such as Ancient Egypt, Ancient Somalia, Sri Lanka, Mesopotamia, China and pre-Columbian Mexico and Peru, are believed to have been hydraulic empires.

Most hydraulic brake systems are sealed from the outside air by a rubber diaphragm in the reservoir filler cap, but the Citroën system had to be vented to allow the fluid level in the reservoir to rise and fall, thus it was not hermetically sealed.

Most Buell two-cylinder engines utilize computer controlled ducted forced air cooling ( variable speed fan that only activates as required ), two valves per cylinder, a single throttle body, zero maintenance hydraulic valve actuation, and zero maintenance gear-driven cams.

Most hot extrusions are done on horizontal hydraulic presses that range from.

Most systems employ eddy current, oil hydraulic, or DC motor produced loads because of their linear and quick load change abilities.

* Most hydraulic automotive power steering control valves.

Most CPT rigs are heavily ballasted ( 20 metric tons is typical ) as a counter force against the pushing force of the hydraulic rams which are often rated up to 20 kN.

Most notable of these was a switch from pneumatic to hydraulic brakes.

Most pits are designed as a hydraulic lift system that can be raised and lowered as needed.

Most modern light trucks and passenger cars have one master cylinder for the brakes which contains two pistons ; but many racing vehicles, as well as some classic and antique cars, have two separate master cylinders, each with only one piston ( much like hydraulic clutches typically have only 1 piston per master cylinder ).

Most power steering systems work by using a hydraulic system to steer the vehicle's wheels.

Most presses utilize a hydraulic ram in order to produce sufficient force during the molding operation.

Most irrigation sprinklers operate through electric and hydraulic technology and are grouped together in zones that can be collectively turned on and off by actuating a solenoid-controlled valve.

Most hydraulic fuses detect this flow and seal themselves if the flow exceeds a predetermined limit.

Most notably, it had a simple recoil mechanism where the barrel recoil was absorbed by hydraulic cylinders and then the barrel was returned to its firing position by a spring that had stored some of the recoil energy.

Most landing gear are operated by electric motors or hydraulic actuators.

Most battles, and thus most fortifications, were concentrated in the hilly regions of the north, as the vast Arabian or Syrian Desert ( Roman Arabia ) separated the rival empires in the south.

Most chapters are Imperial Courts and are also known as " empires ".

Most articles and categories about empires should be categorized under: Category: Former empires.

Most contemporary historians still agree that it is unlikely that any of the recorded emperors existed until about five hundred years after Suijin's reign and about a millennium after Jimmu's recorded reign.

Most military accidents took place while clearing the minefields in the immediate aftermath of the 1982 conflict or in the process of trying to establish the extent of the minefield perimeters, particularly where no detailed records existed.

Most of these races have advanced technology but existed hidden from humanity until recent times.

Most extinctions have occurred naturally, prior to Homo sapiens walking on Earth: it is estimated that 99. 9 % of all species that have ever existed are now extinct.

Most impressively, miniatures and matte paintings could be used to depict worlds that never existed.

Most recent developments in CSCL have been called E-Learning 2. 0, but the concept of collaborative or group learning whereby instructional methods are designed to encourage or require students to work together on learning tasks has existed much longer.

Most people who died went to Mictlan, although other possibilities existed ( see " Other Destinations ," below ).

Plans existed to nominate Riverview High School to the National Trust for Historic Preservation's list of the most endangered historic structures in the United States, America's Most Endangered Places.

Most residences lay within Towson proper: no houses existed west of Central Avenue along Allegheny or Pennsylvania avenues, and there were only three homes along the West Chesapeake Avenue corridor.

Most of the Strauss works that are performed today may once have existed in a slightly different form, as Eduard Strauss destroyed much of the original Strauss orchestral archives in a furnace factory in Vienna's Mariahilf district in 1907.

Most scholars would take this as an indication that the-pronunciation existed in the dialects of these authors.

Most existed with few possessions as they were limited by what they could carry.

Most of the texts had been printed previously, from 1559 onward ; but Newton's version of Thebais is new, and earlier printed texts of Studley's versions of Hercules Oetaeus and Hippolytus, if they ever existed, have not survived.

Most historians agree that there existed distinct forms of music in the Arabian peninsula in the pre-Islamic period between the 5th and the 7th century AD.

Most of these rituals existed long before the germ theory of disease, and figure prominently from the earliest known religious systems of the Ancient Near East.

Most railroad companies that once existed have either closed, been assimilated by a larger company, or participated in a " merger of equals " in which neither company's name survived unaltered ( an example of the latter being the Burlington Northern / Santa Fe merger, which produced the Burlington Northern and Santa Fe Railway ).

Most of the piers that once existed in lower Manhattan fell into disuse or were destroyed in the last half of the 20th century, although a number have been adapted to new uses.

Most of these problems had already existed in some form during the 1970s, and the government had introduced several measures intended to correct the deficiencies.

Most of the songs on the album are about " specific situations that I've had where love has existed and ultimately failed ," Groban told The New York Times, adding: " And other songs are about the quest, and it just not working out.

Most were popular melodies that had existed for years.

Most CACW bases existed near the boundary of Japanese-Occupied China and one " Valley Field " existed in an area within Japanese-held territory.

Most of the New York boundaries were ignored in favor of the New Hampshire boundaries and designations once Vermont achieved statehood, and some of these New York patents are now referred to as paper towns because they existed only on paper.

Most of the settlement occurred within a decade after construction, and at one time a plan existed to shorten the interior supports to level the floors but this was never carried out.