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2. Relay valve - Wikipedia

   en.wikipedia.org/wiki/Relay_valve

   Relay valve. A relay valve is an air-operated valve typically used in air brake systems to remotely control the brakes at the rear of a heavy truck or semi-trailer in a tractor-trailer combination. Relay valves are necessary in heavy trucks in order to speed-up rear-brake application and release, since air takes longer to travel to the rear of ...

3. Air brake (road vehicle) - Wikipedia

   en.wikipedia.org/wiki/Air_brake_(road_vehicle)

   Truck air-actuated disc brake. An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to both release the parking/emergency brakes in order to move the vehicle, and also to apply pressure to the brake pads or brake shoes to slow and stop the vehicle.

4. Hydraulic brake - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_brake

   A hydraulic brakeis an arrangement of brakingmechanism which uses brake fluid, typically containing glycol ethersor diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. History. [edit] During 1904, Frederick George Heath, Redditch, England devised and fitted a hydraulic (water/glycerine) brake system ...

5. Non-synchronous transmission - Wikipedia

   en.wikipedia.org/wiki/Non-synchronous_transmission

   A non-synchronous transmission, also called a crash gearbox, is a form of manual transmission based on gears that do not use synchronizing mechanisms. They require the driver to manually synchronize the transmission's input speed (engine RPM) and output speed (driveshaft speed). Non-synchronous transmissions are found primarily in various types ...

6. Retarder (mechanical engineering) - Wikipedia

   en.wikipedia.org/wiki/Retarder_(mechanical...

   Retarder (mechanical engineering) Torque converter, opened, interior similar to a retarder. A retarder is a device used to augment or replace some of the functions of primary friction -based braking systems, usually on heavy vehicles. Retarders serve to slow vehicles, or maintain a steady speed while traveling down a hill, and help prevent the ...

7. Sprag clutch - Wikipedia

   en.wikipedia.org/wiki/Sprag_clutch

   A sprag clutch is a one-way freewheel clutch. It resembles a roller bearing but, instead of cylindrical rollers, non-revolving asymmetric figure-eight shaped sprags, or other elements allowing single direction rotation, are used. When the unit rotates in one direction the rollers slip or free-wheel, but when a torque is applied in the opposite ...

8. Automated manual transmission - Wikipedia

   en.wikipedia.org/wiki/Automated_manual_transmission

   Automated manual transmissions can be semi-automatic or fully-automatic in operation. Several different systems to automate the clutch and/or shifting have been used over the years, but they will generally use one of the following methods of actuation for the clutch and/or shifting: hydraulic or electro-hydraulic actuation, [12] electro-mechanical, [13] pneumatic, [6] [14] [15] electromagnetic ...

9. Master cylinder - Wikipedia

   en.wikipedia.org/wiki/Master_cylinder

   Master cylinder. In automotive engineering, the master cylinder is a control device that converts force (commonly from a driver's foot) into hydraulic pressure. [1] This device controls slave cylinders located at the other end of the hydraulic brake system and/or the hydraulic clutch system. As piston (s) move along the bore of the master ...