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Unlike air brakes, where a valve is opened and air flows into the lines and brake chambers until the pressure rises sufficiently, hydraulic systems rely on a single stroke of a piston to force fluid through the system. If any vapor is introduced into the system it will compress, and the pressure may not rise sufficiently to actuate the brakes.
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The purpose is to reduce failures in hydraulic braking systems of motor vehicles which may occur because of the manufacture or use of improper or contaminated fluid. The standard applies to all fluid use of passenger cars, multipurpose passenger vehicles, trucks, buses, trailers and motorcycles equipped with a hydraulic brake system. [1]
The most common vehicle uses of master cylinders are in brake and clutch systems.. In brake systems, the operated devices are cylinders inside brake calipers and/or drum brakes; these cylinders may be called wheel cylinders or slave cylinders, and they push the brake pads towards a surface that rotates with the wheel (this surface is typically either a drum or a disc, a.k.a. a rotor) until the ...
Banjo fittings are commonly found in automotive fuel, [2] motor oil and hydraulic systems (e.g.: brakes and clutch). General applications include: Hydraulic power systems; Power steering fluid; Variable valve timing systems; Brake caliper connectors [1] Turbo charger oil feeds; Fuel filter connectors [3] Carburetor connector [2] Hydraulic ...
Sequence valves control the sequence of hydraulic circuits; to ensure that one hydraulic cylinder is fully extended before another starts its stroke, for example. Hydraulic circuits can perform a sequence of operations automatically, such as trip-and-reclose three times, then lockout, of an oil-interrupting recloser .
Without relay valves, it would take too long for sufficient air to travel from the brake pedal valve to the rear of the truck or trailer in order to apply the rear service brakes concurrently with the front service brakes, resulting in a condition known as brake lag. To correct this condition on a long-wheel-base vehicle, a relay valve is ...
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