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单词 brake servo
释义

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brake servo
b. More fully brake servo. A device or mechanism in a motor vehicle which reduces the amount of pressure the driver has to apply to the brake pedal. Cf. servo brake n. at Compounds 2.One of the most common types of brake servo uses the vacuum produced by the vehicle's engine or a vacuum pump to provide additional force when braking.
ΚΠ
1924 Motor 7 Oct. 448/3 The servo actually trebles the braking effect usually obtainable for a given pedal pressure.
1959 Times 1 Sept. 12/2 The..company have now introduced a vacuum-hydraulic brake servo which can be fitted easily to cars and light motor vehicles and is claimed to make a vast improvement in braking.
1989 Pop. Sci. Aug. 16/3 In the absence of engine vacuum, BMW developed a special mechanical brake servo.
2005 A. Bonnick & D. Newbold Pract. Approach to Motor Vehicle Engin. & Maintenance (ed. 2) vii. 191/1 The servo is the device which allows the driver to apply a large braking force by the application of relatively light force from the foot.
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