The purpose of proportionating valve in a braking system is to limit the amount of pressure to the rear drum brakes to prevent rear wheel lock-up during rapid stops.
The purpose of metering valve in a braking system is to prevent brake fluid movement to the disc untill a specified psi has built up in the syatem (72 - 125 lbs)
Purpose of telescopic gauge in a motor vehicle garage is its used together with outside micrometer for measuring diameters of small holes, or width of slots, grooves etc.
The purpose of safety ridge near the lips of a tyre rim is to prevent the tyre from moving into the drop center of the rim when the tyre blows and thus coming off the wheel.
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