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.
Purpose of yellow lines in a power mechanics workshop is;To mark out where a machine operator should stand when working with a machine.To identify pathways
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