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# the pedal is applied, a metal rod pushes a valve against the diaphragm and allows atmospheric pressure to enter the pedal side of the chamber. With the master-cylinder side of the chamber still under vacuum, the difference in pressure creates the assistance or “boost” needed when applying the brakes.
#Whether you choose a single or dual diaphragm booster depends on how much brake assist your vehicle needs. A dual diaphragm offers the most assist, and is ideal on an all-disc system or a disc-drum combination. If you want to keep your vehicle's four-wheel drum system, then a single diaphragm booster would be ideal.
#The vacuum booster is a metal canister that contains a clever valve and a diaphragm. A rod going through the center of the canister connects to the master cylinder's piston on one side and to the pedal linkage on the other. Another key part of the power brakes is the check valve.
#Inspect the vacuum supply hose to the booster for kinks, cracks or other damage. Check engine vacuum at idle with a vacuum gauge. To test booster function once the reserve is depleted, hold moderate pressure on the brake pedal and start the engine. If the booster is working properly, the pedal will drop slightly.

We are making such videos for the purpose of education. In this we have tried to understand in simple language. If the laptop or OBD tool is not connecting to the car/Truck, the video will help you. Friends must watch the video till the end!

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