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How to Adjust the Vacuum Booster?

2 Answers

LaMaverick

07/29/25 5:32pm

Cars' vacuum boosters need adjustment. You can connect the vacuum tube on the vacuum booster, start the engine, and let it run at idle speed. Wait for the vacuum booster to enter normal working conditions, then measure its values. More details are as follows: 1. The vacuum booster uses vacuum to increase the force the driver applies to the pedal. It is generally located between the car's brake pedal and the master cylinder. 2. For ease of installation, it is usually integrated with the car's master cylinder as a single unit, with part of it extending into the vacuum booster's housing. The car's vacuum booster mainly consists of a vacuum servo chamber and a control valve. 3. When the driver presses the brake pedal, the control force from the pedal mechanism pushes the control valve push rod 12 and the control valve plunger 18 to move forward.

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DelGrant

08/14/25 8:40am

I recently checked the vacuum booster in my car myself, mainly because when it fails, the brake pedal becomes very hard, making driving quite strenuous. First, I opened the engine hood and located the vacuum hose connected to the brake master cylinder, feeling for any air leaks by hand; if there's a hissing sound or the hose is aged, it needs to be replaced. Then, I checked whether the engine's vacuum supply was stable, which can be measured with a vacuum gauge—normal readings should be between 20-30 inches of mercury. If all these are normal but the booster still doesn't work, it's likely that the booster itself is faulty and needs to be replaced entirely. Not all cars allow direct adjustment of this component, as most are designed to be fixed. Tampering without proper knowledge could affect the braking system, so it's best to refer to the vehicle's manual or look up information online to ensure safety first. Regular maintenance, such as cleaning the hoses, can extend the booster's lifespan.

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