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Remember we specified petrol engines get their vacuum from the motor? Well, this is because diesel-powered engines run a separate vacuum pump to generate their vacuum effect.Įven though diesel engines can create a vacuum (after all, they still suck in air), it isn’t as strong as what a petrol engine generates. Why Do Diesel Engines Need a Separate Vacuum Pump? The extent to which the valve opens is proportional to how hard you press onto the brake pedal. This will, in turn, push a lever that pushes the master cylinder piston. This allows the vacuum differential to move the diaphragm in the pressure boost cylinder to one side. In petrol-powered cars (at least naturally aspirated ones), the brake booster gets this power from a pressure differential it creates using the engine’s vacuum.Įvery time you tap on the brakes, a valve connecting the master cylinder to this vacuum source opens. It does this by getting some form of powered assistance from the car’s engine. How Do Brake Boosters Work?Ī brake booster is a power multiplier system that sits between the brake pedal and your master cylinder. It is designed in a fail-safe manner that lets you stop the car even if you lose your brake boost. You will feel as if the pedal is solid and unmovable. This saves you the pain of having to push really hard on the brake pedal to bring a car to a stop.Īn excellent way to test how much force you need to brake on your own is by trying the brake pedal with the car off. To prevent this occurrence, therefore, you must avoid any pressure on the brake line while attempting to separate the booster from the master cylinder.įinally, always remember to use appropriate clothing and eye protection.The vacuum brake booster is a loyal system that works behind the scenes to translate a gentle tap onto the brake pedal into a more usable force. This happens because the brake lines are directly attached to the master cylinder. It is possible to damage the brake lines while trying to separate the damaged booster from the master cylinder. Reconnect the vacuum line to the booster.Reposition and tighten all nuts previously removed to secure the newly installed booster.Position the new brake booster behind the firewall of the master cylinder. BRAKE BOOST VACUUM SYSTEM MECHANICAL FAILURE FREE
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