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Mercedes Benz S420 Vacuum Supply Pump

Commom Causes of Problems with the Mercedes Benz S420 Vacuum Supply Pump

Without your car's vacuum supply pump, your brakes and A/C system won't be able to perform their tasks efficiently. Your vehicle's vacuum supply pump is the one responsible for providing suction that would put the car's power brakes to work. It's also the one that gets rid of moisture from the A/C and ventilation system. That is why it's important to make sure that your Mercedes Benz S420's vacuum supply pump is always at its best condition. Here are a couple of things to take not of when you start noticing problems with your Mercedes Benz S420 vacuum supply pump.

The brakes become harder to push than usual

For the power brake to function correctly, it needs the suction provided by the vacuum pump. A vacuum pump failure will cause the brakes to become much harder to push than usual. The power brake booster will stop working properly as it will lose the right brake boost. When you start to notice that your brakes are getting harder to push, this could be a sign of a vacuum pump that's beginning to fail. Check them immediately to see what remedy it needs or if it needs to be replaced.

The pump loses suction

If you feel weak or no suction at all when you place your finger over the hole on the vacuum pump while the engine is running, this is a sign of a problem in your vacuum supply pump. This problem usually requires a replacement. However, if you feel that there is a strong suction in the pump but the braking power is still not working properly, it would be best to check the entire system if there are leaks and other forms of damages with the components around the vacuum pump.

Oil is leaking from the vacuum pump

When you notice oil leaking from your car's vacuum pump, this could be a sign of bad internal seals. The most common area for these leaks is the vacuum system around the oil filter housing. Make sure to check other locations as well and do a meticulous inspection for loose, cracked, or missing vacuum lines and fittings. You should also listen carefully and watch out for hissing or whistling sounds as these may indicate that there is air coming out.

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  • How to Keep Your Mercedes Benz S420 Vacuum Supply Pump In Top Condition

    Your car's vacuum supply pump does a lot of important jobs. It provides enough suction to put your vehicle's power brakes to action. It also helps you stop your car comfortably by helping compress the air in your power brakes. Aside from that, it also provides power and suction for the A/C and ventilation systems to get rid of moisture. So before your vacuum pump starts to break down, make sure to maintain it on a regular basis to avoid problems and to prolong its life as well.

    • Keep the vacuum supply pump clean
    • Cleaning your Mercedes Benz S420's vacuum supply pump on a regular basis will help it stay in good condition and prolong its life. You may do this by completely disassembling or removing it so you can clean the internal parts that need to be cleaned. You may use mineral spirits with a degreaser as a cleaning agent. You can also use it with a wire brush and a little elbow grease. Just make sure to clean the mineral spirits off once the parts have been cleaned because these mineral spirits produce vapor pressure that is higher than the ultimate vacuum of the pump.
    • Test the vacuum lines regularly
    • For proper operation, your Mercedes Benz S420's air conditioner, heater, and cruise control depend on reliable vacuum lines in your vehicle's vacuum supply pump. Make sure that there are no leaks in any of the vacuum lines. Otherwise, one or more of these components might not be able to perform efficiently or not work at all. That is why it's important to check and test the vacuum lines regularly. This is a relatively easy task that requires simple tools. All you have to do is disconnect the vacuum hose from the coupling closest to the unit. Then attach the plastic hose of the vacuum gauge to the nozzle at the end of the plastic hose. Start the car, let the engine idle, and check the gauge. Make sure that it reads read 14-18 inches of vacuum. If the hose failed to deliver 14-18 inches of vacuum, remove the vacuum line and inspect it for cracks or breaks.
    • Always watch out for leaks
    • Always pay attention to your vacuum supply pump as it has tendencies to leak. Some sure signs of a leak in the vacuum include subtle hesitation at your attempt to accelerate, stalling, and idling. A high-pitched squealing noise is also another sign of a leakage in your vacuum pump. That is why it's important to always check under the hood where the vacuum leak is. That includes doing a visual inspection on the vacuum hoses, intake manifold gaskets, connectors, and plastic lines to make sure there is no sign of damage such as softening, collapsing, and cracking.