Insufficient lubrication of vacuum pump leads to failure Analysis of BMW braking principle

The BMW (USA) official said on the other day that it will recall 25,000 vehicles whose brake system has malfunctioned, resulting in a problem with the brake system. Officially stated that the vacuum pump is not sufficiently lubricated, resulting in the use of brakes. The brake is a very important part of a vehicle, and the brakes are too hard indeed to cause the owner to use a little inconvenience, but for the BMW model, the relationship between the vacuum pump and the brake system is what, it is also played on the brake system What kind of influence is that Xiaobian wants to introduce to the majority of netizens.

According to reports, the BMW (US) recalled models are all equipped with 2.0L turbocharged engines. The braking systems of these models all have auxiliary assistant functions. The source of the boost is the vacuum pump equipped on the engine. The author also learned from the introduction of Mr. Liu, a professional after-sales service technician of BMW, that the BMW brake system has the help of the engine, which makes the entire braking system more flexible. The assistance required by the brake system requires the vacuum pump equipped on the engine to assist. The engine and the brake system are connected by vacuum tubes to complete the final work of the brake booster. According to Liu’s explanation, the gas required in the vacuum tube is generated under the continuous operation of the vacuum pump. In order to ensure the normal operation of the vacuum pump, the lubricating oil (oil) is an essential product.

The vacuum pump supplies the vacuum gas required for the brake boost, but as an ordinary working part, what is it to ensure its normal operation? Master Liu explained that the vacuum pump equipped in the engine needs a certain amount of lubricating oil to work smoothly. When the lack of oil lubrication in the vacuum pump works poorly, the gas in the vacuum tube cannot be supplied to the brake in a timely manner, providing a certain brake boost, and when the owner brakes in an emergency, he will find that the pedal is too firm and the brakes are more time-consuming and laborious.

Lubricating oil will certainly hinder the vacuum pump work, but it is not a big concern for owners. Master Liu indicated that the lubricant used in the vacuum pump is the oil used in the BMW vehicle. According to the BMW model maintenance regulations, it is necessary to change the oil every 10,000 kilometers, that is, when the owner of the car to the 4S shop to carry out routine maintenance of the vehicle, more than 10,000 kilometers It is necessary to change the oil for the vacuum pump in order to ensure the smooth operation of the next brake. (This recall is only for BMW's US region. There is no official proof in mainland China yet.)

Regular maintenance and replacement of engine oil may be forgotten by the owner due to busy work, but the BMW In-Vehicle System will provide double insurance (safety insurance) for the owner's healthy driving. Master Liu also introduced to the author that the car dashboard will show the lack of oil in the car, even if there is no time limit for routine maintenance, it can also provide tips for the owner. Of course, if the assistance disappears in an accidental situation, the BMW owner can also achieve the purpose of braking by manually braking or pressing the brake pedal. However, Master Liu recommends that each BMW owner must regularly visit the 4S shop to repair the vehicle and reduce vehicle failure. rate.

More vacuum pump information is available at China Vacuum Pump Trading Network (/).

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