What is the reason for the continuous operation of the Encore brake electronic booster pump?
3 Answers
The reason why the Encore brake electronic booster pump keeps working is: insufficient vacuum degree of the booster pump or damage to the booster pump. Introduction to the brake booster pump: The brake booster pump, commonly known as the brake booster, is a vacuum chamber with a large diameter. Inside, there is a diaphragm with a push rod in the middle, dividing the chamber into two parts. One part is connected to the atmosphere, and the other part is connected to the engine intake pipe through a pipeline. Working principle: The brake booster pump utilizes the principle of the engine sucking in air during operation to create a vacuum on one side of the booster. This creates a pressure difference compared to the normal air pressure on the other side, and this pressure difference is used to enhance the braking thrust. Even if there is only a small pressure difference on both sides of the diaphragm, due to the large area of the diaphragm, it can still generate a significant thrust to push the diaphragm towards the side with lower pressure.
When driving an Encore, if the electronic brake booster pump keeps buzzing, I think there could be several possible reasons. The most common one is that the brake pedal position sensor is stuck or damaged, which mistakenly makes the system think you're continuously pressing the brake, causing the booster pump to keep working. Another possibility is that the booster pump's relay is burnt out or there's a short circuit in the wiring, leading to uncontrolled current and continuous power supply that can't be turned off. Additionally, if there's a leak in the vacuum line, the system will detect insufficient pressure and command the booster pump to continuously boost to compensate. Unstable battery voltage might also trigger this issue since the booster pump relies on electronic control. I've seen similar cases when repairing cars before. It's advisable to first check if the sensor connection points are dirty, rusty, or loose, or use a diagnostic tool to read the fault codes to identify which part is malfunctioning before replacing any components, to avoid unnecessary expenses. It's normal for parts to wear out over time with prolonged use, and regular maintenance can help prevent these minor issues.
My Encore had the same issue last year, where the power steering pump wouldn't shut off and made extremely loud noises. It turned out to be caused by a faulty brake control module. That module is responsible for sending stop signals - if there's an internal short circuit or software error, it may misjudge the demand and keep the pump running continuously. Abnormal wheel speed sensor signals could also trick the system into thinking the vehicle is skidding, requiring continuous braking. Aged or short-circuited wiring may cause uninterrupted current flow too. Sometimes circuit modifications or insufficient battery voltage can trigger this as well. I drove directly to the 4S shop for computer diagnostics, and the technician quickly identified the cause - replacing the module solved it. Reminder: don't ignore this problem, as continuous operation not only drains the battery but also accelerates wear on the power steering pump itself.
