danloch Posted 5 hours ago Report Share Posted 5 hours ago Hi. 2008 limited fwd 132,000 miles. I started to hear a whirring pump sound from the back passenger side of my vehicle. Never noticed until a few months ago. It happens if the car has sat for a couple of days. If I get in and touch the brake pedal without starting the car it begins. If I keep foot on pedal it continues for around 5 seconds. If I take my foot off pedal it stops. I replaced the fuel pump but the noise continues. No symptoms but a mystery. Anyone have any idea? Thanks! Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted 2 hours ago Report Share Posted 2 hours ago My guess is the whirring sound you are hearing is probably coming from the car's ABS pump. When your car sits for a while, the hydraulic pressure inside the ABS system slowly bleeds down. When you get in and press the brake pedal, (even if the car is not runnung), this triggers the ABS control module to wake up, run a self-test and prime the system. The 5-second whirring you hear is the internal electric pump motor building hydraulic pressure. Taking your foot off the pedal cuts the electrical circuit, stopping the pump. Quote Link to comment Share on other sites More sharing options...
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