2005 Mercedes E-Class brake HUMMIMG noise

Belt pulleys can make that noise. So can crank bearings, right before they sieze up.

While I'm not overly familiar with Mercedes, I'd assume that it still has a brake light switch located on the bar of the brake pedal itself. This switch is typically just a "plunger" style switch, where when you push the pedal down as if applying the brakes, the plunger extends outward turning the brake lights on. When the pedal is released, as if letting off the brakes, the plunger is depressed causing the lights to shut off. If that plunger gets stuck in a depressed position, the lights will remain off at all times. Check that first, along with the brake light fuse and/or relay. Good luck.

have the abs module checked for codes to find out what the problem is.when the system detects a fault in the system it turns on the abs light and check the e-brake to make sure its all the way off.the humming noise sounds like its coming from the abs hydraulic unit that`s not shutting off.

no problem, the noise is your brake system... it has an electric motor to pressurize the brake fluid in order to optimize performance and fluid levels to all four brakes.

not a faulty rear sam more likely a poor bulb holder clean the area that the bulb sits in

check that the air filter is seated correcty in it housing, check for leaks or cracks on ducting fasteners and clamps

Brakes need replacing. Just take the wheel off and have a look see.

Hello;
Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
Thanks;
Rich
RPM Northwest

Hi there,
Try this. Start engine, pump brake pedal four times, depress brake pedal and try selector again.

I replaced the break light sensor that sits right behind the break pedal. the part cost something like USD$18.00 and it took 3 minutes to replace.