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Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21630
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My 2005 Mercedes ML 500 W164 has started self braking! ABS

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My 2005 Mercedes ML 500 W164 has started self braking! ABS light comes on and brakes come on! What's going on? How can I fix it please?
Submitted: 1 year ago.
Category: Mercedes
Expert:  Shantal-Mod replied 1 year ago.
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Expert:  Matt replied 1 year ago.
hello to get the brakes to come on then its very likely then the ABS main pump is faulty as it should never trigger like this unfortunately as this is an expensive part so I'd suggest the next action is to get the car plugged into a diagnostic device as this will pull off the fault code to point to the issue and may confirm if the pump needs replacing or not
Customer: replied 1 year ago.
Yes, had had it diagnosed now. Break off side speed sensor
Expert:  Matt replied 1 year ago.
Hello I'd first check the connections at all four corners first for any signs of corrosion or chafed wiring.The sensor is located in the wheel hub so you'll have to remove each wheel in turn to inspect them all.Also check that the toothed wheel that the sensor points to is clean and free of any debris.you can check each sensor's function by plugging the two output wires into an AC voltmeter and spinning the wheel quite quickly, you should get a voltage signal that increases with rev's. Its possible that the fault is only a bad connection to one of the wheel sensors.This may be remedied by removing each wheel in turn and unplugging each sensor and cleaning the contacts with a squirt of electrical contact cleaner. Then refitting.
Customer: replied 1 year ago.
Ok, thanks gor that
Expert:  Matt replied 1 year ago.
glad to helpBear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you
Expert:  Matt replied 1 year ago.
Hido you still need help?Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21630
Experience: BEng hons Mech engineering, in auto industry 22 years
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