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Brake light switch problem may cause the ESP / BAS lights to illuminate.
Common symptoms of a bad
Mercedes brake light switch.
Car stuck in Park.
ABS ESP ETS lights come on.
Can not move the shifter from Park to Drive.
Brakes Defective Warning on Instrument Cluster
Car won't shift gears. Stuck in 2nd gear, limp mode.
Brake lights don't work. (Brake light switch can still be defective even if the brake lights work. Checking the brake light operation is not a good test.)
ESP, BAS, ABS lights turn on. Car won't shift properly. Stuck in gear.
TEST: To test your new brake light switch: Turn you car off to reset the ABS light. apply the parking brake. and start the car in neutral or park without using the brake. if the problem is the brake light switch... the light will only come on when you press the brake pedal.
If you replaced the brake light switch and the light is still on you should check a few other things such as:
Fuses and Relays
ABS wheel speed sensor
Brake Fluid Level
Get an advanced scanner to read trouble codes.
NOTE: ** You may need a MBZ scan tool to reset the error code which was stored in the ECU because of the bad brake light switch.
Does ABS work properly? Get on dirt road and try to lock brakes (do this carefully insuring no police car tailgating,lol) Could be bad wheel speed sensor. Check codes with scan tool capable of reading ABS and trans codes.
When the ABS comes into play from heavy braking you will feel a pulsating of the brake pedal under your foot. This is the brake pressure, on off on off as the wheels stop start stop etc. The ABS will not control the vehicle direction but by allowing the wheels to turn under brakes and not lock up you have control of the steering and the direction the vehicle goes.The ABS will not stop you quicker and in fact on ice or loose surface the distance to stop will be increased. As I said all the ABS does is give you steering ability under brakes.. Take the vehicle to an accredited brake shop and have the ABS tested if you feel that it is no operating properly
abs light means anti lock brake system and the light is telling you that they aren't working properly. you still have brakes it just won't be with the anti lock system your vehicle has. you will need to have your brake system checked out.
if abs light is on it means your abs system is not working properly due to disconnection of sensor of any wheel or problem with abs module but it dosn't mean that your brake will not work it will work but it will work like non abs brake , car wheel can get lock while sudden braking, don't worry but drive carefully, thanks.
it is a failed wheel bearing.the hub and bearing comes with an abs sensor and when the bearing could not be located by the sensor it will turn on the abs light and make the car skip when braking.check to see if your not missing any brake fluid and that the truck is still able to brake.if all is good then change the faulty wheel bearing.if you dont want to invest right away just disconnect the connector for the abs to the bearing.braking will feel normal and youll just have the abs light on.
What you will need to do is have the system scanned for codes. Your local Auto Zone or Advanced Auto will scan the vehicle at no cost for you. Write the code numbers down and reply back.
When both lights come on, it is indicating one of the ABS sensing components is not operating properly. Your base brakes will be fine, however the ABS function will not work properly. No danger of base brakes not stopping the vehicle.
My guess at this point would be a wheel speed sensor faulty, but again, only a guess until you get the codes scanned.
Get the codes and let me know.