My brakes are pulsating when i turn a corner

high speed and heavy braking will produce a pulsation in the pedal
that is the abs working properly and the pulsations are the brake release and reapplying
intermittent abs light indicates a wire or wheel sensor problem at one of the wheels

A good place to start is the brake light switch.
There are 2 circuits in there: 1 for the brake lights and the other for the car computer (ESP, Engine brake etc...)
If the brake switch has an intermittent fault, the EPS light may come on and the car may run rough until you stop the vehicle and remove the key. It then re-set itself until the next time you are using the brakes and the fault appears again.

Check the level of your brake fluid or your brake pads may be worn down and time to have them checked out.

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 pump
• 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.

As ESP is a safety feature I would have it looked at by a garage.
ESP is a system that affects several systems in the car braking and steering as well as power, traction and dynamics. This is to stop the car from losing control on a slippery surface or a tight corner and reacts faster than the reaction time of the driver.

i believe thats a tune up issue- plugs wires

brake pulsation is caused by warped brake rotors, not sure the ABS light and the pulsation are related, The ABS warning light requires a scanner to be connected and to read the fault code that is stored when the ABS warning light is turned on.

The "pulsating" you refer to is Normal for a vehicle with ABS (Anti-Lock Brake Systems). It keeps the vehicle braking in a straight line and monitors each wheel with a sensor as to how fast it's turning while braking. The "pulsations" you feel is the ABS Computer turning each individual brake on and off to prevent a lock-up or skid. Perhaps if you road test the vehicle and apply your brakes lightly as in coming up on a stop sign in a residential neighborhood, you'll feel what you consider to be, "normal braking." Pulsations usually come at higher speeds and as to how much pressure you're putting on the brake pedal. You're safer than most now knowing that braking, even in snow, rain or gravel, that your vehicle will stop in a straight line instead of sliding to one side or the other.

If unhappy with ABS Braking, you can always remove the fuse to the ABS computer rendering it inoperative, so you have both choices as to what you'd like to do, right here.

I hope this helps,

~00 Buck~

"Still Living on the Right Side of Dirt..."

The pulsating sounds like rotors warped from overheating. As far as light goes, may be float or sensor at master cylinder faulty & making light trip.

I had the brake light switch replaced by a local dealer. Cost was $140 and it fixed the problem. Have driven the car for two weeks since and no lights and all systems normal.