WHERE IS THE BRAKE SENSOR LOCATED ON THAT CAR M.B.S320 1998

Not brake sensor but brake switch can cause that, its located behind the brake booster in the engine compartment, make when you apply brake your lights comes on, if they don't come on then you have a bad switch or a blown brake fuse and this will cause the gear lever locked in park

The park brake sensor is located above the brake pedal and their are two sensors beside each other.I think the top one is the one that's bad I think it's a blue in color.That sensor is for your cruise control and park brake

The brake light issue isn't likely the the brake switch (since it sounds like your other brake lights are working properly). It's likely a bulb in the third brake light. When the filaments get old they sometimes lose and regain contact as the car vibrates on the road. Change the bilbs and see if the problem goes away. If it doesn't, look for a bad wire connection around the third brake light. Also, have someone verify the third brake light isn't working from the back of the car when you see the alert, it could be a bad sensor.

Possibly has a bad wheel speed sensor or has a problem with the ABS control module and/or pump. Need to have the ABS codes pulled by a service center. Also, some auto parts stores can pull codes and may be able to pull ABS codes.

probaly got debris in wheel sensor take off wheels and blow out

It may be that the brake system is contaminated with moisture, rust, or both. Bleed out or purge out all old brake fluid as a precaution, use a hand pump vacuum unit if possible to purge old fluid if not available thoroughly bleed out the system. The other possibility is that one of the reluctor sensors located behind the rotor's splash guard may loaded with dirt or just be faultly, purchase an ABS reluctor pick up sensor for the wheel that you think might be the culprit and change it out.

you need a rear left circuit board. they come with new lights, and is generaly inexpensive20-30 dollars

bad front bearing/abs sensor The sensor is part of the bearing,or the wires are bad so that when you steer it open circuts and thinks the wheel is stopped. need to read codes or use a scan tool with live data to see which wheel the computer thinks is stopping. then look at that wheel for problems

I had a similar problem with my anti-lock brake.
One of the will wear down. I took it to the dealer, could not tell why.
Until one day the a brake light came on. It was a bad sensor. Replace the bad sensor and the problem went away.
The mechanic plug a portable instrument and drive the car around until he find out. (The brake light came on, then off.)
This anti-lock brake system is control by sensors and it one is not functioning properly then you have a problem.
I do hope this help you.

abs relay some times go bad