I get break waning light on when engine is not warmed up.

I get break waning light on when engine is not warmed up. Mechanic's Assistant: Have you checked the brake fluid? How's the level and when was it last changed? I had breakfuild service but still same problem Mechanic'...

I get break waning light on when engine is not warmed up. Mechanic's Assistant: Have you checked the brake fluid? How's the level and when was it last changed? I had breakfuild service but still same problem Mechanic's Assistant: What is the make/model/year of your car? Mercedes Benz 2000 C230 Mechanic's Assistant: Are you fixing your C230 yourself? What have you tried so far? I replaced parking break switch Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? I tested break fluid level sensor by disconnecting the sensor - no issues

Automotive Expert
**Bradley Jordan** **Nissan, Subaru, and Infiniti Master Technician** **ASE Master Tech All Makes** **Let me take a moment to review your request.** **_You may be prompted for a phone call, this is optional as the request is automatic._**

Automotive Expert
check the brake fluid it might be a little low, as the fluid warms it expands. with disc brakes wear the caliper piston stays a little further and the fluid needs to fill that space, it can be low without a leak.

I checked full and even had a break fluid service. It was the first thing I did.
Automotive Expert
I would have it checked for codes in the [abs](/topics-abs-mercedes/) then.

No fault code in ABS
Automotive Expert
Then I would check the fluid sensor for the master cylinder.

It's ok - I disconnected it and still the warning light is on.
Automotive Expert
let me check, whether it is a closed or open switch in the fluid sensor.

could pressure sensor bad when the engine is not warmed up?I thin it is closed switch
Automotive Expert
It could be a pressure sensor but that should set a code, check the parking brake switch. the wiring diagram shows it turns on the brake light.
Automotive Expert
**If you need more help, just follow up with your question and I can give you more information.** **it was my pleasure to help you today, exceptional service is my goal and I hope I provided** **Exceptional service for you today. Good luck with your repairs and have a wonderful day** **Thankyou** **Bradley**

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