I get break waning light on when engine is not warmed up.
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Bradley Jordan
233 days ago
**Bradley Jordan**
**Nissan, Subaru, and Infiniti Master Technician**
**ASE Master Tech All Makes**
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Customer
233 days ago
Hi
Bradley Jordan
233 days ago
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.
Customer
233 days ago
I checked full
and even had a break fluid service. It was the first thing I did.
Bradley Jordan
233 days ago
I would have it checked for codes in the [abs](/topics-abs-mercedes/) then.
Customer
233 days ago
No fault code in ABS
Bradley Jordan
233 days ago
Then I would check the fluid sensor for the master cylinder.
Customer
233 days ago
It's ok - I disconnected it and still the warning light is on.
Bradley Jordan
233 days ago
let me check, whether it is a closed or open switch in the fluid sensor.
Customer
233 days ago
could pressure sensor bad when the engine is not warmed up?I thin it is closed switch
Bradley Jordan
233 days ago
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.
Bradley Jordan
233 days ago
**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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