What does EPC on tachometer stand for and on other side I have also a circle with triangle inside and inside the Triangle Exclamation sign

https://www.justanswer.com/audi/1qbl7-warning-light-showing-yellow-circle-triangle.html

The yellow triangle with an exclamation mark will typically be accompanied by a message explaining what's gone wrong. Hopefully it will be self-explanatory - such as a low reservoir for the windscreen washer system.

I recently purchased a 2005 Z4 (76,000 miles), and I just experienced the same thing (beep, then yellow Brake and Triangle Light (w/exclamation point/semicircle appears on dashboard). It is intermittent. Did you ever find a solution?

Look in your owners manual

Can also find those symbols on the internet

possibly bad driver

The "leaning triangle" light is the light signifying there is a fault with the traction system (STC) a quick scan with a scan tool will tell you exactly what the fault is.
The only other triangle light on these cars is the triangle with the circle and the exclamation point. Which is either Orange or Red depending on the severity of the issue. And what you described sounds like the STC light to me.

Hope this helps.

dealer only ,ABS -- encrypted software so you cannot read the fault

you have a brake fault

Check your owners manual, But I belive it is telling you the brakes need work. probly pads.

what does it mean when the epc light comes on in my 2001 volkswagon bettle