Well here is the issue,
My ABS & TCS light comes on whenever I press the brake pedal (car running or not) and the rear brake lights arn't working.

So far I have replaced all the rear lights, lights come on when I turn them on just no brake lights.
Checked for obvious wire faults.
Tested the brake switch (under the dash) by keeping it in place and depressing the brake. Lights still came on.
Checked all fuses.
ABS sensors were not lose that I could tell

I'm running out of idea's and time and looking for some insight. thank's in advance for any help.

 

any ideas?

 

No, but I have this EXACT same problem. Only recently though my ebrake light is starting to stay on even when the ebrake is down.

My car started doing this after I rotated my tires. I rotated them back and the problem persists.

Going to put new pads in on Friday, hopefully that helps with the brake warning light at least. If it fixes my ABS/Traction light too I'll let you know.

 

have you changed any of the brake bulbs? I seem to remember a similar post related to using LEDs for light bulbs.

Best I got.

 

No led bulbs, all factory

LytHka let me know how it goes

 

Well I haven't installed my brakes but I was following this troubleshooting guide:

https://www.rx8club.com/series-i-trouble-shooting-95/have-abs-dcs-tcs-issues-lights-staying-202843/

Needless to say I found out why my ABS has been out for the past 2 months. I feel like an idiot now. Time to solder and electrical tape it.

 

^I already checked my wiring but that good you got yours figured out