I have an 89 Mustang GT 5.0 my dash lights, control panel lights, parking lights go on when I push the brake pedal and go off whe I relese and I don't know why they are doing that this just started happening

 

Welcome to the forum, but have to say I've never heard of this one before lol.

I'd start a thread in the Tech section, that's where you'll get the help for this. But to start, I'd dive under the dash for starters looking for a wire rub thru, a loose wire somewhere, or something out of place.

I don't know if this car is new to you, but I've seen some pretty messed up fuse box's from PO's. Good luck

 

welcome

I'd check for some loose wiring somewhere.

 

Welcome to the forum.

I third looking for a loose / frayed / damaged wire.

 

I'll have to take the dash apart and start there

 

Welcome!

 

Do the brake lights work? I'd start there, look at all of the light sockets for rust, check all of the tail light grounds. Has this car every had a trailer hitch or had a third brake light altered?
I'd also look for any "aftermarket" wiring. It's nearly impossible for factory wiring to cause this problem.