Just throwing things at the wall, I might suggest looking along the mechanism/pedl/etc where you put the brake on. There may be a switch which is pressed or released along that mechanical "lever" which is not making good contact and not openiong closing when it should. This is something I have seen on other RV.
Look for some smallish item that has wires atttached that may flop around as it is loose?
They come in lots of different shapes!
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!