If both backlights work (red) both turning signal s work and both white backup lights work...only when press on brake, the driver side brake light dont work....take foot off brake doesn't work. Help

Ok so what your saying is that with the tail lights on and the brakes on the the left side (drivers) does not work but with the lights off the brake lights work fine or visa verse .....//you have a high resistance in the ground on the drivers side ....//it can handle the park light (its most likely dimmer on that side) but when the brake is added it is to much current for the circuit to handle ...check the circuit with an Volt /ohm meter ...it could be a socket or if you have trailer wiring harness it could be were the spliced it in ....// the ohm meter will help ...//most likely its corrosion so you may have more than one wire that is open