Right side bulb might be blown.
the brake back side left side light does not work when brake the RV
The brake light switch is located beneath the dashboard. The switch is on the left-hand side of the drivers side.
Check the bulb.
On the left side of the brake underneath the dash
with the park lights on both left and right side are lite. but when the brake is applied the right brake lights up and the left goes out(doesn't light up)
you have to take off the panel that is covering around the brake and then you will see the brake light switch on the front side of the brake you can just simply turn it left or right and that will adjust it
The 1994 Toyota Camry emergency brake light switch can be found beneath the drivers side dashboard. The emergency brake light switch will be beneath the far left hand side of the dashboard.
Left I/P Junction Block on left side of dash.
The brake light fuse is in the fuse panel below the dash on the left side of steering column.
Number 7 fuse on the right brake light in the trunk fuse box number 5 for the left side brake light also in the trunk.
Assuming you have disc brakes, it could be, a sticky or stuck brake caliper on the left side brake. Grease or brake fluid on the friction surface on the left side brake. A restricted brake hose/line on the left side brake. Air in the hydraulic lines on the left side brake.
check your local mechanic