1157's arent dual filament. the LED versions of the 1157 arent desgined for dual voltage use like a dual filament bulb is.

that's why when you step on the brake, they work... but dont work with just the parking lights on.

this is also why you shouldnt deviate between bulb numbers unless you're positive they're constructed identically or are authorised as interchangeable.

you need LED equivalents of your stock number bulbs so you get the dual voltage fuction back to run the parking lights.