Run the l shaped flashing up under the bottom row of siding so that it tucks under the final bottom row and on top.
Flashing where siding meets brick.
It might be buried behind the siding where you can t see it.
There should already be a metal flashing that is sealed to the brick.
Details like this risk rot and insect damage to the structure.
How to use flashing between brick siding 1.
Step flashing is used where a roof meets a wall to cover the junction of those elements preventing leaks.
Uniform building code section 1402 2 exterior openings exposed to the weather shall be flashed in such a manner as to make them weather proof.
Maybe in this case the flashing extends upwards behind the building siding forming a zee shape that might reduce this risk.
If the transition exceeds 10 feet in length it s necessary to use more than one piece of.
Pieces of 18 inch wide flashing installed prior to the brick work but on top of the house wrap in a stepped fashion periodically laying on top of the lapped upper portion of the siding to get the water back to the exterior of the wall is more along the lines that i would be thinking of.
The metal flashing placed on wall top slopes back towards the building directing water inside the structure.
Install the flashing before you finish the top of the brick wall as the flashing must go behind the siding as well.