That brake rod adjuster is between the booster and the master cylinder. That may be something the manufacturers eliminated as a cost cutting feature on the newer vehicles, I don't have anything newer then a 04 and I have not taken the master cylinder off the booster on that ride.
You may want to keep an eye on the drilled hole to be sure it doesn't start spitting out brake fluid into the engine compartment. The last I heard, brake fluid is still effective at removing paint from everything.
I completely understand the “paint Removal” with brake fluid. Bin there done that 😂😂😂 The hole I drilled is about 1/64”. Not big at all, but I will be monitoring for a while. The channel in the master cylinder cap is much larger than the hole I drilled.
