|
Ok so I replaced worn rotors and pads, flushed the brake system, and replaced an oil leaking vacuum pump...launch control still didn't work.
I inspected the brake booster check valve and that was fine. I then went ahead to replacing the brake booster and master cylinder.
It turns out that the brake booster was on the path of complete failure. My guess is that the diaphragm inside the booster would start leaking after the brake pedal is pressed past a certain point. This might be the reason why the issue wasn't noticeable on normal driving. And probably why the BMW tech inspecting the car didn't pick up on the issue.
I'm happy to finally do LC and know how the braking of the car should feel like.
|