Exactly, the vaccum assist module only holds so much vaccum either the engine off. Also, if you leave the car parked for more than a day or so, the vaccum will eventually leak and you'll effectively have an unassisted brake pedal for the initial press before the engine fires up. This is actually true for all cars with vaccum assisted brakes, but since the stinger actually has a fairly tight brake fluid loops (less rubber hoses for expansion), it's more noticeable.
The vaccum booster isn't designed to hold vaccum for long when the car is off, that being said, from morning to evening, it should be able to hold enough pressure, there might be a minor leak, but as long as your pedal is not hard whole driving, it won't be considered outside normal operation
Thats actually incorrect, what you described is a leaking Master Cylinder (brake fluid circuit) The vaccum booster is a large circular casing case with a vaccum diaphram inside which acts as an assist to the brake force when you press on the pedal.
) is at a stop and the break is pressed with auto hold on, when I lift and re-press the break it stiffens. Once auto hold is turned off or the car is in gear the break can be pressed. Seems normal. I don't recall the break stiffening when I'm starting the car from cold though.
My bad, that’s right. That happened with my Bronco. I guess it would be the opposite then.
just had it happen this morning with my G70, and its happened 3-4 times before that in the 13 months Ive owned the car. No idea whats causing it, and I havent brought it up to my dealer. Everything seems ok though, no other symptoms or issues
Nope, the word is "not enough compressed air". My better drives Lexus, nothing like this even with no driving for weeks.
