Brake Booster bleed off overnight?
I've had this 'issue' since new and now with the recall I'm wondering if it is normal behavior for the Grand Cherokee, because it's not normal behavior for any other vehicle I have owned.
The brakes work fine while running (mostly), but after being parked overnight, the brake pedal is hard like all the vacuum assist has bled off.
I say 'mostly' above because I have had a few times where I've been accelerating up an incline (Twin Cities are not flat by any means) and had to stab the brakes because some jerk changes lanes without signalling and there has been no assist, the pedal was as hard as a rock. I know that under acceleration there would be very minimal vacuum available, but there should be a one-way check valve to ensure that braking boost is always available regardless of engine vacuum.
Doesn't seem right to me. If the system is designed to hold a vacuum, it should persist overnight.
Understand that I know that if you press on the pedal a couple times without starting the engine the level of assist drops off with each press of the pedal, but mine is 'hard' right away.
Just wondering if anyone else has this 'issue'?