Chrysler Repair: brake booster failure in below zero temps, north dokota, vacuum line

Question
when i press on my brake i hear a air coming from it into the car. now this only happens when its left out side for more than 8 hrs when the temp is below 0 degrees. i live in north dokota and this is my 1st winter here. i called the mechanic and was told it is my brake booster and will need to have it replaced, and that my check engine light will come on and the brakes will get harder to push.

well that all happen. only whe the temp drops below 0 when im at work my car is outside for 8 or more hrs and when i 1st try to leave when pressing the brake it wont move and i here the air and the check engine light is on. now when i dont go to work and my car is in my garage this doesn't happen. no air sound no check engine light and the brake is not hard to push. could the problem be weather related? will getting a block heater solve this without replacing the brake booster.

Answer
Hi Dwight,
A block heater would not heat up the brake system.
The brake booster is a self-contained unit so there is not much to do about maintenance/servicing it, but it could be that it is not the unit itself but rather the vacuum hose between the unit and the intake manifold that is opening up as the temperature drops. So I would suggest that you examine that large hose: any fittings that branch off of it (for example you might have a vehicle that uses a branch off the same vacuum line that goes thry the firewall to operate the air distribution doors in the cabin so you could be hearing a leaky fitting under the dash on the right side of the a.c./heater housing), the clamps on each end of it, and inspect the hose carefully at the clamps and along the length for significant cracks. If after you do that you still experience the failure then replacing the unit is the only solution.
Roland