More brake pressure when heat/ac is on???

[Stangman]

Noticed when i use my brakes normally it takes me a while to slow down, feels like they are grabbing good, but like fading at the same time... :dunno:

But when i have my heater on its like my brake booster is stronger and i stop a hell of a lot better... is this a sign of a booster going bad? i took off the check valve once and tried the blow trick in each end, it checked out... any ideas... this is really bothering me... and i want to narrow it down before i replace parts... thanks!

[Katmandu]

Sounds like you may have a vacuum leak near the fan selector switch. Stick your head under the dash with the car running and see if you hear any hissing.

[Katmandu]

Sounds like you may have a vacuum leak near the fan selector switch. Stick your head under the dash with the car running and see if you hear any hissing.
Turn the vent selector switch around while your listening under there.

[Stangman]

cool thanks... ill give it a shot...