For some reason, when I push my brakes with the car in park, my idle will raise slightly. Just wondering why this is? Thanks.

 

Your brake power booster uses vacuum to assist the foot pedal. When you apply the brakes, some of the vacuum from the reservoir (large black drum behind the master cylinder) is bled off to assist the braking. The engine vacuum is used to replace the vacuum, so th edrop in vacuum is also experienced by the intake manifold. If the power booster allows too much air or requires too much vacuum, the drop in vacuum will act like a small vacuum leak and raise the idle slightly. It may be normal on a car with a smaller engine, but shouldn't normally occur on a V-8 or larger 6. If it does, it can be a sign of the brake booster failing.

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Later,
Vader
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All my life I've been searching for something. Something never comes - never leads to nothing...

 

So if it happens on our v8's its not a good sign? Mine did that awhile back. It seemed to stop after I replaced all my vac. hoses...
Justin