Brakes, dimming lights

[Deano96GS]

I notice when i am stopped<BR>and i press the brake hard, the dash lights dim, and the engine drops a touch in rpms<BR>then if i release again ( not fully cuz the car stands still ) then push down again, they dim again and the rpms drop down, then pick up right away, is somethign wrong with my alternator? HELp me out guys<BR>thanks <P>------------------<BR>Deano, 1996 Black GS

[mendel00985]

What's happening is that when you hit the brakes, you actuate the brake booster which operates off engine-created vacuum; the result of this is a "vacuum-drop" until the system balances out...regarding the dimming lights when the brakes are hit; the drop in the aforementioned vacuum situation, causes the engine speed to drop, SLOWING the alternators RPM's too. I hope this answers your question-if not, let me know. Later...Manny

[Deano96GS]

Yes! that was Perfect, thanks for the detailed description. Is this something i should get checked out? or is this just a normal thing?<P>------------------<BR>Deano, 1996 Black GS

[mendel00985]

It'll happen in any car w/ power brake boosters.