legacycentral bbs

Today I was sitting in my car while it was idling. I noticed my "Stop Lamp" light was on and pumped the brakes to see if I could get it to go out. While doing this I noticed my idle would drop to the point where my engine would stutter, almost as if it was going to die. When I would stop pumping, idle would level out.

I know the brake booster draws vacuum to assist the brakes. In a situation like this would it draw enough to offset engine operation? I didn't look to see if vacuum decreased but will check tomorrow.

I am thinking there is a reasonable explanation but haven't been able to find one. I also have video of this happening if anyone is interested.

Yes, if you continually pump the brakes the brake booster's vacuum draw from the engine could produce the drop in idle you described.

Thanks for the response Josh. Just wanted to make sure that was normal.