brakes

[danny_l_2005]

I can't figure out whats wrong with my car. I just noticed this today a while back. Well I have my car on and if I pump the brakes several times and a little fast the idle starts going up and down in between 600-800rpm. The only things Im thinking might be the problem would be the brake booster, systems needs to be bled, or ISC. Can someone help me out on this thanks

 

[toomey200]

try and check and make sure you have enough brake fluid and the resivor i filled. if it is low or empty when you press the petal it would be putting strain on the hydrolic piston for your brakes might cause your rpms to drop. do your brakes still work? do they catch towards the floor or sort of at the top?

 

[underradar92]

When you pump the brakes, since they operate on vacuum, the engine sees that as a vacuum leak and responds by increasing rpms. Its normal.

 

[danny_l_2005]

The reservoir is full. Yea maybe its normal. I just get freaked out when I find something new about my car. But I do think that the ICS might be shot because its should leave the idle at 750. And well at time my idle is at 750, then later after driving the idle is a 900-1100.