what could it be?i have a mini me y8 on b7.i'm idling like 900 on idle then if i press the brakes it goes down to 500.even though i have the full b7 swap its still the same so i think the mini me is not the one to blame.help pls.....

 

brake booster is proly bad, or at least the diaphram inside the booster...do you hear a vacuum leak from under the dash when you push the brakes?

 

i dont hear any vaccum leak.yup thats what i'm thinking the booster.thanx bro...