Hi, guys, maybe you will be able to help me, with the answer. Lately, I had felt like my brake pedal is not firm, and actually able to press break all the way down, especially when AC is on. Is this connected? My AC so far works fine, although car makes strange noises when I go above 3000 rpm with my AC on. Break system appears to be full(in cylinder under the hood.)
Any ideas are appreciated!
Yuriy

 

Sounds like air in the lines, good bleed should fix it. Is it worse when it is hot, I guess so, you are running the A/C. Air bubbles in hydraulic lines will compress when the pedal gets pushed. If it is hotter, the air expands a bit, so can be compressed that much more.