Here within the last couple of weeks, I've been getting some whining noise comming from my PS pump ONLY when setting at a stop light with my breaks applied. As soon as a I remove my foot from the pedal, it stops. No noise when steering, just breaking. Fluid level is good, and everything seems to be working fine. Is the pump just getting weak or what? Steering works good, and so do the breaks. It doesnt do it everytime or even every day, just once in awhile. Any ideas?? Thanks.