Interior brake pedal squeaking

[waldo_2001]

Alrighty I have read that this is fairly common, when I push the brake pedal I get a squeaking sound almost like rubber bushings rubbing. I hear everything from replace the brake booster to just flush the fluid. Flushing is much cheaper for sure but not sure if it will fix the problem. The pedal really does not feel bad or soft.

What do you think
There is a TSB by mazda that just says flush the fluid. The car has 45k on it and is a 2004 Wagon

Thanks
James H