Squeal when push hard on brakes

[04expowner]

Hello, I'm a new exp owner, 04 EB 2WD. It has 112,000 miles and needs a new set of plugs, but my most pressing concern right now is that when I press hard on the brakes, either with exp moving or just parked, there is a squeal. The squeal continues while I hold thermal down and stops when I release it. I can get the pitch to change by adjusting the pressure on the petal. The brake petal is a little soft as well. I'm wondering about the brake booster or maybe the motor for the adjustable petals. Any thoughts on diagnosing this problem?

 

[GAINMOB]

When mine squealed I needed new pads…so I swapped for new rotors/pads…and the softness is the booster/master cylinder…went together on my 04


Holy Roller Christian Car Club (HRC3) National Member...

 

[toms89]

My first thought was to ask you if the wife was in the car but then you said it did when you were stopped as well....

I would guess there is a problem with your power brake booster. Maybe a leak in the diaphragm?!