I have a 98 6cxl 4x4 and I have never flushed the brake system. The truck hs 150,000 miles and the pedal is very soft. I am going to replace the pads and rotors but was curious about having firestone or someone do a powerflush to change the fluid too. SOmeone at the local delaership told me that flushing can cause grit and rust in the brake system to get caught in your caliper seals and ruin them thus causing even more expense for the whole operation. Any opinion on having this done to a truck with so many miles? Thanks in advance