Can Anyone Help????

[bisman69]

I own a 2002 Expedition XLT 5.4L. My brake pedal drops at a red light or stop sign and my master cylinder has been replaced. They bled all the air out of the system. What could it be? Power booster failing?

 

[bisman69]

I own a 2002 Expedition XLT 5.4L. My brake pedal drops at a red light or stop sign and my master cylinder has been replaced. They bled all the air out of the system. What could it be? Power booster failing?

 

[timothyfleming]

ive ran across this problem too. I know i first suspected air in the lines or a fluid leak, the master cylinder can also leak internally. its probably not your power booster. I would replace the pads if they are wore down. I don't know why but it worked for me.