Bleed the brake lines

You most likely have air the brake lines. You need to bleed the brake lines to restore pedal height.

You have to bleed all four corners on all
vehicles every 2 years

Brakes have to come apart every 9 months
or one year at the most, to remove rust,lube
all sliding parts & whatever other service is needed

i don't think you can bleed rack and pinion it is a loop systeminone way and out the other.

Yes and No...Replacing the master cylinder is a good idea, however, giving the vehicle that much pressure with old lines attached may blow out the old rusted lines. If you are going to replace the master cylinder, you may just want to replace the brake lines as well.

rear brake lines 3/16" front brake line 1/4"

are the lines like /// or wavy?? could be the car had factory fog lights /// or could be headlight defroster (didn't know it was available on a stang)

should be a bolt where the hose enters the front caliper. just unhook and replace with new one. Be forewarned. When you change out the lines, you need to bleed the brakes as well.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/matthew_d24b835e574ef6ca

jumper the low pressure switch on the Acc. if the AC runs, check the charge on the A/C if the charge is correct. replace the LPS.

how many miles are u getting on a set of brake pads before they wear out? Have u flushed out the lines? Contaminated brake fluid can ruin the calipers, causing internal corrosion which in turn causes the caliper to drag and burn out the pads prematurely. The strange thing w/ this theory, is the fact that it's just one wheel. I would try bleeding all the lines though, to make sure u have bled all old fluid, and replaced it w/ new. Has the mustang ever been in an accident? Just wondering if caliper mounting bracket is tweeked, or some other component that the brake system is mounted to. Let me know if this is any help, and if not, if u have any more clues that might help figure this out. Good Luck

yep this is a two man job, onece you get air in the lines is better to do all four, my has abs and i was able to do it, but next time don't take anylines lose just turn the piston clockwise and you should be able to push it in.