Soft brake pedal after replacing brakes

2010 MERCURY MILAN
120,000 MILES • 2WD • AUTOMATIC
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DWANE WILLBUR
  • MEMBER
  • 1 POST
I replaced all four calipers, rotors, pads, and master brake cylinder.
Then bled the brakes with little to no pressure to the pedal. What am i doing wrong?
Thanks
Mar 17, 2019 at 2:38 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good evening,

You need to bleed the system with a scan tool. Once you replaced the master cylinder, air went into the ABS unit and the only way to get it out is with a scan tool to open the solenoids while you pressure bleed the system.

Air is trapped in the system.

Roy
Mar 17, 2019 at 5:11 PM
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