2001 explorer sport trac

[Aye]

Soft pedal and now I hear a hissing sound when I press the brake. We bled my brakes Multiple times still same issue with very little brake and it's very soft. Is it my cylinder, booster, vacuum?

Thanks in advance

 

[1.8TTony]

Soft pedal would be unrelated to the hissing from under the dash

Hissing would be a bad brake booster.

Replace the booster first and properly bleed the brake system.

 

[koda2000]

Hissing sound when pressing the brake pedal would indicate a bad power brake booster. If the system was completely bled there's no reason to bleed it again after replacing the brake booster. If you ran the brake system dry while bleeding you've gotten air in the ABS system. It is very difficult to get the air out of the ABS without special equipment.

 

[Aye]

Thanks you guys I'll try the boost. I made sure not to let the system go dry I didn't want those problems lol