I replaced the calipers rotors and pads in the front and rear on my 2001 F350 Powerstroke. I replaced the front about a week before the rear, and after bleeding the pedal felt great. As soon as I replaced the rear, the pedal would get hard during bleeding, but as soon as I started the truck the pedal falls to the floor no matter how many bleeds I perform. Im also hearing a hissing noise when the brakes are applied and I know that can be related to the master cylinder failing, or a bad brake booster. But since the pedal felt fine before I did my rear, im wondering if something else could fix this rather than replacing my master cylinder. Any thoughts?

  • You sure all the calipers were installed in the correct positions? Bleeders up? – Ben Apr 28 '19 at 19:37
  • Have you tested the brake fluid for moisture, and made sure that there isnt a leak leading into the brake booster – hello moto Sep 29 '19 at 16:27

Assuming you are bleeding in the correct order, usually furthest first, closest last, then perhaps you need to go to a shop that uses a power bleeding machine - some vehicles are very challenging to bleed.

  • Yeah I bled them in the correct sequence furthest from the master cylinder – Sam Apr 28 '19 at 15:13
  • @hellomoto no, I have not tested the brake fluid for moisture... Do you think I should or do you think the OP should? – Solar Mike Sep 29 '19 at 5:55
  • @hellomoto you made a comment to me as in my post... you should consider replying to the original post not an answer... – Solar Mike Sep 29 '19 at 14:28

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