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Brake warning light

Tiny
PERLA1428
  • MEMBER
  • 2008 FORD F-350
  • 6.4L
  • V8
  • TURBO
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Brake warning light come on I park the truck next day. Mechanic say power booster and master cylinder are bad. I replaced both when the truck is off brake are good when I turn engine on pedal goes down to the floor. I cannot get the truck on gear with not pressure in brake pedal. Please help. My truck is a super duty diesel power-stroke 6.4L. Thank you
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Friday, November 2nd, 2018 AT 10:52 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,414 POSTS
Hello,

You must have the ABS valves opened using a scanner to get the air out. Here is a guide to help us see what is going on. Also, did he use a new master and bleed it on the bench?

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

and

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Please run down these guides and report back.

Cheers, Ken

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Sunday, November 4th, 2018 AT 11:35 AM

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