Brake warning light

2008 FORD F-350
150,000 MILES • 6.4L • V8 • TURBO • 2WD • AUTOMATIC
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PERLA1428
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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
Nov 2, 2018 at 10:52 PM
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STRAILER
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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

Nov 4, 2018 at 11:35 AM