Bled hydroboost - now the brake warning light is on - Ford Powerstroke Diesel Forum
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Old 11-13-2011, 12:50 PM
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Bled hydroboost - now the brake warning light is on

I bled my hydro boost system - by unplugging the 3/8" line behind the master cylinder and rotating the steering slowly and pushing the brake pedal down slowly and refilling with synthetic ATF V over and over until the fluid ran clear - I was careful to not let air in the system and now my brake warning light is on? I also have some brake pedal surge at low speeds?

Any suggestions would be appreciated. I'm guessing I need to rebleed the system but I was careful to follow the instructions and not let the resevoir go dry, so I'm at a loss why I would have a problem?

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Old 11-14-2011, 03:43 AM
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Well I tried the All-Data bleeding technique, wheels in the air, cap off, lock to lock 40-50 times. My brake light is still on? Any thoughts?
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Old 11-14-2011, 04:00 AM
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we just replaced a hydroboost on a camper that came into our shop our master tech said to NEVER bleed the old fasion way.... idk he said it would bust the hydoboost .... anyway he made me turn the wheel left lock right lock about 10 times till the squeal from the ps pump whent down. he said it was a self bleeding system you only had to bleed the brake fluid...->>> and then he used a vacume bleeder.... but the trick on a hydroboost system is it has to be running for this method... good luck
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Old 11-14-2011, 04:03 AM
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Why did you bleed the system in the first place? Which brake warning light is on, the red one that comes on with the parking brake?
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Old 11-14-2011, 09:22 AM
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Sorry - my first post should have said I was flushing my hydro-boost, not bleeding it.

I did get this issued resolved. An old timer told me to smash the brake pedal hard and hold it, then start the truck. 2nd time was the charm.
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