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Old 04-21-2014, 03:13 PM
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Serious Brake Issues

Truck is an 08 Job 2 F250 Spartan, full exhaust, intake, egr delete, studs, 6 inch lift on 37s

So a couple weeks ago I was driving home and my power brakes and power steering went out. The pedal would engage brakes but wouldn't return to normal position after I let off. I had to pull it up with my foot. On the way home my power steering pump started making a awful noise.

So far I replaced the power steering pump and put it together. Still no power brakes or power steering. Got a P0703 code, input circuit B, and did a little searching and figured out it was the front most sensor in the master cylinder was bad. So I replaced that, and the power steering is back and so is the power brakes, but the brake pedal still won't come back on its own.

So now, the pedal is really hard when first pushed on then goes soft and goes to the floor. The brakes stay on and truck won't move until I pull the pedal up with my foot. Also can hear a bit of a hissing noise under the dash, like fluid flowing threw a restricted hose. Still getting the P0703 code and also getting a trailer brake module fault on the dash screen.

Truck has a integrated Trailer brake in the master cylinder. Could the master be gone shooting that message and the P0703 code along with messing the brakes up?

Or could the brake booster be out causing the brakes to mess up? But no explanation on the code and trailer brake message.

Anyone have any info that could possibly help me? Thanks guys.

Cory Anderson
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Old 04-30-2014, 08:27 AM
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BRAKE BOOSTER IS THE ONLY PART OF THAT SYSTEM THAT CAN EFFECT BOTH THE POWERSTEERING AND BRAKES. THAT'S WHERE I WOULD START.
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Old 04-30-2014, 09:42 AM
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Air in the system.
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Old 05-09-2014, 06:02 AM
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Hydroboost, known problem....I bet if you go under the driver dash and look where your brake pedal is connected to the firewall....you will see a small piston / Hydroboost...it will be leaking.
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