Hard brake pedal? - Ford Powerstroke Diesel Forum
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Old 01-22-2014, 01:58 AM
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Hard brake pedal?

Okay I'm not used to hydroboost but I have a feeling I'm about to learn something about it.

Over the last week or so I've noticed my brake pedal getting progressively harder, so far my brakes are working normally but the pedal just seems to be getting stiffer.
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Old 01-22-2014, 04:41 PM
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How is you power steering feel in the truck, is the pump whining or hard to steer, the hydroboost runs off the power steering pump
Usually when the truck has a hard brake pedal do to a pressure problem it falls in the power steeering pump first, but I have also replce the hydroboost system behind the mster cylinder due to it leaking also
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Old 01-22-2014, 06:02 PM
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PS pump is ~1 year old... steering feels mostly fine, sometimes a little stiff when trying to turn at a stop ( 37" tires this is common and always did it)

The brakes work fine, just, take a little bit more effort than they used to
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Old 01-22-2014, 06:50 PM
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The arm hooked to the pedal under the dash is it wet or showing residue, dirt sticking to it?


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Old 01-22-2014, 06:55 PM
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I'll look in the morning
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Old 01-23-2014, 05:07 PM
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How did it look


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Old 01-23-2014, 05:21 PM
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No leaks that I can find anywhere.. pedal looks good on both sides of the firewall... it's worse the first few minutes of the drive but then loosens up a little bit
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Old 01-23-2014, 05:35 PM
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I wonder if cold temps and old brake fluid is your trouble. Since you say it loosens up when it gets warmer. When power steering fluid warms up it would be weaker. Try changing fluid/bleeding brakes. I would say unbolt master cyl from boost, leave lines hooked up and just pull it out a bit to see if theres any fluid in there.


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Old 01-23-2014, 05:41 PM
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I doubt its the fluid, all of it is less than a year old ( flushed with new PS pump), and I flushed all the brake fluid about 6 months ago when I had a line blow out on me...

I will check for leaks though
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Old 01-23-2014, 08:46 PM
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What did you use for a power steering pump (new/rebuilt, cheap/moderate to expensive) have had some ford rebuilt P/S pumps take a crap 6mos. to a year later. Some rebuilt pumps only put in the parts that went bad and then internal other parts go bad, have found that when it comes to hydro-boost systems a new pump is worth the extra money or a real quality re-manufactured, have had a lot of problems with cheap rebuilds
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