Hydroboost not working
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Cross-Country
Joined: Nov 2025
Posts: 54
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Hydroboost not working
I am looking for help with my 2002 f350 7.3 truck. I replaced my frame and everything worked great except my brakes. Not sure they ever worked properly. Power steering works great, but when you are driving straight I have no boost to the brakes. I know this because I connected a pressure gauge to my front caliper (500-700 psi same pressure withe the truck off) if I turn the wheel all the way left or right I get 1900psi. Obviously the steering knuckle is blocking flow and the pressure backs up to the hydroboost piston giving me good braking. This also charges the accumulator so I might get a good brake on the straight once. I have used clear lines on both returns so I know I don't have bubbles floating around. I have changed the pump and hydroboost with the parts truck and now with anew reman set. Symptoms are the same. I am getting ready to change the hydroboostagain but I am very frustrated and I am hoping there is a better test procedure or better info. I have scoured the internet.to no avail. Thanks for any light on the subject.
Last edited by Simclardy; Nov 8, 2025 at 07:35 AM.
Thread Starter
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Cross-Country
Joined: Nov 2025
Posts: 54
Likes: 8
Fixed
This probably won't help anyone, but I had the hydroboost pressure lines reversed. I went to hook up the pressure/ flow tester and realized the mistake. For what its worth
Last edited by Simclardy; Dec 28, 2025 at 05:45 PM.
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