Quick hydroboost question
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Laughing Gas
Joined: Aug 2012
Posts: 920
Likes: 20
From: Malheur Co. OR
Quick hydroboost question
For those of you who have mounted a hydroboost in a '78 and earlier F-150 with the bell crank for the vacuum booster, did you remove that bell crank and mount the hydroboost directly to the firewall, or mount the booster to the existing brackets? I have searched several times and have found one pic of someone using the bell crank which will put the booster and MC way into the engine compartment.
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Laughing Gas
Joined: Aug 2012
Posts: 920
Likes: 20
From: Malheur Co. OR
Ok. My only concern with that is keeping the cancel switch for the speed control. Since the existing pushrod on the pedal is flat bar essentially and the hydroboost is round stock I can't do the trick of cutting the ends off and threading them to add a sleeve. I can weld the two together but once I do that the pedal is at a fixed height. I'm trying to think of a way around that, maybe a long pushrod from a '79 booster?
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Laughing Gas
Joined: Aug 2012
Posts: 920
Likes: 20
From: Malheur Co. OR
Possibly, I read through several over the last few months. I will have to look again.
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Laughing Gas
Joined: Aug 2012
Posts: 920
Likes: 20
From: Malheur Co. OR
That one I have read through a few times. That is also partially where my question comes from. Post 99 on that thread shows the hydroboost with the bell crank setup. I will have to look closer at my truck and maybe compare it to my brothers '79. I haven't started tearing into the brakes yet as I am gathering parts still.
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Hotshot
Joined: Sep 2012
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From: Calgary
I think it was Psychloplath that did a conversion but he may have used a GM product for a donor. I'm going to do the conversion on my 78 and have a 88 F450 for a donor, everything is in 1 piece still and I'm not unbolting anything til I actually start it but can mess with the pedal in the cab if need be as that wont expose the system to the elements. can take whatever pics you need if it helps, my pedal system for both trucks are for a standard so they may be different from an auto.
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Laughing Gas
Joined: Aug 2012
Posts: 920
Likes: 20
From: Malheur Co. OR
I think I'm going to go junkyarding next weekend so I will look for a F superduty, I have only seen one in the yards before. So you didn't have to change the pushrod? The pedal ended up in about the same place? I have to be able to make my brake cancel switch work for the speed control.
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Laughing Gas
Joined: Aug 2012
Posts: 920
Likes: 20
From: Malheur Co. OR
So I forgot to post up how I solved my problem. I measured 20 times, cut twice. Then I had a coworker with a mill at home make a notch. I ground the pushrod down to a tight fit with the correct distance from the firewall to the front of the pedal hole. Welded the assembly together. After some initial teething problems the brakes have been working well.
Logistics Pro
Joined: Aug 2003
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Sorry I missed your question earlier this year. For future reference, no I didn't experience any changes in the pedal location.
What did your HB come out of? I have an astro one sitting in a box, saving it for a future project, I guess.
What did your HB come out of? I have an astro one sitting in a box, saving it for a future project, I guess.
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