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www.ColoradoClassicBroncos.com - View topic - One final (hopefully) Hydroboost question.
It is currently Mon Nov 25, 2024 8:34 pm



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 One final (hopefully) Hydroboost question. 
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Post One final (hopefully) Hydroboost question.
Everything is finally in and bolted up. The only problem I am having now is with pedal return after the brakes have been applied. I get a nice firm pedal all the way to braking. If I go full force I do get a little squealing out of the PS pump. Once I take pressure off of the pedal, I get zero return. It's almost like an emergency brake. I did install the guide pin and spring in the hydro, it just seems as though it does not have enough force to overcome the hydro piston. Brakes seem to engage at about 25-50% pedal down but do not disengage until nearly 100% pedal lift.

I'm thinking I need to do a lot more bleeding on the system. Wondering if any one else ran in to a similar issue with their install.

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1972 Sport, 302, 3 speed with old school Duff floor shifter, T shift Dana 20 with JB Fab twin stick, 4.11 gears with Trac-loc, Lincoln hydroboost, Chevy disc conversion, WH gas lift gate shock kit, 33" Duratrac tires on slots and about 2.5" of lift, Stroppe installed: bumper braces, dual shocks on all four corners, GM power steering, trans cooler mount, auto shift column, rollbar.

The Terrible One
1972 Sport uncut, 302, C4 with 1974 column , T shift Dana 20, 3.50 gears w/ limited slip, 1966 U13 Roadster kick panel, and factory power steering.

1973 Stroppe Baja project


Sat Jun 18, 2011 10:41 pm
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Post Re: One final (hopefully) Hydroboost question.
If I remember right with mine, make sure you work the hydraulic fluid through the system pretty good. Lift the front end up and turn the wheel from lock to lock 8-10 times, kill the engine, hit the brakes until the fluid in the reserve reservoir is drained and repeat a couple of times. I probably get pedal about 25-50% down myself, but it's pretty quick response otherwise. Try that and see if that works.


Sun Jun 19, 2011 11:39 am
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Post Re: One final (hopefully) Hydroboost question.
I think I've read that sticking brakes & a pedal that doesn't return has to do with the return line plumbing. Using a dual return pump or making sure the h-boost returns straight through the "T" usually fixes it. I have not had this kind of problem, I just think I've read it a few times.

I had a growling/moaning pump when things needed bled. It can take lots of turning lock to lock, don't foam up the fluid. I used a vacuum bleeder & it went very easy.

Chad

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74-AWB 98", ZF5, Atlas4, TGW HP1060 and HP1014 axles, ARBs, 37's, 3.5" lift-5.5" front coil springs, Tahoe rear springs, EFI 302, h-boost, York OBA, 4x4x2, custom dash & gauges
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Mon Jun 20, 2011 12:34 pm
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Post Re: One final (hopefully) Hydroboost question.
You probably will experience a slow pedal return for a couple hundred miles, then everything should be ok. Mine was that way and I believe Rox's was as well, searching on cb.com most of the threads claim slow return for a while

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Wed Jun 22, 2011 3:05 pm
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Post Re: One final (hopefully) Hydroboost question.

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Wed Jun 22, 2011 7:44 pm
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