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One ton hydro boost

K5-Einari said:
This would be good shape for the fitting.

s-l500.jpg
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Yes it would.
But I don't knon of any AN version of this.
 
So for you guys that have dealt with issues when using a Tee in the return, What ill effects were you seeing?

Like, do the brakes start to apply?
Or is the steering harder to turn?

Because no I am wondering what I would gain by going forth and adding a second return nipple to the reservoir.
 
Sterlingfire said:
Should the main line be larger then the hb return in this case then?
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Yes, big time.

Tiha said:
So for you guys that have dealt with issues when using a Tee in the return, What ill effects were you seeing?

Like, do the brakes start to apply?
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Yes

Tiha said:
Because no I am wondering what I would gain by going forth and adding a second return nipple to the reservoir.
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Just put a T before the cooler.
Dumping hot fluid from the HB direct in the resi doesn't help either.
 
my power steering res on the yukon donor that i am gonna use has two returns on the res. thats factory so i was just gonna use that and it has this crazy cylinder on it, if i recall it is filled with nitrogen and will act as an emergency brake if the hydro boost lines fail. or something like that cant recall exactly.

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chaplinfj60 said:
and it has this crazy cylinder on it, if i recall it is filled with nitrogen and will act as an emergency brake if the hydro boost lines fail. or something like that cant recall exactly.
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It's simply a hydraulic accumulator, though that one is way bigger than the ones on the truck and van hydroboosts I've seen.
 
chaplinfj60 said:
is the port people drill out. i am not gonna do it at this time. just like to know is all
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This picture a GM unit?

The superduty units had like a brass insert in one port for some reason. It can be pryed out. Then drill the casting out to the size of the threads.

But the real gains came from the spool machining is my understanding.

I thought this was a good website with a great overview of HB

Hydro-Boost Power Assist Systems: Diagnosis and Repair
 
Bringing this back from the dead.

Installed mid 00's truck Hydroboost on my Scout II. Pedal position stayed the same, just spaced the booster 1" off the firewall.

late 70s style Bendix Dual Rear wheel front brakes, 3/4 T eldorado calipers in rear.

I have currently the 1 1/8" corvette master cyl. pedal seems to go quite far, stopping power is amazing but there is literally no pedal feedback to know how much pressure you're really using.

I have a 1.250" master that I had tried vac boosted and didn't care for it, now that I've got hydro should i go back to the 1.25" (which was the vac boosted size for GM trucks) or should I move to the 1 5/16" (hydro boost 1 ton trucks) or go to the more modern GM 1.450" master?

I just want some more feeling in the pedal.

Thanks for any input.
 
holly crap the other day i found all this info on hydro boost. this may not help you at all. but pretty cool info. again rando but good

but thoughts is since you have crazy pressure from hydro go for 1.25 since you have that.

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Will post a pic or 3 of my aftermarket self built power steering hydroboost setup tonight.

Ive posted it before in the past just dont know where that was.

I used -6 aeroquip stainless teflon lines with stainless lines, yes all aircraft type hoses and fittings sourced from my younger years working at Lockheed and Boeing.

-12 from pump to reservoir.


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PAE said:
Will post a pic or 3 of my aftermarket self built power steering hydroboost setup tonight.

Ive posted it before in the past just dont know where that was.

I used -6 aeroquip stainless teflon lines with stainless lines, yes all aircraft type hoses and fittings sourced from my younger years working at Lockheed and Boeing.
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Mines all self built too, PSC high flow pump, to junkyard sourced booster, to scout II steering box, PSC ram, Cooler, PSC remote dual return res.

That shit all works 100% fine. Its just the pedal effort is way too easy.
 
All of my squares have always been one ton so didnt have to go far to have proper brake systems for those trucks but did upgrade the lines and some valves.
 
PAE said:
All of my squares have always been one ton so didnt have to go far to have proper brake systems for those trucks but did upgrade the lines and some valves.
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So I've never driven a hydro boost setup before so not sure how sensitive it should feel? Vac boost is predictible like manual brakes.
 
Its all ive ever had in any truck so cant say how its different maybe just better performance.

But ya do have to pay more attention to the power steering pump, make extra sure its a good one and not warn out.
 
PAE said:
Its all ive ever had in any truck so cant say how its different maybe just better performance.

But ya do have to pay more attention to the power steering pump, make extra sure its a good one and not warn out.
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Its a high flow PSC like 2 years old not worn out one bit.
 
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I think the only way to tune the pedal feel on hydroboost is to reduce pump output pressure (don't do this) or increase the master cylinder bore.
Hydroboost brakes do not have a lot of pedal feel but are capable of high line pressures.
 
RustyC said:
I think the only way to tune the pedal feel on hydroboost is to reduce pump output pressure (don't do this) or increase the master cylinder bore.
Hydroboost brakes do not have a lot of pedal feel but are capable of high line pressures.
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So since I already have the 1.25 I might as well swap that back and see if it feels any better. If it feels only slightly better I'll buy a 1.325 or 1.450.

Thanks for the input.
 
So since I already have the 1.25 I might as well swap that back and see if it feels any better. If it feels only slightly better I'll buy a 1.325 or 1.450.



Thanks for the input. I street drive mine a lot. So however good the HB brakes are for power the unpredictableness kinda has me sketched. If I can't feel in the pedal where 1/2 way is and I go straight to 75 to 100% that's too much brake.
 
Dont use plastic fittings on hydroboost lines, even the return lines.
 
Making the pedal ratio less would also increase feel / input effort from the driver.
 
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