Hydro boost brake conversion

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Jeff,

i don’t believe my system is getting as warm as yours and I do not have an in-line cooler, it’s gone. I might add one later for piece of mind.....

However, if it’s running that hot, something else is going on. It did take me a while to bleed my system since you gotta gradually get the reservoir to suck all the fluid it. It was prob a 30/45 min process. I’ll check my lines in a bit and confirm if you have them correctly routed but I think you do.

Regards,
 
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Since i have an LS swap, my hydroboost unit is installed the right way round, not upside down like you and Baldilocks. I cannot talk in PS side/DS side so here’s my explanation via the photo :

A = large banjo bolt fitting, runs between the high side of the reservoir to the hydroboost unit
B = medium sized banjo bolt fitting, runs between the hydroboost unit to the high pressure side of the steering box.
C = small banjo bolt fitting, is the return line from the hydroboost unit that runs into the vertical part of the T, not the horizontal cross part.

The cross part is the low pressure side coming from the box going into the low pressure/return side of the reservoir.

Hope that’s clear for you !

Regards,

EA14B970-6CC7-427A-A45C-6B49B3F1E155.jpeg
 
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cme4lyt said:
Since i have an LS swap, my hydroboost unit is installed the right way round, not upside down like you and Baldilocks. I cannot talk in PS side/DS side so here’s my explanation via the photo :

A = large banjo bolt fitting, runs between the high side of the reservoir to the hydroboost unit
B = medium sized banjo bolt fitting, runs between the hydroboost unit to the high pressure side of the steering box.
C = small banjo bolt fitting, is the return line from the hydroboost unit that runs into the vertical part of the T, not the horizontal cross part.

The cross part is the low pressure side coming from the box going into the low pressure/return side of the reservoir.

Hope that’s clear for you !

Regards,

View attachment 2308597
Click to expand...

Ok, so your “B” side is my passenger side, since mine is flipped 180 degrees.

Between your photo reference & @baldilocks description, I should definitely be able to compare to my hose routing.

I’m guessing mine is backwards. I couldn’t imagine any other explanation for my issues.

I will have confirmation of that today. 👍🏻

@cme4lyt it’s interesting you have a banjo fitting for your return lone. Mine is just a nipple & am using hose fittings. It should be fine, as it’s just a low pressure line.

@cme4lyt also interesting you have your T-fitting positioned differently. I am wondering if that would make a difference? At that point both of the lines at the T-fitting are just returning to the reservoir.
 
Yes, C is a banjo fitting on the hydroboost unit; it’s the smallest one and it’s the return line to the T. I’m surprised yours is not a banjo fitting on the hydroboost unit ?

I was told specifically by Matt Sweeting that the return line from the hydroboost unit needs to go into the vertical part of the T not the cross part. The cross is reserved for the return fluid coming from the box/cooler going to the low pressure side on the reservoir.
 
So hose routing is definitely a thing. Correct routing makes it work great. Makes sense.

I swapped the 2 high pressure hoses as recommended by @baldilocks & @cme4lyt.

It runs great now!! 😁

I compared it to my buddies ‘94 rig that just had all flex-break lines replaced by Top Line Performance. You can definitely feel the difference & it stops quicker than his ‘94.

As for the low pressure hose. I kept it the same as @baldilocks described. It seems to work just fine. I’m doubtful routing the T-fitting in either direction would matter.

Bob Sweeting advised me install this way, but @cme4lyt said Matt Sweeting stated different. 🤷‍♂️

I’m just glad it finally works & I’m back on the road!!
 
Great to hear !!!!
 
cme4lyt said:
Since i have an LS swap, my hydroboost unit is installed the right way round, not upside down like you and Baldilocks. I cannot talk in PS side/DS side so here’s my explanation via the photo :

A = large banjo bolt fitting, runs between the high side of the reservoir to the hydroboost unit
B = medium sized banjo bolt fitting, runs between the hydroboost unit to the high pressure side of the steering box.
C = small banjo bolt fitting, is the return line from the hydroboost unit that runs into the vertical part of the T, not the horizontal cross part.

The cross part is the low pressure side coming from the box going into the low pressure/return side of the reservoir.

Hope that’s clear for you !

Regards,

View attachment 2308597
Click to expand...
 
Anyone know if the Marks 4wd hydro boost would work on our FZJ80s. I emailed them and they told the kit was only for the HZJ80 & HDJ80.
 
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MickeyB said:
Anyone know if the Marks 4wd hydro boost would work on our FZJ80s. I emailed them and they told the kit was only for the HZJ80 & HDJ80.
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I suggest calling VanCo in SoCA. I worked with them in 2012 on a different project but got my parts from Matt Sweeting the last time. Having used both, I’d call VanCo myself.
 
Do I talk to Bob or Matt?
 
I’m in need of help!

I’m in Nebraska, drive across county.

The hydro boost unit I have went bad.

I need to replace it, but the shop can’t identify the booster.

Can anyone help?

I’m pretty sure it GM with a corvette master cylinder.

IMG_2421.webp
 
jjdeneen918 said:
I’m in need of help!

I’m in Nebraska, drive across county.

The hydro boost unit I have went bad.

I need to replace it, but the shop can’t identify the booster.

Can anyone help?

I’m pretty sure it GM with a corvette master cylinder.

View attachment 4023562
Click to expand...

The challenge here is that all hydroboost are made by Bosch. Rebranded AC Delco, Mopar, Motorcraft are all Bosch with slightly different specs based on pushrod depth, mounting etc for vehicle application.

So the easy answer is that it’s a Bosch. The not easy answer is which one. What we need and don’t have is what was the “donor” vehicle.

GM should be SAE and Ford should be metric. The gold may also imply GM.
 
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It HAS to be GM, as the MC is from an older Corvette.

I’m hoping Baldilocks or someone knows a little more than me, or recalls the hydroboost model number from powerbraleservice.com.

I’ve called Vanco a few times today, left a message, but no call back as of yet…,
 
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jjdeneen918 said:
It HAS to be GM, as the MC is from an older Corvette.

I’m hoping Baldilocks or someone knows a little more than me, or recalls the hydroboost model number from powerbraleservice.com.

I’ve called Vancouver a few times today, left a message, but no call back as of yet…,
Click to expand...

I’m inclined to agree but only caution at master cylinders can be interchangeable across brake boosters.
 
Not sure.

I’m at a random shop in Nebraska on my way to Pennsylvania.

Sweeting & Vanco are both not answering their phones or returning calls for the entire day now.
 
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