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Super duty Hydro boost

Idaho Ben

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Sep 15, 2015
Messages
6
I have been reading a lot of articles about doing a super duty hydroboost. Most of them say they’re using the Dodge master cylinder. I haven’t read one article that says what happens if you use the super duty master cylinder. Is anybody trading on here?
 

EPB72

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Jul 13, 2019
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Pleasant Hill, CA
Ben for the most part the master cyl. will need hood clearance with the super duty MC I think is to tall and you would have to be willing to have it stick through a hole in the hood..
 
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Idaho Ben

Idaho Ben

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Joined
Sep 15, 2015
Messages
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Ben for the most part the master cyl. will need hood clearance with the super duty MC I think is to tall and you would have to be willing to have it stick through a hole in the hood..
Thank you.
 

OsideDave

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Nov 18, 2006
Messages
875
I did the superduty with Dodge Diplomat master cylinder. It's been sometime from my research on this but believe one of the main reasons for the Dodge mc as it isn't too touchy when applying the brakes.
 
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Idaho Ben

Idaho Ben

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Sep 15, 2015
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I did the superduty with Dodge Diplomat master cylinder. It's been sometime from my research on this but believe one of the main reasons for the Dodge mc as it isn't too touchy when applying the brakes.
Ok. Thanks. Do you remember what you used for a spacer? All the ones I see look like they’re cut from a milling machine
 

OsideDave

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Nov 18, 2006
Messages
875
Ok. Thanks. Do you remember what you used for a spacer? All the ones I see look like they’re cut from a milling machine
Hello Idaho Ben sorry for the delay. I was able to make one out of some aluminum. I did buy one that I didn't use and could ship it to you if I can find it
 

Cortez

Bronco Guru
Joined
Jan 29, 2009
Messages
1,174
I did the hydroboost and MC from a 98 cobra mustang darn near plug and play…just a slight mod to rotate the bracket. And it fit under the hood with my 351. I do have a 1” body lift though, but I imagine it would fit without a BL.
 

Speedrdr

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Mississippi
I did the hydroboost and MC from a 98 cobra mustang darn near plug and play…just a slight mod to rotate the bracket. And it fit under the hood with my 351. I do have a 1” body lift though, but I imagine it would fit without a BL.
How hard was it to get the lines/tubing bent to hook up to the MC? I’m assuming you were able to use your existing brake ones.

Randy
 

Broncobowsher

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Jun 4, 2002
Messages
33,357
I recall the super duty master is a massive bore. Not the typical 1". But 1¼" on the small side up to 1½" bore. Badly mismatched for Bronco sized brake system.
 

Yeller

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Mar 27, 2012
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Rogers County Oklahoma
I'm running a 1-3/8" bore on bronco sized brakes with Hydroboost, I like the feel and it stops very well, just has very little travel.
 

toddz69

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I'm running a 1-3/8" bore on bronco sized brakes with Hydroboost, I like the feel and it stops very well, just has very little travel.
What master cylinder are you running? The Super Duty one?

Todd Z.
 

Yeller

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What master cylinder are you running? The Super Duty one?

Todd Z.
It’s off a 2003 Chevy 1500 4x4. It’s not on my bronco, but my Gladiator, which has a typical Ford/GM disc swap and rear 11” ford drums. The reservoir is too tall for a bronco but is plastic so I’m assuming astro van reservoirs would fit on it. The superduty one is 1-1/2”, so is 1 ton GM of the same vintage.

I tried it to see how I liked it, knowing what I know now I would have just used the 1-1/2” bore that I threw in the trash…. I was convinced the feel would be poor along with a high apply force, hydro boost solves all of that. Tried the 1-3/8, was on a truck a buddy was parting out, it’s still on there.
 

toddz69

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It’s off a 2003 Chevy 1500 4x4. It’s not on my bronco, but my Gladiator, which has a typical Ford/GM disc swap and rear 11” ford drums. The reservoir is too tall for a bronco but is plastic so I’m assuming astro van reservoirs would fit on it. The superduty one is 1-1/2”, so is 1 ton GM of the same vintage.

I tried it to see how I liked it, knowing what I know now I would have just used the 1-1/2” bore that I threw in the trash…. I was convinced the feel would be poor along with a high apply force, hydro boost solves all of that. Tried the 1-3/8, was on a truck a buddy was parting out, it’s still on there.
Cool - thanks - more noodling to do. I think the SD master cylinders went to the 1.5" bore sometime after they went to the coil springs and bigger front brakes in later years. The leaf sprung trucks were still 1 3/8" bore.

Todd Z.
 
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Yeller

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Cool - thanks - more noodling to do. I think the SD master cylinders went to the 1.5" bore sometime after they went to the solid axles and bigger front brakes in later years. The leaf sprung trucks were still 1 3/8" bore.

Todd Z.
Guess I should clarify, no idea the year of the SD masters I’ve looked at other than the ones on my 16 and now 19. I did find it interesting that it stopped as well as it does.
 
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Idaho Ben

Idaho Ben

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Sep 15, 2015
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Hello Idaho Ben sorry for the delay. I was able to make one out of some aluminum. I did buy one that I didn't use and could ship it to you if I can find it
Heck yeah, If you find it I'd be glad to buy it from you.
 

nvrstuk

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Just a Bronco driver for over 50 yrs!
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Jul 31, 2001
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6,508
Body lift won't help... 1" or 6" is the same... :)

I also use a GM mc for my HB setup. I have large 3.15" calipers so it takes a bit of fluid to fill. The 1.33" bore MC does a great job. Just wish it was plastic.
 

DirtDonk

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Why the desire for plastic? Lighter weight? Better sealng lid? More options? Newer looking?
Curious minds want to know! :)

I actually like them too, but I am avoiding them and staying with some type of metal just to avoid a catastrophe where there might otherwise be none.
In a situation where you might have a short flash fire under the hood from the engine, it might be enough to melt a plastic master cylinder and leave you stranded.
Where an iron or aluminum one might last a little bit longer while you put the fire out.
Kind of out there in left field, but I’ve seen enough fires under the hood over the years to always have it in the back of my mind.
 

DEEPWOODS

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I have the 1.5 super duty master cylinder I changed the reservoir tank to astro van tanks . I needed 1.5 Bore for f250 calipers front and the big Chevy calipers on the rear the 1.5 works great for my setup . I think it dep on what size calipers you have . I could not get the dodge MC to work with the big calipers
 

nvrstuk

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Just a Bronco driver for over 50 yrs!
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Jul 31, 2001
Messages
6,508
Why the desire for plastic? Lighter weight? Better sealng lid? More options? Newer looking?
Curious minds want to know! :)

I actually like them too, but I am avoiding them and staying with some type of metal just to avoid a catastrophe where there might otherwise be none.
In a situation where you might have a short flash fire under the hood from the engine, it might be enough to melt a plastic master cylinder and leave you stranded.
Where an iron or aluminum one might last a little bit longer while you put the fire out.
Kind of out there in left field, but I’ve seen enough fires under the hood over the years to always have it in the back of my mind.
Still in the mtns of Idaho...be surprised if this posts...

Plastic body & cap.

No rust, less weight, NEVER leaks-ever!

More later. I'll check this weekend when I have decent reception.

I think if you have a fire that is hot enough to melt a mc would be hit enough to melt EFI sensors and injectors.
I think you're overthinking the potential fire damage Paul. :)

I remember when we were all saying the same about efi & carb! Pwr brakes & manual, pwr strg & manual, manuals & autos! lol

Just flipping a little &@(÷× out there!!! lol
 
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toddz69

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Plastic body & cap.

No rust, less weight, NEVER leaks-ever!

I think if you have a fire that is hot enough to melt a mc would be hit enough to melt EFI sensors and injectors.
I think you're overthinking the potential fire damage Paul. :)

I remember when we were all saying the same about efi & carb! Pwr brakes & manual, pwr strg & manual, manuals & autos! :)

Just flipping a little &@(÷× out there!!! lol
I have some leaks/seepage from mine from time to time but it's an easy cleanup and doesn't leave stains like the metal master cylinders.

If we have a underhood fire that melts a master cylinder, we've got a lot bigger problems to deal with!

Todd Z.
 
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