Difference between hydro and vacuum brake pedal assembly?

shotty

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Bumping this instead of starting a new thread... NV4500 swap into an m1008, you need an 85 and up hydroboost clutch setup, right? Anything earlier is manual clutch. Just want to confirm, ebay sellers list things as 75-87 hydroboost which isn't helping.
 

Black Ops

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Bumping this instead of starting a new thread... NV4500 swap into an m1008, you need an 85 and up hydroboost clutch setup, right? Anything earlier is manual clutch. Just want to confirm, ebay sellers list things as 75-87 hydroboost which isn't helping.
85 and up had hydraulic clutch. Any year could have hydroboost brakes.
 

shotty

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85 and up had hydraulic clutch. Any year could have hydroboost brakes.
Yes, of course you still need to find a hydroboost specific setup, I should have clarified. I was concerned about model years since a lot of sellers dont state hydraulic or manual clutch but are usually pretty good about stating if its hydroboost or vacuum assist brakes.
 

erasedhammer

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Yes, of course you still need to find a hydroboost specific setup, I should have clarified. I was concerned about model years since a lot of sellers dont state hydraulic or manual clutch but are usually pretty good about stating if its hydroboost or vacuum assist brakes.
I heard that the pedal differences between vacuum and hydroboost are minimal. apparently the rod is just a different length.
 

Black Ops

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I heard that the pedal differences between vacuum and hydroboost are minimal. apparently the rod is just a different length.
The pin the brake rod attaches to is in a different spot so the easiest thing to do is just put the hydroboost brake pedal onto the manual transmission pedal assembly and cut the foot pad down like posted earlier in the thread, but you could modify a vacuum pedal as well.
 

Black Ops

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Yes, of course you still need to find a hydroboost specific setup, I should have clarified. I was concerned about model years since a lot of sellers dont state hydraulic or manual clutch but are usually pretty good about stating if its hydroboost or vacuum assist brakes.
I would make sure even if someone says it’s out of an 85 or newer that it really is a hydraulic clutch setup as it’s not uncommon for things to be swapped around. I just bought a 79 that had been swapped to hydraulic clutch.
 

shotty

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The pin the brake rod attaches to is in a different spot so the easiest thing to do is just put the hydroboost brake pedal onto the manual transmission pedal assembly and cut the foot pad down like posted earlier in the thread, but you could modify a vacuum pedal as well.
Good to know that's an option as well. A lot easier to find the vacuum pedal assemblies.
 

ALTOcal

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I have a few solutions to this problem...finding a hydraulic and hydro boost pedal assembly may be expensive or time consuming (or both). You can find genuine parts from 4speedconversions as well as a lot of part numbers and which vehicle they came from.


you can also get all mechanical linkage in a kit (or individually) from USA1



I’m working with mechanical pedals that are non-hydro boost. They still need to be modified on the brakes side, but Modern Drive Lines makes a hydraulic retrofit kit to work with the mechanical pedals. This is no joke, they engineered this, not something you’ll have to modify to work in a stock setup. Call them, they will modify the kit to match your slave cylinder bore x travel and the right house fittings

 

erasedhammer

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I have a few solutions to this problem...finding a hydraulic and hydro boost pedal assembly may be expensive or time consuming (or both). You can find genuine parts from 4speedconversions as well as a lot of part numbers and which vehicle they came from.


you can also get all mechanical linkage in a kit (or individually) from USA1



I’m working with mechanical pedals that are non-hydro boost. They still need to be modified on the brakes side, but Modern Drive Lines makes a hydraulic retrofit kit to work with the mechanical pedals. This is no joke, they engineered this, not something you’ll have to modify to work in a stock setup. Call them, they will modify the kit to match your slave cylinder bore x travel and the right house fittings


I got mine installed. No fabrication at all. I bought Vacuum brake/Hydraulic Clutch pedal assembly and just put the auto brake pedal into the assembly. Works great.
 
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