Scout 80 brake booster?

[oneton72gmc]

I'm building my new project Scout, with the usual crap, and of the many things I am contemplating at this point are the brakes.

I was curious what has been done to improve the braking system on these things, what kind of brake boosters/master cylinders have some of you used, and what kind of work was needed to fit it all. I don't think the stock master cylinder will stop Dana 60's F/R with disc brakes all too well.

[scout254]

posted this in the past, but oh well.

'88 3/4T Suburban 2x power booster and master cylinder. Stops just fine with D60 front, GM 14 bolt rear 13"drum. (one of these days disc rear):flipoff2:

http://i26.photobucket.com/albums/c101/scout254/PB010034.jpg

http://i26.photobucket.com/albums/c101/scout254/PB010028.jpg

Used stock pedal assmbly and firewall mount, just made adapter plate to fit the booster to the scout80.

:cool2:

[Urban Wheeler]

Hydroboost.

http://i7.photobucket.com/albums/y257/Fryloc/hydro3small.jpg

Had to mount a ps pump, but that just got me a source for power steering.


Look for more info in the buildup threads part of the FAQ.

[Ben W]

I don't like power brakes for a trail rig unless it is fuel injected. 80's have a nice long pedal that works well with manual brakes unless you are a limp leg bitch. Do aftermarket twin single MC's or a find a tandem that matches up to your brakes. Adapting the mount should be a breeze.

If you have the stock single circuit MC, you'd be suprised how well it works with disc brakes. Its not the best option though because you have NO redundancy if you lose a line.

[Brandon]

http://whiteknucklemotorsports.net/gallery/albums/BAsteering/68vetteMC2.jpg

68 vette MC worked well on my jeep

[MochaMike]

72 Ford Mustang MC...

They had discs x4 & the MC has a Large & Small resv.

[Hammered Scout]

Sorry to highjack Oneton72gmc but since we're on the subject of Brake Masters. I'm gonna be running a Cummins 4Bt and these Diesels supposedly build no to little vacuum what kinda system or parts should run? By the way I was running 77 Scout II powerbooster and master cylinder. Thanks

[oneton72gmc]

I don't like power brakes for a trail rig unless it is fuel injected. 80's have a nice long pedal that works well with manual brakes unless you are a limp leg bitch. Do aftermarket twin single MC's or a find a tandem that matches up to your brakes. Adapting the mount should be a breeze.

If you have the stock single circuit MC, you'd be suprised how well it works with disc brakes. Its not the best option though because you have NO redundancy if you lose a line.


Why unless fuel injected? Even carburated, your engine should run most of the time your wheelin' right? Then it would help stop it too, unless I am missing somthing?

I guess i'm mostly concerned about the stock MC not being able to fill up the Dana 60 and 10 bolt calipers with enough fluid to stop me.

scout254- that is just what I was looking for. That just clears the inner fender don't it? I didn't think it would fit, but you just proved me wrong. Thanks.

[Mechanos]

Why unless fuel injected? Even carburated, your engine should run most of the time your wheelin' right? Then it would help stop it too, unless I am missing somthing?...
Because when it does die (and with a carb, it will) you will most likely be on an extreme incline/decline and will have reduced braking ability. At least with FI, you don't have to worry about it dieing due to extreme angles.

[Harvester of Sorrow]

Because when it does die (and with a carb, it will) you will most likely be on an extreme incline/decline and will have reduced braking ability. At least with FI, you don't have to worry about it dieing due to extreme angles.

That is why I will FI first....

Then look at changing over the style of brakes....

Until then though my '61 Scout 80 will stay manual brakes...As BEN W mentioned it does an ok job of stopping the rig with Dana 60 discs in the rear...and 3/4 8 lug discs on the Dana 44 in the front.

The rear has a proportioning valve to keep them in check from locking first...

[Diesel Smoke]

Because when it does die (and with a carb, it will) you will most likely be on an extreme incline/decline and will have reduced braking ability. At least with FI, you don't have to worry about it dieing due to extreme angles.

Seen it happen, and it wasn't cool! Both people walked away, but the Scout was destroyed, as well as one tree. Ask Binderbound about it :flipoff2: !

[scout254]

scout254- that is just what I was looking for. That just clears the inner fender don't it? I didn't think it would fit, but you just proved me wrong. Thanks.

Nope.... I did have to trim the fender:grinpimp: and then made a bottom inspection cover to cover the hole from underneath so no mud will come through.

[oneton72gmc]

So far it seems as though it should stop fine without power, and maybe just a corvette master cylinder? I just didn't think that with manual brakes I could provide enough fluid to fill the calipers to compress them, I guess I was wrong. Then agian, this is my first wheeler without power brakes.

Thanks for the tips guy's scout254 you had me fooled, looks good. Looking at mine, I was still trying to figure out how it would clear until you said that.

[binderbound]

I will never wheel a rig with power brakes again! After destroying my baby and seeing all the hairy situations boosters with no vacum cause, I'll stick to manual. I have 4 wheel disc's on my 63 with the Mustang M/C and it stops great.

[R290]

Ok before I open my mouth and put my foot in it there. I ping Van at VancoPBS about HB brakes and no engine power. here what he said.

Hydroboost is a ton easier then vacuum brakes to operate if you use the charges up on both. A Hydroboost is a steel shaft straight to the master, it's actually a hair easier then manual brakes, where as a vacuum booster is an absolute bear to use when the vacuum is gone.

I had a few customers try it out who had manual to start with. One guy even drove it around the city without his hydraulic hoses hooked up (I forgot to send him fittings..oops). They all reported it as an upgrade to their manual brakes. Then of course with it working...happy bunch of guys.

I too have had to back down a hill with vacuum brakes and no engine power:barf: I was standing on the brake with both feet and pulling on the steering wheel and still down down hill.
So I will be going HB too.:D

[Brandon]

Van has my brake bracket and I was planning on having him set me up on my 80 but I am not positive yet, money is a definate concern :(

[Mechanos]

If you're going to run hydro-assist also... have Van high-flow the HB while you're at it.

[R290]

If you're going to run hydro-assist also... have Van high-flow the HB while you're at it.

So I take it's more than Home shop can do?

[Mechanos]

So I take it's more than Home shop can do?
Yeah.... unless you can:
a) figure out how (what to modify) to do it yourself.
b) have a lathe and a mill to do the modifying.
c) can find a source for the rebuild parts.

[ChiScouter]

Tricking out hydroboosts must be about one of the last mods that the general public doesn't have the info availible to diy.

[Mechanos]

It wouldn't be hard to find what to do.... you only need to shell out the money to have it done, then take it apart and compare it to an unmodified one. Of course, for the DIYer, it's anti-productive since your still out the money to have it done in the first place. Even if you did all that, there is still the problem of sourcing a rebuild kit. As I understand it, the rebuild kits are not currently available to the public. I'd like to know what's done as much as the next curious guy, but I'm not about to take mine apart to find out.

[oneton72gmc]

OK Urban Wheeler where did you get your hydroboost unit from? I know they came in some years of cadilacs I think, and 1 ton GM vehicles in the 80's, but did you get some kind of kit or somthing? Or just pirate one from somthing else? Just curious. I don't think my local junyards have too many rigs that came with hydro boost, although I don't know what all the vehicles were that came with it either.

[Chief yelling alot]

OK Urban Wheeler where did you get your hydroboost unit from? I know they came in some years of cadilacs I think, and 1 ton GM vehicles in the 80's, but did you get some kind of kit or somthing? Or just pirate one from somthing else? Just curious. I don't think my local junyards have too many rigs that came with hydro boost, although I don't know what all the vehicles were that came with it either.



ther in alot of gm vehickels, the easest is out of an later astro van ther alys seems to be tons of them in the pnp

[Chief yelling alot]

Ok before I open my mouth and put my foot in it there. I ping Van at VancoPBS about HB brakes and no engine power. here what he said.

Hydroboost is a ton easier then vacuum brakes to operate if you use the charges up on both. A Hydroboost is a steel shaft straight to the master, it's actually a hair easier then manual brakes, where as a vacuum booster is an absolute bear to use when the vacuum is gone.

I had a few customers try it out who had manual to start with. One guy even drove it around the city without his hydraulic hoses hooked up (I forgot to send him fittings..oops). They all reported it as an upgrade to their manual brakes. Then of course with it working...happy bunch of guys.

I too have had to back down a hill with vacuum brakes and no engine power:barf: I was standing on the brake with both feet and pulling on the steering wheel and still down down hill.
So I will be going HB too.:D


i dont know about that my bros 85 burb w6.2 is a bare to stop if the engine isn't running :eek:

[R290]

i dont know about that my bros 85 burb w6.2 is a bare to stop if the engine isn't running :eek:

Once I get HB installed, I will know real quick:( I'm running out of time and need to get my junk on the trail, so I decided to buy one of Vanco HB units.

oneton72GMC did you read the FAQ :rolleyes: I have an 85 burb HB unit I got at the J.Y. if you want it $25, thats what I paid.

[Urban Wheeler]

OK Urban Wheeler where did you get your hydroboost unit from? I know they came in some years of cadilacs I think, and 1 ton GM vehicles in the 80's, but did you get some kind of kit or somthing? Or just pirate one from somthing else? Just curious. I don't think my local junyards have too many rigs that came with hydro boost, although I don't know what all the vehicles were that came with it either.
It came out of a 90 something Astro. I took some flack for having the little resevoirs on there, but right now that is at the bottom of the list. I used a ps pump from an s-10 because I already had it, then had to have some hoses modified to fit. The GM parts are metric and o-ringed fittings, while the IH box has cone fittings. I went to a hydraulic shop with a handfull of hoses and had them cut some ends off and braze them to other hoses. You can get little adapters to go from cone to o-ring, look in the FAQ. There is a hydroboost writeup and a link to the adapters.