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cgraham1

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You probably have eldarado/79-80 z28 rear calipers if it’s got built in parking brakes and gm based. I am a fan of manual breaks if you can get the correct set up! You could probably come close to retaining the Jeep master cylinder if you used the wilwood d52 twin piston calibers. 1/2 ton gm front calipers are usually happy with an 1-1/16 master with a vacuum booster, the “Corvette” master cylinder is a style that is usually used for disk/disk applications, they came in many different sizes. The other consideration is a Proportioning valve, some have a residual valve used on drum breaks to hold about 6psi line pressure. You will want an aftermarket proportioning valve like one from summit that has a dial to reduce rear brake so you can tune front/rear Bias. My 68 camaro is using 2005 corvette rotors and calipers front and back, it is perfectly balanced without a propositioning valve(even though I have a tunable one) and a 7/8 willwood master cylinder, this is manual, not power
Now you’ve given me a lot to think about! I’ve seen those Wilwood calipers... they are pricey! I’ll check my master cylinder/booster to see what I ended up with.

Thanks for all that info!
 

cgraham1

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Thats a ford 8.8 from an explorer?

It’s a custom built ProRock high pinion Dana 60 rear end from Dynatrac. It’s got 35 spline axles, an ARB air locker and 4.56 gears... and it’s got more clearance under it than a Dana 44 or AMC 20.

217573EB-6E07-4A32-8F4B-C87D9633195A.jpeg

I will call them for specs on the brakes.
 

Bigmac

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I’ve had this booster/MC sitting in my shed for 4 or 5 years... I just now opened the box.

Looks like it’s got a 1” bore diameter and the booster is 7” diameter.

View attachment 156533 View attachment 156534
The 1” bore should match well with your system, a lot of people think a larger master cylinder would give you more pressure, but it doesn’t it gives more volume and less pressure!
It should give you good pressure and some petal modulation. If you system is bleed properly and you petal is rock hard and almost doesn’t move when you push it, and your vehicle doesn’t want to stop, your master cylinder is too big, going down a 1/16-1/8 will make your petal move farther and increase break pressure, and the opposite it true it your system is all in proper working order and it’s bleed properly...but you foot almost hits the floor or you master cylinder is bottoming out the vehicle should stop well but have too much petal modulation then you need a larger master cylinder, the problem becomes you lose pressure doing so, and also need to upgrade to a larger or more powerful booster as well
 

Bigmac

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The other thing you will want to check is if you master cylinder has a front/rear bais, it looks like yours is neutral, if you look at your factory jeep one, one reservoir will be larger than the other, the large one is for the front brakes, it only makes a difference if they have a limited flow, I had a friend with a Jeep and he had hooked up the brake proportioning valve backwards ( he had installed a Chevy master cylinder With different sized front rear reservoirs) and the system is not designed to give as much volume to the rear calipers so we had a very short throw to fill the front calipers, Once reversed the brakes worked great
 

Steve

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The 1” bore should match well with your system, a lot of people think a larger master cylinder would give you more pressure, but it doesn’t it gives more volume and less pressure!
It should give you good pressure and some petal modulation. If you system is bleed properly and you petal is rock hard and almost doesn’t move when you push it, and your vehicle doesn’t want to stop, your master cylinder is too big, going down a 1/16-1/8 will make your petal move farther and increase break pressure, and the opposite it true it your system is all in proper working order and it’s bleed properly...but you foot almost hits the floor or you master cylinder is bottoming out the vehicle should stop well but have too much petal modulation then you need a larger master cylinder, the problem becomes you lose pressure doing so, and also need to upgrade to a larger or more powerful booster as well


You explained that very well!
 

Marshy

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Foud a guy on Facebook giving away 60-70 sonotubes for free! They are 14" by 12'. So I rented a trailer and got down there quick. Loaded 17 and headed back. Im making another trip the morning, possibly two if he let's me. I have plans to build a horse barn this coming year so they will be pr to good use. To give you an idea, Lowe's sells 12" by 4' for about $11. So they are worth about $35 each tube.
20181228_160144.jpg
 

stihl_head1982

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Foud a guy on Facebook giving away 60-70 sonotubes for free! They are 14" by 12'. So I rented a trailer and got down there quick. Loaded 17 and headed back. Im making another trip the morning, possibly two if he let's me. I have plans to build a horse barn this coming year so they will be pr to good use. To give you an idea, Lowe's sells 12" by 4' for about $11. So they are worth about $35 each tube.
View attachment 156848

I've seen these used often in pole barn construction. Looks like you hit the motherload. Congrats
 

Dub11

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Foud a guy on Facebook giving away 60-70 sonotubes for free! They are 14" by 12'. So I rented a trailer and got down there quick. Loaded 17 and headed back. Im making another trip the morning, possibly two if he let's me. I have plans to build a horse barn this coming year so they will be pr to good use. To give you an idea, Lowe's sells 12" by 4' for about $11. So they are worth about $35 each tube.
View attachment 156848

Stack higher!
 

beaglebriar

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Foud a guy on Facebook giving away 60-70 sonotubes for free! They are 14" by 12'. So I rented a trailer and got down there quick. Loaded 17 and headed back. Im making another trip the morning, possibly two if he let's me. I have plans to build a horse barn this coming year so they will be pr to good use. To give you an idea, Lowe's sells 12" by 4' for about $11. So they are worth about $35 each tube.
View attachment 156848
Don't do it.. horses are stupid.
adac03a495095934f9451238e03514e3.jpg
 
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