horrible brakes [Archive]

SMOA

03-01-2002, 07:23 PM

i just swapped dana44 front end and a 60 rear end in my 78 cj-5
they have 3/4 ton brakes and i cant get any pressure. i replaced my master cylinder and power brake booster with one's out of a 80 3/4 ton chevy 4x4. i have pressure but it wont hold. anybody have any ideas as to what else i could try??

thankyou
oh and I spent an hour looking through old post an found nothing that could help:beer:

CU4WHLN

03-01-2002, 08:27 PM

Upgrade ...
Remove all the original CJ brake stuff.... master, booster, any linkage.

I took the setup from a wrecked ZJ. Pulled the master and booster. (It's the usual dual diaphram booster). Look and see which port is front and rear - MARK IT!

It's a tight fit, but can be mounted in a CJ. You have to use that spacer between the firewall and dash. Make sure you get it. You might have to "clearance" the hood reinforcement for the resevoir. (we did 2 CJs .... one was ok, the other needed a bit of hammer power)

Center up the new unit as LOW as you can in the existing opening and drill 4 new holes to mount. ( Remember, keep as LOW as possible) Have to open up the center hole to clear the new booster. ( You'll see when ya get to this point.)

The rod fits right on a CJ brake pedal ( at least on my 85, I assume all CJs ?)

Bolt it up tight. don't push the pedal yet! might damage something in the booster/master.

I removed the stock prop valve. Used a T fitting to marry up the original front lines and ran them DIRECT to the master cylinder.

I plumbed the rears with an adjustable prop valve for street tuning. ( A dedicated trail rig might be able to skip this ?? )

Set up of prop valve: Get on some smooth blacktop.... lock em up from about 25 mph. Have a bud watch your tires. Back off the rear brakes until the front brakes lock up first, or at the same time. Very important! If the rear locks up first, this can cause a spin. (Trail rigs are exempt from this step )

NOTE: The ZJ master uses metric fittings... I found metric to standard adaptors at NAPA. But it was a PITA to get the right ones.

I am running 33's with 4 wheel discs. I can lock them at any speed. Almost too much boost.

NOW HAVE FUN,, just do it.

:usa:


Pirate4x4.Com > Brand Specific Tech > Jeep - Hardcore Tech > horrible brakes PDA : horrible brakes SMOA 03-01-2002, 07:23 PM i just swapped dana44 front end and a 60 rear end in my 78 cj-5 they have 3/4 ton brakes and i cant get any pressure. i replaced my master cylinder and power brake booster with one's out of a 80 3/4 ton chevy 4x4. i have pressure but it wont hold. anybody have any ideas as to what else i could try?? thankyou oh and I spent an hour looking through old post an found nothing that could help:beer: YJ4LIFE 03-01-2002, 07:56 PM a proportioning valve? www.summitracing.com CU4WHLN 03-01-2002, 08:27 PM Upgrade ... Remove all the original CJ brake stuff.... master, booster, any linkage. I took the setup from a wrecked ZJ. Pulled the master and booster. (It's the usual dual diaphram booster). Look and see which port is front and rear - MARK IT! It's a tight fit, but can be mounted in a CJ. You have to use that spacer between the firewall and dash. Make sure you get it. You might have to "clearance" the hood reinforcement for the resevoir. (we did 2 CJs .... one was ok, the other needed a bit of hammer power) Center up the new unit as LOW as you can in the existing opening and drill 4 new holes to mount. ( Remember, keep as LOW as possible) Have to open up the center hole to clear the new booster. ( You'll see when ya get to this point.) The rod fits right on a CJ brake pedal ( at least on my 85, I assume all CJs ?) Bolt it up tight. don't push the pedal yet! might damage something in the booster/master. I removed the stock prop valve. Used a T fitting to marry up the original front lines and ran them DIRECT to the master cylinder. I plumbed the rears with an adjustable prop valve for street tuning. ( A dedicated trail rig might be able to skip this ?? ) Set up of prop valve: Get on some smooth blacktop.... lock em up from about 25 mph. Have a bud watch your tires. Back off the rear brakes until the front brakes lock up first, or at the same time. Very important! If the rear locks up first, this can cause a spin. (Trail rigs are exempt from this step ) NOTE: The ZJ master uses metric fittings... I found metric to standard adaptors at NAPA. But it was a PITA to get the right ones. I am running 33's with 4 wheel discs. I can lock them at any speed. Almost too much boost. NOW HAVE FUN,, just do it. :usa: