14b swap + 40" Boggers = No Brakes?

[87BrnRsd]

I have a '79 Blazer, and just swapped out my 12b for a 14bFF in the rear. I also installed a set of 18/39.5x15 Boggers on the rear only. Now I can't stop hardly at all. I bled the brakes quite thoroughly (ran about 1/2 quart through) and still it seems to take forever to stop. I was expecting some slow stops, but this seems worse. Is this just what I should expect (and what will get worse when I put on the 3/4t 10-bolt front axle) or is something wrong?

Something is definitely wrong. Did you reset the proportioning valve? That could be a simple solution. Also, it shouldnt increase your stopping distance switching to a 14ff, it should decrease it. The drums on the 14ff dwarf those on your old 12 bolt, So with bigger drums, how would it be possible to have a longer stopping distance if everything is working properly? Also, it shouldnt get worse if you put a 3/4 ton 10-bolt front in. Its the same situation. The 3/4ton 10 bolt has a slightly larger rotor than the 1/2 ton 10-bolt, which should mean more braking surface, which means, less stopping distance.
-Harrison

 

[K5Kell]

Did you reset the proportioning valve?
-Harrison

Whats the process behind reseting it?
-Kell-

 

[85HeartBurb]

So if 39 boggers are in the rear what is up front???

 

[guido666]

35 Dunlop Discoverers up front until next week when the 3/4t axle goes on.

I knew the 14bFF itself wouldn't increase stopping distance, but I thought all that rolling rubber would. Those tires weigh 117lb with no rim!! What I wasn't sure of was which would make the greater difference, the decrease in stopping distance because of the big drums, or the increase due to the big tires. Any thoughts?

After adjusting the drum (the other one is stuck) it stops better, noticeably. How do I go about removing the drum/hub combination to get in there to replace/repair the adjuster?

 

[dremu]

35 Dunlop Discoverers up front until next week when the 3/4t axle goes on.

I knew the 14bFF itself wouldn't increase stopping distance, but I thought all that rolling rubber would. Those tires weigh 117lb with no rim!! What I wasn't sure of was which would make the greater difference, the decrease in stopping distance because of the big drums, or the increase due to the big tires. Any thoughts?

After adjusting the drum (the other one is stuck) it stops better, noticeably. How do I go about removing the drum/hub combination to get in there to replace/repair the adjuster?

You need the magic socket to remove the big nuts holding them on -- it's much like the socket that holds the front hubs on, if you've ever taken those off.

First up is remove the shafts, then inside you use the magic socket, then pull the washer, then the other magic nut, the fricken heavy drum and hub and bearing all come off =))

The magic socket is a six pin, I think, and can be had from OTC as well as Snap-On or what have you. Your local parts place may have it as well. Search for '14 bolt socket' and I'm sure you'll find detail.

The adjusters can often be repaired, depending on rust level, with prodigious amounts of swearing and WD40, or maybe a little emery cloth and some grease.

-- A