caliper mount

Tonight I installed the pertronix flame thrower coil, electronic ignitor, and got the knuckles apart. Word to the wise for you all doing the disc brake conversion, or where I from Y'all, while you have everything apart go ahead and check your knuckle bearings. I discovered my king pin bearings were shot and my ball joints needed to be replaced. Just empty every pocket isn't that what they say. :easy rider:

 

Yeah I shelled out an extra $115 when I went back to exchange the rotors for Wagners and the pads for organic type.

 

Yeah, those 1.125 inch thick rotors aint cheap. I just hope they last forever on a lightweight Jeep ...

 

Wow, $130 for king pin bearings, cups, and seals. This is getting ugly.

 

Funny how one thing leads to another. I started out by replacing a seized wheel bearing on my 27. Ended up rebuilding the whole front end, added discs and installed a Power Lok.

 

ok, i jsut did a dry fit, i have not yet had my hubs machined. and i do have a slight clearance issue, rotor is scrubbing the caliper mount, and the inner brake pad will not fit. it appears after the hub is machined all will be good. I am gonna dig up those race #'s nickmil posted in case i wind up needing them.


question? will those races fit the D27 hub. if not it is no big deal. I have a spare set of the D25 hubs. I just need to know before I go and have these hubs machined, no point having 4 hubs machined

LM501311 & national seal # 8430s.... are these for the d25? hub

 

Check this thread: http://www.earlycj5.com/forums/showthread.php?t=72005

Let me know if you want to measure something. I don't think the '11 races will fit the D25 hubs?

 

ok now I am confused, I have both the early, and a set of the later style hubs, which #'s fit what? just a clarification is all i need. It really makes no difference which hubs i use, i just need to know what races that will offset the hub and what hub i need to use to do so. too many part #'s floating around in my head now

 

LM501311 & national seal # 8430s.... are these for the d25 hub? and these

LM501349 for the D27 hub, or have i got it bassakwards

 

The 501311 is the conversion race to space the rotor outward for proper centering of the rotor and caliper. Used to replace the 501310 used in the D27 hub. The LM 501349 is the stock bearing # used with the D27. It's the wider bearing you need for the conversion. The 8430s is the seal you need to use with the conversion race. DO NOT drive it in all the way as it will hit the bearing as the conversion race spaces the hub out further. Only drive it in far enough to hold securely but still have clearance between the seal lip and inner bearing.

 

thanks nickmil for the clairification

 

Now I am a little confused. Do the bearings and races in the D27 have to be replaced for the conversion to work, or is this just if you have clearance problems? I have not gotten this far yet, but I planned on using the bearings and races that were in the hubs because they were in great shape. In all of the conversion articles i have read, none of them mentioned anything about changing out the bearing or race application.

 

I first tried to use the original bearing, race and seal. I had clearance issues and ended up using the bearing and race mentioned. Once I used them everything lined up perfectly.

 

Oh and by the way don't make the same mistake that I made by not double checking your part numbers. I ordered the 4045 and 4046 calipers. I checked my receipt when I got home and it matched so I got started mocking the caliper up and grinding the knuckle. I did just as instructed, grind a little and then test fit. It looked like an awful lot of material to take off, but I have read several post where others thought the same so I continued grinding. It got to the point where there was not much material left for the back side bolts to thread in to. So the next step was to take a little material off of the caliper. When that still did not work I went to the pictures posted of the the calipers used for the conversion. The calipers I had looked the same but had huge lip on them where the brake line bolted in. I looked at the box and it read 4035 and 4036. When I took the calipers back it was evident what the problem was (the huge lip that was not on the 4045 caliper). Now I have a knuckle that has been ground down so much I can see the threads of one of the seal plate bolts. I did not go to deep into the knuckle it was mostly the 2 bolt areas that were keeping the wrong calipers from fitting. The bolt still is able to be tightened do you think this will be a problem or is it something that I should not worry about? I was able to get some loc-tite on it and torque it down pretty good. All of the other seal plate bolts are fine.

 

if the bolts are tight i would not be too concearned, that is unless it is so thin you think it might break off

 

ok after searching numorus threads, that cover everything from RPV's to brake line size, rear brake adjustment, i have not found the answer. now i am still running the single resivor MC. and i had good pedal with drums all the way around. now it goes to the floor on the first pump, the second pump it goes about half way down. i can smoke the front tires on the second pump so it appears to have enough pressure to get the job done. but i did notice when bleeding the calipers there is not as much pressure as i was expecting. so what gives?? still got air in the system?? 3/16 lines and that is the same size my chevy has going to the front brakes, so i dont think line size is a issue. and by having good pedal with drums at all four coners i dont think the rear brakes are out of adjustment. my only thought is that it may still have air in the system, the MC is almost the same height as the bleeders on the caliper, so you think that would casue the brakes to be that big of a pita to bleed? thoughts, sugestions???

 

from my understanding the single resivor MC for drum brakes has a residual valve in it already. that should be a problem with the front brakes dragging as it is a higher pressure valve for drum brakes. or did i misunderstand something in my reading?