Full floating rear axle disc conversion (1 Viewer)

[LevShep]

Greeting everyone,

Has anyone with a full floating fj45 rear axle ever successfully converted the rear drum brakes to disc breaks?
The available kits for sale online that I can find state that they're for semi floating axles only.
Thanks in advance.
Regards.

 

[Mark W]

Yep.
What vintage is your axle?

Mark...

 

[LevShep]

Yep.
What vintage is your axle?

Mark...

1978 fj45

 

[Mark W]

I have a home brewed setup on my 1978 FF rear. I came across the conversion here on mud about 25 years ago. I would expect the write up can still be found here somewhere.
Basically you sacrifice a pair of front disc brake knuckles to make the mounting bracket for the early FF rear. Once you make the mounting bracket from the outer face of the knuckle, it is a straight bolt on and uses OEM Toyota calipers and rotors. The hub gets machined down a tiny bit so that the rotor fits over it just like it does on the front hub.

Very straight forward, very clean and very simple. On my rig, I used the 4Runner calipers front and rear, but what works as well is to upgrade your fronts with the 4Runners and move the original '40 series calipers to the rear.

This gives you fixed four piston calipers at both ends of the rig.

Mark...

 

[POPO AGIE]

I converted a FJ60 rear axle to full floating with flanges from FROR in CO. The flange welds to the axle tube and is ready for Toyota stock calipers and
Toyota front spindles. We stitch welded the OD to the OD of the axle tube and the ID to ID of the tube. Worked well. You don't install the bronze bushing in the spindle but install a seal holder instead. I ordered double splined axle shafts from FROR and found instructions to get the measurements for the shafts but were still too long but just trimmed the length to work with the drive flanges from FROR. I have photos in my Rebuilding Trusty thread.

 

[POPO AGIE]

I have a home brewed setup on my 1978 FF rear. I came across the conversion here on mud about 25 years ago. I would expect the write up can still be found here somewhere.
Basically you sacrifice a pair of front disc brake knuckles to make the mounting bracket for the early FF rear. Once you make the mounting bracket from the outer face of the knuckle, it is a straight bolt on. uses OEM Toyota calipers and rotors. The hub gets machined done a tiny bit so that the rotor fits over it just like it does on the front hub.

Very straight forward, very clean and very simple. On my rig, I used the 4Runner calipers front and rear, but what works as well is to upgrade your fronts with the 4Runners and move the original '40 series calipers to the rear.

This gives you fixed four piston calipers at both ends of the rig.

Mark...

That is pretty much what I did to convert the FJ60 axle to full float but I used my old wheel hubs and then used NAPA reman calipers and got slotted rotors.

 

[bikersmurf]

I had custom mounts fabricated and welded to the axle ('77 Fj45 FF) about 26 years ago. I used '77 blazer rotors and calipers. They are held to the rear of the hub with longer 60?? series (newer Toyota Landcruiser for sure) studs. The radius on the back of the hub flange had to be machined to allow the rotor to seat. Worked great once the adjustable proportioning valve was dialed in.

 

[Downey]

When Downey Off Road Mfg. was in business we made a special kit for the FF rear ends using the GM calipers with built-in parking brakes. I'm" not sure, but I think when we closed Downey we gave the FF parts or drawings to "Poser" here on Mud since he had already started making disc brake kits ?????

 

[Nathan Vollrath]

I had some custom bolt-on brackets made to use Toyota calipers and discs because I like my LC to be Toyota even if it isn't pure LC. Used 1985 FJ60 vented rotors, 1996 4Runner calipers for the extra force, and had a friend turn down the OD of the back side of the factory rear wheel hubs so the discs would slide over them. Also have to use the longer disc brake wheel studs since they now have to go through the discs and the hub flange. I'm happy with the results. Have not yet done but intend to replace the master cylinder with a 1991 FJ80 unit from one that had discs fr & rr but no antilock brakes, and add a Wilwood proportioning valve so I can adjust as I like.