Complete kit with everything needed to convert your:
July 1970 through until 1985 FJ40, FJ45, FJ55, FJ60 or FJ62 to front disk brakes.

This company:
Specter Off Road sells this same kit for $775 without a new seal kit or brake proportioning valve!!

We sell this kit for $450 complete with a new knuckle seal kit, a used proportioning valve, new TRE bushings.
Shipping is $75 to $100 depending on your location. These ship in 2 boxes weighing 100#'s each.

Some companies are selling modified GM parts. Some are using the light duty 4x4 pick up parts. Why not use the original heavy duty disk brakes? These use vented rotors and 4 piston calipers.

For an extra $50 we can include a New set of rotors.

Extras to renew your front steering while upgrading:
New pitman arm kit - $15
New center arm kit - $74.99
New rag joint - $24.99
New TRE, Relay Rod end kit - $89.99

To order this needed upgrade for your early style cruiser just click here.

We cut the actual axle housing of the donor Land Cruiser as shown in photos.

You need to dis-assemble the knuckles off of your FJ40. Get down to just the bare end of your axle. Then dis-assemble what we send to you. Clean everything up, derust it, degrease them, paint the parts then start reassembly. You do not need to cut or modify your axle housing at all. You CAN re use your original booster & M/C just use the proportioning valve that we send. New loaded calipers are available at a local auto parts store. We highly recommend buying a set if the ones included in your order look questionable. They are generally $55 each. If you need replacement parts in the future. Order them for a 1985 Toyota Land Cruiser.

Read the below web page. The below link details a kuckle rebuild but is generally the same steps as installing the disk brakes.

FJ40's http://www.birfield.com/~morgan/tech/axle/index.html

Reference photos: