Were 1975 FJ40 front disc rotors solid?

[mjosco]

I picked up a used disc brake FJ40 axle to use for parts for my HJ45 front Drum to Disc conversion. The axle I got has solid rotors on front. Was this a 1975 only fj40 front axle? I see 1976- used vented rotors.

I want to convert to vented rotors and the V6 Truck calipers. Can I convert just by buying 1982 front FJ40 rotors and 1990 Toyota V6 truck calipers? Getting ready to order parts and want to make sure I get the right stuff.

I know I don't have an early mini-truck front axle since the Diff is the larger version.

I read all the Mud and Pirate faqs and could not find the answer for this combo.

Thanks!

 

[Living in the Past]

75 were drum brakes. If it has disc brakes it was a conversion done later. 76 model was the first disc brakes on the front. Early mini truck had solid rotors.

 

[pjohnson]

Your disk brake front axle could have already been converted using solid rotor mini truck parts. I am not certain about the V6 calipers, but I'm pretty sure you can swap in the vented rotors.

This may provide more info:
Disk Brake conversion links

 

[mjosco]

OK, must have been converted to the solid mini truck disc then. I will upgrade to the vented rotors and V6 calipers and see how it goes.

Thanks for the reply.

 

[bikersmurf]

Yes, you can convert to V6 calipers. The will, however, need to be ground to clear steel rims. They use 4 equal sized pistons for theoretical better braking than Landcruiser calipers.


The stock 76 calipers with Chevy (full sized) rear discs will easily stop my 4500 lb truck towing a 4000 lb trailer without the use of trailer brakes. Moral... I feel the upgrade to V6 rotors is unnecessary if your Fj40 rotors are healthy.

 

[74HogGuy]

V6 4-Runner calipers are Autozone part numbers:
C8464
C8465

Just finished up this conversion and it’ll stop on a dime! I didn’t have to grind the caliper with my stock steelies.

 

[4Cruisers]

The axle I built for my '71 FJ40 uses FJ60 vented rotors and V6 4-Runner calipers, I believe from a '91. The Birfields/knuckles/etc. are from an '84 mini-truck.

 

[mjosco]

OK, so the combo I will be trying is 79 mini truck knuckles/birfs, 82 FJ40 rotors, 90 V6 Truck caliper, 82 brake lines, backing plate eliminators.

Will let you know how things came together this weekend.

 

[bikersmurf]

There are two versions of vented rotors. 76-77 mount using 6 bolts to the back of the rotor. 78+ mount with the wheel studs going through and two bolts (8 holes). You'll have an easier time if your discs match the hub.