Another rear disc conversion question.....

[1911]

I went with that same master cylinder on my 76 and used the tsm manufacturing rear disc kit but upgraded to 4runner calipers in the front and do not use a proportioning valve. no issues braking at high speed and it has worked fine for about 10 years now. and the 4runner calipers fit fine with my 15-inch wheels.

Do you remember what year of 4Runner calipers by any chance?

 

[lone gunman]

not off the top of my head but i found all the info on here somewhere. if i can find it i will link it up, the site has changed a bit since i was last here so still figuring things out.

 

[Godwin]

Do you remember what year of 4Runner calipers by any chance?

I don't remember the range of years but 1995 is within that range. I have 4Runner calipers on two FJ60s and I settled on the 1995 year because it is easier for me to remember than a range of years.

 

[1911]

I don't remember the range of years but 1995 is within that range. I have 4Runner calipers on two FJ60s and I settled on the 1995 year because it is easier for me to remember than a range of years.

Thanks Jim.

 

[SMG]

Did you design the bracket yourself? Just curious. I did my own because I found that some of the files floating around were not very accurate.

Sorry for the late response. This is the thread where I found the brackets. All I had to do is convert the files into a DXF so I’ll it would talk with the water jet. I did however make the holes a little smaller to account for the kerf from the water jet.
Once the brackets were cut, I reamed the holes open to the proper size.

Brackets for Rear disk conversion

Whoever drew these up did a nice job.

 

[1911]

So I used the 40-forum FAQ and the "search" function and found that you want V6 4Runner calipers in the range of 1988-1995. @Godwin 's way of remembering is still correct and easier.

There are a number of threads dealing with this swap; I found this one by @brooklyn to be very informative: https://forum.ih8mud.com/threads/4-piston-4runner-calipers.521704/#post-6987859
He includes part numbers.

Apparently you either need to grind the 4Runner calipers or use 1/4" wheel spacers for these to fit under stock 15" wheels.

I am going to do this swap, whenever I can use my shop again (empty it of all our furniture and house stuff).

 

[SMG]

So I used the 40-forum FAQ and the "search" function and found that you want V6 4Runner calipers in the range of 1988-1995. @Godwin 's way of remembering is still correct and easier.

There are a number of threads dealing with this swap; I found this one by @Spike Strip to be very informative: https://forum.ih8mud.com/threads/4-piston-4runner-calipers.521704/#post-6987859
He includes part numbers.

Apparently you either need to grind the 4Runner calipers or use 1/4" wheel spacers for these to fit under stock 15" wheels.

I am going to do this swap, whenever I can use my shop again (empty it of all our furniture and house stuff).

Thanks for the info!

 

[Bluegrass40]

Sorry for the late response. This is the thread where I found the brackets. All I had to do is convert the files into a DXF so I’ll it would talk with the water jet. I did however make the holes a little smaller to account for the kerf from the water jet.
Once the brackets were cut, I reamed the holes open to the proper size.

Brackets for Rear disk conversion

Whoever drew these up did a nice job.


View attachment 1714348
View attachment 1714349
View attachment 1714350

I started with those but when I cut out a test set, I had some alignment issues. I designed and modeled my own set. If you have any problems with those, shoot me a pm and I’ll share the .dxf.

 

[Bluegrass40]

FJ40 cad file collaboration/sharing via onshape

 

[Bluegrass40]

'78 FJ40 Project - In the Blue Grass

Scroll down to the bottom of page 4 for a link to the file.

 

[SMG]

That’s really weird.

Mine fit perfectly.

 

[Godwin]

So I used the 40-forum FAQ and the "search" function and found that you want V6 4Runner calipers in the range of 1988-1995. @Godwin 's way of remembering is still correct and easier.

There are a number of threads dealing with this swap; I found this one by @brooklyn to be very informative: https://forum.ih8mud.com/threads/4-piston-4runner-calipers.521704/#post-6987859
He includes part numbers.

Apparently you either need to grind the 4Runner calipers or use 1/4" wheel spacers for these to fit under stock 15" wheels.

I am going to do this swap, whenever I can use my shop again (empty it of all our furniture and house stuff).

When I've replaced 60 series OEM calipers with 4Runner calipers the only mod I've had to do was enlarge the backing plate opening. I've not had to grind the 4Runner calipers for fitment with either stock FJ60 wheels or an aftermarket wagon spoke wheel, both are 15" and no spacers have been needed. I have not tried this on FJ40 knuckles so do not know if spacers are needed.

 

[1911]

When I've replaced 60 series OEM calipers with 4Runner calipers the only mod I've had to do was enlarge the backing plate opening. I've not had to grind the 4Runner calipers for fitment with either stock FJ60 wheels or an aftermarket wagon spoke wheel, both are 15" and no spacers have been needed. I have tried this on FJ40 knuckles so do not know if spacers are needed.

Good news for me; I believe my 1980 knuckles are the same as 60 knuckles.

 

[FJ40Jim]

I just put a set of the heavily finned 4Runner calipers on a FJ40 frt axle w/ later FJ60 knuckles and old (1976?) stock 15x5.5 steel wheels. Surprisingly, there was no need for any grinding or spacers.

I've put those same calipers on a number of trucks with various aftermarket wheels and had to do varying amounts of grinding to clear the wheels.

 

[lc69hunter]

Ok, so this has probably been asked before or maybe this would be a good question in the FJ80 section.

I am currently in the middle of a rear disc conversion on my 76 FJ40. Do I still need to run a proportioning valve if I am using a early 90’s FJ80 master cylinder?

One would think that because the FJ80’s came with disc on all for corners, that maybe it’s all ready built into the master cylinder.

Can someone please chime in that’s running this combo?

Thanks!!

Test fit.
View attachment 1713590

No. I am running the same setup, along with a booster from a 74. No proportioning valve necessary.

 

[handcannon]

Whether or not a proportioning valve might be needed is a real guess. If you don't use a P. valve and then have to put one in it is a lot of extra work. Why not put one in from the beginning and save possibly having to do the work twice. I put in a P. valve and was very glad I did when I did a GM rear disc brake swap.

Nobody has said anything about adjusting the valve. I have a long gravel driveway that I used. I would get up to 15 to 25 MPH (guessing) and then dynamite the brakes, adjust the valve, and keep doing this until I had what I was wanting. What I was looking for was the front brakes locking up before the rears. Once close a bit of fine tuning will be needed, and this will involve your own personal taste in braking performance.

Don