4Runner 4 Piston Caliper Upgrade on 94 ST, My Cheap big brake upgrade (Project) Options

[hdnseek]

So i have read many threads about gt-4 caliper upgrades but i dont have the money to spend on a pair of gt-4 calipers. I read a few articles on a completed 4runner 4 piston caliper on a gt, his setup included shaving off the inside of the caliper to accept the thicker gt (smaller) gt disc. I wanted to find a solution that was a little more simple and find rotors that will fit without redrilling. i got on the wheel fitment database and found all the cars that have 5x100 bolt patterns, after doing alot of looking i found the rotors i was looking for. After reading the information from the gt-4 upgrade, and how the mounting points on our knuckles limit the rotor dia to 300mm i wanted to get as close an i could to 300mm, noting that the 4 runner calipers are alomst identical to gt-4s, except for the fact that they require a smaller thickness disc of 22mm compared to the 32mm disc on the gt-4. So i came up with this



The S13WM Calipers mate with the 22mm nom thickness 4runner rotors, and a 17mm thickness pad after 11/95.
To make up the 2mm greater thickness rotor on the subaru i looked at pad options for the 4runner calipers. I found that the 8/95 to 10/95 pads for the s13wm rotors were 2 mm thinner and 3 mm wider than the after 11/95 pads, which makes up the difference in the subaru rotor and adapts to the 294.5 mm dia rotor so more pad surface!

The only modifications i will be looking at if everything goes like planned will to be tap the st knuckle, grind off 2 mm-4mm from the caliper mounting points (depending on whether 2mm will clear the ball joint or not, if it does not i will have to grind off 2 more mm (total of 4) and put a 2mm spacer behind the rotor) to clear it.

I will start this project soon, just thought i would share my food for thought, and suggestions, info are greatly appreciated!

This post has been edited by hdnseek: Dec 8, 2014 - 12:21 AM

[JoshuaM]

I don't really have anything constructive to say, other than it looks like you have done some good research and will watch your progress

[njccmd2002]

if this works out, good to know there will be good progress.

[Syaoran]

Hope to see more progress on this

[hdnseek]

My local juckyard has a set of s13wm caliper for 40$ so I going to pick them up Thursday and grab those rotors from my local parts store to see how they will line up! I will keep everyone posted!

[hdnseek]

looks like i will find an answer for sure, put on ss lines and redid rear brakes tonight, front bleeder screw snapped off in both front calipers, tried extracting them and they were in there so good it snapped my screw extractor too, thats what 224k and 21 years will do to them. i called the local salvage yard toay that i went to pick up the 4runner caliper, they had the incorrect caliper, called another one which had the correct one, they pull there own parts off so they will have that ready for me saturday, i will get pics as soon as i get parts home.

[Marsstar505]

Any word on the progress of this. I have a set of those calipers in my garage extra with brand new pads and just need rotors if it works.

[cjh4l22]

this will be fantastically awesome if it works.