5th gen front calipers and rotors on 4th gen?

ch1414

Junior Member
Hi everyone, feel free to make fun of my search skills if i missed the answer here or anywhere else on the net. My research so far is showing the 5th gen rotors are 338mmx32mm instead of 338mmx28mm (sport and some limiteds) and the 5th gen caliper pistons are 4x48mm instead of 4x45.5mm. Has anyone looked into whether these will physically bolt up to our 4th gens?

Optional background: I am perfectly satisfied with the braking on my 2005....so much so that i am considering upgrading my solid axle truck to the same brakes using the front range off road brake adapter (the $129 version)...while looking at the 2005 brake specs, i checked out the 5th gen brake specs and saw they were different...if the mounting is similar, the 5th gen brakes would also work with the fror adapter and i would use them on my solid axle instead of 4th gen stuff. I haven't asked the guys at fror yet, because i thought i would try here first.
 
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I'm curious about this. I know the bolt pitch will be the same, the question is the length. I don't think I've seen any 5th gen calipers yet with issues. Could just be a matter of time.
 
I'm also curious because of the 4th Gen seized caliper pistons.
Is the 28mm the thickness measurement? If so, then this will have an impact on the lateral offset of the disc faces to the hub datum which in turn may impact the lateral distance to the caliper mounting datum.
What is the a casting code on the 5th Gen caliper?
 
Yes...my understanding is the 4th gen rotors are either 319 or 338mm in diameter and 28mm thick....the 5th gen rotors (at least v6...i didn't bother researching the 4cyl. ones) are 338mm in diameter by 32mm thick. The 4th gen caliper casting code is s13wg for small...s13wh for the large. The 5th gen casting code is s14wa. I have thought about checking the toyota spindle/knuckle/caliper mount part numbers, but i haven't had time yet...
 
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