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Mismatched calipers and rotors


calvinhg

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I'm about halfway through upgrading my brakes and just noticed the rotor is way too thick for the caliper.

IMG_20231118_123149.jpg

IMG_20231118_123201.jpg

One side already has the rotor installed and I painted both calipers. Calipers are AC Delco 18FR247 and 18FR248 for an 85 4runner. They have S12-8 stamped on them. 

IMG_20231118_124414.jpg

I got the rotor from silvermine as well as the spacers.

Did I get the wrong calipers? Or am I supposed to just run the stock rotors? 

Edited by calvinhg
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The page you linked says the rotor only works with the Stage 4 kit.  The Stage 4 kit page says that the calipers are huge.  Can't tell what brand they are but that looks like the cause of your problem.

 

Description

-

Stage 4 drilled, slotted and vented rotor.

This rotor is zinc plated to prevent rusting.

10.8 inches in diameter. 22mm thickness.

Only work with stage 4 front brake kit.

https://www.silverminemotors.com/products/stage-4-front-big-brake-upgrade-kit-240z-260z-280z

This brake kit comes with the following parts:
1. Enormous 4 piston calipers (43mm pistons)

image.png

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I went to O'Reillys and matched the uninstalled rotor with calipers for a 91 4runner v6. There are two options for 91: 

- to 05/91 (pn 19-1240 and 19-1241) that had s12w stamped on them

- from 06/91 (pn 19-1600 and 19-1601) that had s13w stamped on them

The rotor fit on both. The only difference I saw was the piston size: 42.7mm on the s12w and 45.3mm on the s13w. 

Didn't buy them because they were just the basic O'Reilly brand but now I know what I need. 

Edited by calvinhg
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Sounds like you sorted this out but it was my understanding that the +8 caliper was for the non vented stock rotor and the W was for the wider vented rotor. 

I have had mine on the non vented rotors for some years now and may recall incorrectly. 

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