C4 Corvette Caliper Pictorial
Below are some pics and descriptions that show some of the
differences between the later ('88-'96) C4 calipers.
Click on any image to see a larger version.
Pics of the JL9 (12") caliper:
Pics of the J55 (13" Non-GS) caliper:
Pics of the GS (13") caliper:
Noted differences between JL9 (12") and J55 (13") Caliper:
As you can see below, the major difference between the J55/GS and the JL9
caliper is the width of the throat where the rotor resides. The J55/GS caliper
is the one on the left and is about .5" wider than the JL9.
Noted differences between J55 and GS Caliper:
It's very hard to tell in this pic but you may notice that the rib running
between the piston cylinders is deeper on the J55 caliper then the GS caliper
however the GS calipers rib is a bit wider.
There are a couple of differences noticeable in this pic. First, the ribs on
the top of the calipers. The J55 has more ribs but they are thinner than the
ribs on the GS. Second, notice that the triangle shaped leg on the J55 caliper
is not present on the GS.
Main difference here is that the GS caliper is smoothed with the "CORVETTE"
logo unlike the plain, ribbed J55 caliper.
Another view of the top of the calipers showing the difference in ribs.
Jeff Kopp
Superior Chevrolet
Wholesale Parts Manager
18carfan on corvetteforum
