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Brake upgrade "Jonathan Mod"

PostPosted: Thu Jan 03, 2008 4:44 am
by 4g4door
Jonathan Mod

Well guys...you'll be glad to hear that it isn't necessary to hunt down those scarce EX knuckles to upgrade to 10.2" brakes. This bolts onto the non-EX 88-91 Civic/CRX knuckles!
Want to know how it's done?

Read on below to discover the beauty of the Jonathan Mod

Parts list:

    '91 Civic EX Brake rotors...same as 92-95 Civic Sedan rotors ($14.99 each at Pep Boys; probably cheaper at AutoZone)

    Accord Wagon Brake Calipers (will be stamped 17CL15VN; ~$50 rebuilt at Pep Boys). These are the exact same calipers as the ITR, Legend, Prelude VTEC etc. Great stopping power!

    Accord Wagon, Prelude VTEC (etc) Brake Caliper mount stamped 25T (a 23T bracket exists, but I can't promise you it will work). This is what came stock on the Accord Wagon.

    1/8" wheel spacer OR grind ~1/8th" (2.5-3mm) off of the caliper mounting bracket. If you are familiar with the 11" brake upgrade, this is the same modification necessary.

Now, the installation...

First, you need to place the wheel spacer (or washers if you're ghetto) between the hub and your new 10.2" brake rotor.

OR shave off the ~1/8" necessary from the caliper bracket

Next, Install your rotor, mount the caliper, load the pads....(you know how to do all this) and enjoy your upgraded brakes!!!

15" wheels fit fine. If any of you have 14" wheels, you may want to see if they'll clear. They may not.

So you end up with the same rotor surface area as the Integra/EX upgrade, but you're upgrading to ITR quality calipers, larger pads etc. Not too shabby!

You can instead opt to shave 2.5mm off of the caliper anchor bracket if you don't want to run a spacer.

NOTE: I did not write this article. I found it and thought I would share it with every one who doesnt know about the so called "Jonathan Mod".

Re: Brake upgrade "Jonathan Mod"

PostPosted: Sat Sep 08, 2012 6:20 am
by gregy
wasn't familiar with this jonathan mod but I got a lot of ideas here haha, thanks for sharing

Brake upgrade "Jonathan Mod"

PostPosted: Thu Aug 30, 2018 7:45 pm
by Hinige
i think i need to do a brake job soon. 60k miles on the original pads and rotors i assume at least the pads need to be replaced.

how does one tell if the rotors need to be replaced too. There is at least a penny sized lip on the edge of the rotors so i could they still be turned instead of getting new pads or what?

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