This JK brake master cylinder compensates for the larger caliper piston size with an oversized bore that has 14 Percent more flow to provide greater fluid volume to the front Big Brake Kit. We highly recommend this master cylinder for 2007-2011 JKs with the Big Brake Kit to provide a firm pedal feel. 2012+ JKs do not need this kit. Fits:
07-11 Jeep Wrangler JK
07-11 Jeep Wrangler Unlimited JK
JK Brake Master Cylinder Kit w/Oversized Bore
Has 14 Percent More Flow To Compensate Larger Caliper Piston Bores
Needed For Big Brake Kit To Provide Firm Pedal Feel
Not Needed For 2012-Present JKs
Specific steps must be taken when bleeding the brake system, a bench bleed is recommended before installing the master cylinder into the Jeep. Slowly pump the pedal during the bleed process to avoid seal damage.