I installed the JK-8 brake booster and master cylinder this weekend. Wasn't that bad of a job, the worse part was getting the new stuff back in. Anyways, I noticed right when I was done that the brake lights were on so I went back under the dash to see what was going on and the brake pedal physically will not pull back far enough to hit the little plunger that turns it off. It gets right there to it and actually may even barely touch it but cant travel far enough back to turn it off.
This sound normal to others that have installed this?
Second part, I bench bled the master cylinder but when you go to install it the ports are open for a few seconds and stuff drips out. I don't see how you CANT get air in the system right there. I used a power bleeder to bleed the system as I installed new calipers as well, the style I have pressurizes the reservoir on top of the master cylinder. I feel that I did a really good job but I am scared that I got air in the ABS module. Thoughts?
As others mentioned, the brake light switch will self adjust after you pull the plunger out. Re: your second question, there's little risk that you got any air into the ABS system. The spools in the ABS module default to closed when ABS is not actuated. They seal well enough there's little risk any air got in there. After replacing brake lines I once had the local deal do the Star Scan ABS bleed routine and ther was no difference in brake performance. I no longer even bother if I have to crack open the main braking system. A year or more ago I installed the Mopar Master & Booster kit and did the same install procedure as you, bench bleed + pressure bleed. The brakes are much improved. I have them combined with Teraflex's BBK in front, outstanding.
'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.