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  • Bleed the brake lines better

    Votes: 1 33.3%
  • Get a larger master cylinder

    Votes: 0 0.0%
  • Add more bacon to my diet

    Votes: 2 66.7%

Teraflex Big Brake Kit - Master Cylinder Needed?

5K views 6 replies 4 participants last post by  Commodore Perry 
#1 ·
I installed the Teraflex big brake kit on my 2013 Rubicon this weekend. Easy install and went really smoothly. The brakes and rotors are serious equipment!

I took it out today to test drive and the brake pedal is very spongy.

Engine off the brake feels very firm and the pedal stays hard.

Turn on engine and there's some pedal resistance but not a lot and I have to push the pedal most of the way down. It brakes fine though, just not much pedal feel and have use most of the brake travel to stop.

If I pump the pedal while I'm slowing down it gets a lot more firm and feels like normal (before new brakes) pedal resistance and the braking is what I expected it to feel like - good firm pedal but with increased grab from the new larger brakes.

I bled all four brakes and even did two rotations (back left/back right/front right/front left) so I *think* I did an adequate job of bleeding.

The Teraflex catalogue specifically says '12+ JK's "do not need" the bigger master cylinder; but I wonder if I do need it.

Has anyone installed the big brake kit on 2012 or newer JK and had similar experiences? What does everyone think? Do I need to do a better job of bleeding or do I need the bigger master cylinder?
 
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#4 ·
Actually Teraflex says some 2012+ "May not need their bigger master cylinder, but some may." I have the same setup as you. Everyday driving I do not need to pump the brakes but when I'm coming down step descents while wheeling I do have to give the pedal a couple pumps to get a firmer pedal. I'm considering their master cylinder to see if it helps and a rear big brake kit.
 
#5 ·
Try to gravity bleed them;
1)open reservoir cover and make sure it's full(keep open)
2) open all bleed points at calipers
3) sit back and enjoy your favorite beverage for 30 -45 minutes
4) during that time keeping sure that the level of fluid at the reservoir remains full and fill as needed.
5) close all bleed screws
6) refill reservoir and your done.
been doing it this way for 30 years and never had an issue to my recollection.
 
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