Big Brake Upgrade Question

FLCoastJK

FLCoastJK

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Joined
Dec 28, 2020
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Destin, FL
Being an mechanical engineer, I might be over-thinking this but...

I installed the Crown big brake with dual pistons and am pretty sure I got all the air out and also bled the whole system. The pedal feels like it goes further down to stop than previous stock setup did. I did not change out the booster. Is it due to a higher volume of fluid needed to push the pistons (more area)? Do I need to get a bigger booster? Am I just imagining things?

Thoughts appreciated.
 
There is a thread on here about the big brake kits. A lot of people have upgraded the booster and master cylinder when they go to a dual-piston caliper. The j8 kit has a huge booster and a master cylinder with a slightly larger bore then what comes stock an 2012 plus JK's.

I have the kit, but I have yet to install it. My brake pedal feel is only slightly soft not sure what the differences would be why some have it spongy and others a bit more firm. The new booster will definitely make a difference.
 
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Yeah we talked about this in the other thread. At least I thought we did. With the Dual Pistons it's going to soften up the pedal somewhat.

Remember, just empty every pocket.
 
JerryD said:
Yeah we talked about this in the other thread. At least I thought we did. With the Dual Pistons it's going to soften up the pedal somewhat.

Remember, just empty every pocket.
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You had mentioned that before, just was wanting to get anyone else's thoughts too. I don't feel I need the booster but might change my mind down the road.
 
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