Brakes firmer/more responsive on second pump

[AHenry014]

When i got my JTR, I noticed that the brake pedal seems to travel a bit farther than I am used to prior to braking the truck. I have gotten used to it and the brakes work fine, but I have noticed that the brakes firm up/become for responsive on the second pump. This would normally mean air in the system, but I would be surprised if that were the case. I found a thread over on the JL forum with folks having the same "issuse" and the dealer not having a solution:
https://www.jlwranglerforums.com/fo...-the-brakes-twice-to-get-a-solid-pedal.34578/

Does anyone experience this?

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[Lunentucker]

I came from Tacoma with drum rear brakes. Trust me. The Jeep brakes are fine.

 

[AHenry014]

I came from Tacoma with drum rear brakes. Trust me. The Jeep brakes are fine.

My work truck is an '87 F250 with a 12v cummins swap. Giant drums in that Sterling 10.25 and mediocre disc's up front. Stopping that truck loaded is no easy task. Towing >5000lbs finds the limitations of that 35 year old technology pretty quickly (I really need to install that brake controller). The Gladiator brakes are MUCH better than those, and its always stopped when I told it to, just curious of others experience with it; am I crazy (doesnt sound like it) and can it be fixed (seems not, at least not that Jeep has recognized).

 

[Red Hot Sloth]

Funny, Im in the same boat, I do the double brake pump since new. For some odd reason its comforting knowing Im not alone.

 

[ShadowsPapa]

This would normally mean air in the system, but I would be surprised if that were the case.

I've had that on multiple 4 wheel disk vehicles............. in the older days it was because it takes a lot of fluid to fill the caliper bores and push the pads out against the rotors again and if you let up and hit 'em again quickly, they don't retract fast so the second time the pedal is up because it doesn't need to move the pads out.
It was even that way in my Silverado and a couple of Grand Cherokees I've had.
The ABS on these may play a role, too.
Plus - frankly some of it IS design. These sense the pressure you are applying to the pedal for multiple reasons - one of them is the ESS everyone hates. So the brake switch isn't on/off, it's more of a pressure sensing switch. You can control it with the amount of pressure you apply to the pedal. So it's never going to feel like some other vehicles.

I've worked brakes for decades and guess I never saw it as a problem on these, it's just a little different. I don't even notice it any more.
It's not a problem - the pedal doesn't go "too far" and it brakes just fine - even in mountains, towing, whatever.

 

[ShadowsPapa]

You can reference my profile pic. Giant drums in that Sterling 10.25 and mediocre disc's up front. Stopping a cummins powered full size pickup is no easy task. Towing >5000lbs finds the limitations of that 35 year old technology pretty quickly (I really need to install that brake controller). The Gladiator brakes are MUCH better than those, and its always stopped when I told it to, just curious of others experience with it; am I crazy (doesnt sound like it) and can it be fixed (seems not, at least not that Jeep has recognized).

Stop a 1970 Ford grain truck with a load of wet corn......... field to farm storage, a person could haul as much as would fit in the box - so I did.

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