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We have a brand new P100EV (less than 75 hours), and on three separate occasions have been sidelined with a "Low Emergency Brake" CAS. It appeared again yesterday. This morning, I ran the scheduled hydraulic test, and it appears that the nitrogen level is low in the accumulator. The entire system was serviced one month ago at the last AOG event. My question is how often should I have to recharge the nitrogen level in the e-brake accumulator? It only flew about 10 hours in the intervening time period, and it is always stored with the e-brake off. Is once per month too much, aka I have a leak?

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Hmm, that doesn't sound right, I think our Nitrogen goes annual to annual and maybe beyond. The parking brake shouldn't be using it under normal circumstances, sounds like you may have a leak somewhere.

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When I took delivery of my new 100EV a few years ago, I had the exact same problem. Embraer would replace a part and then do an overnight test which the aircraft would pass. A month later, it would need a recharge. Obviously the test wasn't long enough or sensitive enough. They replaced the accumulator with a refurb and the problem got worse. Finally, I had it to Duncan and they insisted on replacing it with a new accumulator (not a refurb) and I have never had to add N2 since other than at regular service events.

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Agreed... its a leak or faulty accumulator. These are basically the same devices that modern cars use to hold the Parking Brake. It should be pratically serviceless over years.

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Agree that it’s a probably an accumulator leak. Since your jet is still under warranty, you should be able to get a new (not refurbished) replacement.

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It is a fact that you have a nitrogen leak.
We usually find leaks in the tubes (permaswage sleeve) between the filling point and the accumulator.

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I'm flying a new P100EV that was delivered in December of 2022 - This airplane had identical symptoms, and after recharging the PB accumulator with nitrogen two or three times, we had it replaced at Eagle Creek just last week with a new one. Since it tends to take a few months for the leak to become apparent, time will tell as to whether this solved the problem, but it was replaced with a new and not refurbished unit.

Jim