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Sounds like it, if it's shimano whack the bleed cup on and pump it a bit and any bubbles will likely burp out.
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Yup, what the others said.
It may help to move any air bubbles to the lever end of the system by holding the bike up towards you and bouncing it on its rear wheel while pulling and releasing the lever.
The lever will firm up and all the air will all be in one place ready to bleed
snottyotter
MTB-Idle
@andyp
The rear brake on my cross bike is playing up a bit, it loses pressure frequently, but is rectified by a few pumps of the lever. It's then fine until it's left for a bit, then you have to repeat.
Am I right in thinking there is probably some air in the system that is the root cause?