Accumulator.
Easy to change, no bleeding even required.
I had the same problem. It can take up to 45 secs to braking power. I hit a few fences and garbage cans when it came on fairly suddenly. One is so used to having braking capacity at start up, it's easy to hop in to move the car a few feet then find you can't stop it.
Get in the car, leave it in Park, release the handbrake, and turn on the ignition. Time how long it takes for the brake light to go out. It should be under 45 secs. If you leave the handbrake on, the light will stay on until the handbrake is released - that's why you need to release it before you start the test.
I've got a light on my dash to tell me when the brake pump is on and also one to tell me when the EAS compressor is running.


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