Old P38 2001 V8 has had the 3 amigos for a while ABS t/C and handbrake light..

Initially I thought it was the accumulator, the abs pump would run for every peddle press, new accumulator fitted and it only runs after 10 pedal presses.

However the lights are still on...

Unfortunately I don't have a nanocom, any ideas as to what the issue could possible be..

I have noticed that if you put moderate pressure on the brake pedal it hits a "hard spot" and then sinks over an inch downwards..

Could air in the system cause an ABS issue? possibly.

Thanks.

Could be air, bleed it as per the book and see if that cures it. It should at least cure the sinking pedal.

Do you get a "traction failure" message?

Where abouts are you, you really want to get a nanocom on it, although the handbrake light is a bit of a clue as its driven directly by the pressure sensor, perhaps its faulty? I think the sensor has a couple outputs, a "medium" pressure one that switches the pump on/off, and a "low" pressure one that brings on the warning light.

Might be worth checking the wiring diagram and having a probe?

It's the TC light that shows low pressure, the red brake light shows that the handbrake is on (conventional switch under the lever) or low brake fluid level (from the sensor on the reservoir).

ABS Fault will normally be followed by Traction Failure as if the ABS isn't working the traction control won't be either. If ABS Fault comes up as soon as the ignition is turned on and before the engine is started, it is failing the initial self test so it might be nothing more serious than an open circuit wheel sensor. If it comes up only once you start moving then it is detecting one sensor giving a reading different to the other three.