Dear Ken,
This is quite a complicated system and no amount of emails is really going to help you unless you completely understand the system and are able to recognise what is going on.
Your owners manual provides some information but it is not written well.
Important to remember that you MUST make sure the brake boost hydraulic pump is working correctly at all times. If this fial you will have brake problems, serious ones.
The combination of lights you have is saying you have a brake fluid pressure problem.
It is normal for these lights to be on at first start up of the day and stay on for up to 60 seconds and they go off. If they are staying on do not drive the C4.
The system will hold pressure for 4 hours or so after the engine is shut off.
I strongly recommend you puchase my book on the 964 called Porsche 911 Enthusiasts Companion, from Bentley.
The entire system is explained, how to troubleshoot it what to look for etc etc.
Even checking the brake fluid level requires more than just looking at the fluid tank and saying, oh it is okay.
Ciao,
Adrian
Switzerland.

Dear Ken,
I would tend to agree because most likely the problem is the pressure switch. Because the warn horn is coming on this tells me it is a pressure problem.
I would advise that you check the electrical system, battery voltage and the battery capacity. 964s eat batteries and if there is insufficient capacity in the battery this can cause the problem.
You do not actually say the exact circumstances of the two warn lights coming on and if they go out.
The traction control warn is telling you that there is insufficient pressure to guarantee operation.
Ciao,
Adrian
Switzerland.

Thanks you for the post.
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