[Steve Tinker]

First off, it begs the question why you have been driving round (for 3 months) with the brake warning light on? Porsche went to great lengths to protect the expensive rotors from damage by worn out pads by fitting the light.

1) Because you have an S model, the rotors are cross drilled and that means that skimming / resurfacing them is verboten. Minimum thicknes is 26mm (front) and 22mm (rear) - anything less and they will need replacing. Not a big job, but will be expensive if a shop does it with their full markup.

2) Because the brake wear indicator is lit, you will need to replace the sacrificial cable(s) which has been worn down - there are 2 per rotor. You will need to identify which one(s) are worn through. Some people just short them out to get rid of the warning light but then you don't have any early warning system.....

3) Red light (I assume temp indicator for coolant) can mean many things - is it flashing, is it steady, is it still illuminated what did the guage indicate? Have you checked the level of the coolant lately?

4) A rattle from the suspension can be the drop links - but you need the jack the car up and inspect.