Not sure about cost, but if you buy all new parts, it;ll be more. As a very rough estimate, $150 for 2 brake calipers, $150 for 2 brake carriers, $150 for 2 rotors. I could be way off on the prices, but a +1 size to the corrado brakes is already about $500 and you need 15" wheels minimum. A +2 sized brake adds a master cylinder and the misc parts are a little more expensive, so you are looking at maybe $700.
It depends. A jetta would also benefit from a rear conversion to disc brakes.
I always tell people to try brake pads first, the hawk hps are pretty decent. You'd be surprise how much softer brake pads and rotors would increase braking force. They make more dust though, OEM brake pads are generally less dusty, but stop worse. More stopping power normally means more dust, sorry!
CCBB, has anyone tried a brake cylinder brace? I've never seen one for the VW.
Sorry for posting an incomplete link, after I posted it I realized that it needed some big improvements. It's now fixed and greatly updated.
There are a few articles floating around that need fixing and are in rough drafts.
The brakes are worth the money IMO. Front brakes will last a long time, but if you are replacing the pads, rotors, and your car has high miles, it's not much trouble to replace the carriers and calipers with larger units.
As for stopping power, each step is a big improvement. Keep in mind that you need at least 15" wheels and your tires need to be able to handle the extra stopping force. My car doesn't have ABS either, but I think it was an option on some jettas.
I have included quite a few aftermarket and OEM bolt on kits. I'm sure there are a lot more options but they would require customization. All the kits listed on the page are direct bolt on or bolt on with a 5 lug conversion.
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