i'm used to it when I drive my car because I have been driven car with this problem for over 3 months. But, I sometimes feel dangerous when I need to stop suddenly.
I'm going to check my brake system on coming Monday.
I'll update soon.

 

Hi, everyone. I went to Porsche Dealership and one of the mechanics drove my car. He said that it might be problem about ABS pump. But, it sounds like not sure about the problem. Brand new ABS is cost about $3,600 just for parts.
I don't wanna spend much money for car. And then, I found 2nd hand ABS at DC Automotive. it costs about $300(much cheaper), but Im just worry about fixing brake problem even if I buy and replace the ABS...

Do you guys have any suggestion??

 

If you don't know brakes inside and out, especially ones with ABS, find someone who does. I don't know of any repair shop that will install used parts, especially brake parts due to the liability issues. If you find an indy porsche shop see if one of the mechanics moonlites.

 

If it feels soft after all that, you probably need new pads or the system needs to be re-bled.

 

pull the fuse for the ABS module and see if the pedal pressure feels better.