My infiniti I35 stopped beeping when i lock the doors with the remote.

do you have your seat belt fastened ??

If you have CAS data .Read the CAS data directly, and matching the key and also you can chose
auto key tool to Unlock your car

As you have probably discovered, the diagram isn't included in the
Owner's Manual (http://www.downloadcarmanuals.com/1997-infiniti-i30-owners-manual-download) or even the service manual (Infiniti I30 and I35 Factory Service Manuals NICOclub).
It looks like the layout is the same as the Maxima from that era:



The 1998 layout is the same, although I'm not sure whether the actual lid/door will fit-
98 1998 Infiniti I30 Gray Fuse Block Cover Lid Door Panel Bezel OEM M88...

98 1998 Infiniti I30 Fuse Block Cover Lid Door Panel Bezel OEM 68964 eBay

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2004 INFINITI I35 subwoofer works some times and sometimes it just does not work at all.

solonoid is knackerd/jamed

Yes you can use Premium Unleaded Gasoline in your 2004 Infinity I35. Infinity actually recommends Premium grade gasoline for your car!

The procedure goes like this. First get in the car and lock all the doors. Secondly insert and remove the key repeatedly until the turn signal indicators on the dash flash twice simultaneously, it should be like seven or eight times. Then turn the key on and press the lock button on the remote and the lights should flash again. After that turn the key off and manually unlock and open the drivers door, then shut it. Wait a few seconds then try the remote. 

Doesn't sound like the brake lines were bled properly. Many times after pad and rotor installation if the lines are bled correctly you will have to pump them initially after the repair for a couple of minutes until the pressure is built back up. Also check the master cylinder and make sure fluid level is ok.

It is entirely possible that the unlock button on the remote is worn such that it is not making contact. I've seen this happen many times, as the unlock button is pressed so much more than lock. You might try to reprogram the remote first before you look into getting a new remote. The procedure goes like this. Close and lock all doors Key in and out of the ignition 6 times, hazard lights should flash twice Turn key into accessory or on position Unlock and lock doors with drivers switch Press lock or unlock on remote Hazards should flash again to verify recognition turn key off  manually unlock door and then open and shut it.  you should then be able to test remote. 
The key to the procedure is doing step two quickly Hope this helps, if not you may need another remote or see dealer.