mk3 golf heater and braking woe`s

hi all, my daily is a mk3 1.4 with zero power and windey up windows… lovely! and all of a sudden the heaters have stopped working, they work a tiny bit if you`ve got it on 2, but if you turn it up to 4 to get some heat comin through the air is freezing cold by the time it hits your face, not fun in this weather at all. i`ve tried takin the heater hose off and filling it with water to bleed it but nothin changes. if anyones got any ideas i`d be gratefull for the help.

also its gettin time to change the brake discs an pads and i was wondering if its worth adorning the woefull callipers with uprated disc an pads to improve the braking a bit. or with brakes this naturally bad is it just not worth the extra cash.

any opinions welcome, thanks in advance, andy