Also probably your drumbrake will make noise, which is more of an annoyance than serious problem.

No spoil la.u guys being spoilt by continental car ady la. Its normal to have "gruk,grek" sound when release/engage brake pedal. It means your brake cylinder is pulling back the brake shoes, or the brake shoe is attaching the drum hub surface. You don't hear that often on other cars because most cars soundproof very well(GAGA not included) next time get the mechanic to open your brake hub, ask him blow dust, then u get to know how it works. It pushes the brake shoes out when u press the brake pedal, when u release, the brake cylinder will pull back the brake shoe, that's the "gruk,grek" sound you hear. What I worry is dares's "tak,tak,tak" sound. No reply from my magician yet, guess he oso dunno. Coz all cars he mod also disable ABS geh

The brake pad was soft initially, now its harden after a year. If it's within warranty, go komplen Plotong so they change you a new set. After sometime, it will come back again. Go back komplen again. Keep komplening until you finish your warranty. After that when you start forking out money from your pocket, then you'll decide to get use to the sound instead of changing brake pad every month All my drum brake cars rear brake pad can easily last 1.5 years to 2 years(include time to time go tauke at Genting) I'm not saying go back warranty is wrong, I just hope this doesn't bother you in the future(after the warranty), just get real and accept the fact that drum brake will have this problem.

Guess what, I'm currently driving a 16 years old ISWAGA also. Let me explain why you heard NOTHING from your ISWAGA drumbrake! Because your father's old school mechanic already tighten the brake bank range(if you notice you pull less handbrake to stop your ISWAGA compare to your FL). There is a series of gears at the opposite site of your drumbrake hub, to adjust the brake bank distance. To adjust the brake shoe closer to the brake hub can MINIMIZE such "grek/gruk" sound. How to check whether your drum shoe have enough free space... well...   sorry only olskool knowledge available(consider my age and driving/fixing/racing/fishing experience). Jack up your car, release your hand brake and spin your wheels with bear hand. If you feel no resistance besides of the tire weight, meaning your brake shoes are totally off the hub, your wheel will continue spinning for a very long time until the momentum gone. Normally an old school mechanic will adjust the brake until you spin it, only it move. If you take stop spinning, it will stop in a shortwhile, normally within 1 round cycle(2 round is GOOD, but seldom mechanic spend so much time to adjust until so accurate for you). Get what I mean so far?

Again, another olskol stuff to try out. Now, get your girlfriend(*can be anyone la, but will look embarrassing) to bring a mob, go to your rim and start poking the hub whilst you're INSIDE the car with all windows closed. You'll probably hear muffled metal pinging OUTSIDE the vehicle. But if you do the same thing to your BLM/FL/FLX, it felt like somebody is using a metal stick smashing your car!  So, I guess now you have pretty much idea on how tough ISWAGA is.

You may try to get somebody to slam your brake whilst you're outside at the backwheel listen to the drum beat, again I doubt you can hear much from your ISWAGA because the brakepad already lekat at the drum. So, I guess its very safe to said(if we're talking about the same sound created by the same stuff), the brake engage/release sound is very normal.

Hope this help

p/s: 1 more thing, you dont hear it much in the afternoon because the brake pad already heated up 

FL is softer thn FLX~! FLX stiffer~!