Why did the UMW guys only focusing on wheel alignment? If the all those test results showing within spec, but your vehicle still pulling to one side, IMHO, it's the steering rack that is faulty.

Since you'd been to so many tyre shops, had any of them ever checked the steering rack?

what abt the steering rack pre-assembled as senget?

This is a very weird and rare case indeed 

So was any qualified mechanics/technicians/foremen other than the ones from UMW able to rectify the cause of this problem? What did they recommend you to repair/replace?

your wheel chamber senget ? lol , i drive old toyota , good condition still can drift one lol

seriously??!

japanese brand local made car wor..?
mayb less than 30% got problem like this

must be occured during certain shift hour by certain supervisor at the factory..

im driving avanza oso n it really can go straight even after alignment n balancing

but i din go to toyota service centre coz i noe they bs kaw kaw    ... so i let my mechanic check n he say its normal for avanza n in fact most mpv oso got slightly this problem cause by their turning radius .... solution add two bolts n nuts cost rm45 each wala kau tim liao no problem

y hafta go tribunal n make thing so complicated when rm90 can solve d??   juz go tell everyone enuf lo

is UMW that horrible?

but ppl buying proton already expecting problem so expectation were not that high .

but toyoto, even assembled by umw, how come toyota allow their image to be damaged like this... lol

mr chow... i worry, cos i just bought my vios from UMW tmn midah sommore.. sigh... i don't want to service there already.... any place to recommend?

wahh so many problem with umw...defect cars oso can give customer and in the end blame customer...post mr chow hp everywhere make him busy ...hehe

The Avanza is assemble in Malaysia I think that's why suck so bad lol

SUE TOYOTA also no use i guess, big companies are big shark they just have to rasuah then settle everything liow.
If u bought a lemon car, then its really unlucky i think last resort is totalled it and claim insurance buy new one but in the process = u lose some $$ as the premium.

And To be honest, Car companies should be more responsible of consumers car, to buy a damn Honda civic Type R in UK/US is just 1/3 the price in Malaysia and we get this kind of shitty services.

goodwill is very important, i suggest the owner of the avanza make a headline in news paper to Chinese papers usually they write whatever gossip in it.
This will create an image impact on the company.

atleast to warn the future people who going to buy a car be more careful.
if i can afford i think will buy a European car. although there is cases where defect car leads to lost of lives, that's just luck i guess.

well cannot put newspaper then put on blogs famous blogger, in fact internet now days is a large media source for most people. I cant live without internet

lms, saw the videos. 

I'm pretty sure this is a caster problem like my pm to you.

My KIA Sportage 2000 has the exact problem of pulling to the left even though the alignment is perfectly straight.

http://en.wikipedia.org/wiki/Caster_angle
http://www.ozebiz.com.au/racetech/theory/align.html

It's not a huge problem, and if you don't fix it I suppose one can live with it.

Some front wheels can be adjusted for caster, and some can't, I dunno why.

Anther reason told be me by veteran mechanics, left side wheels and right side wheels have different wheelbase (center to center distance between wheels).  In your case, since it is pulling to the left, then the left wheelbase is shorter than the right wheelbase.  The difference is not possible to be spotted by the naked eye, so I think it's best that the wheelbase be measured accurately, and also the the caster can also be measured.

Boring of hearing those boleh minded....

Proton problem = Proton suxs
Toyota problem = Fault of those Toyota staff...

Its your luck...

TS... Did they adjust camber... camber may make your car pull a side too... Some more what tyre r u using? Tyres also may make your car pull a side too... Hope this info can solve your problem...