Change brake pads, brake oil.. what else to do on the brakes.. no upgrade

1. proton sp3 ori cost around 20 bucks per liter. you need around 4.5 liter or so.
2. proton original wiper arm cost around 70 bucks. labour cost not included.
3. skimming x4 disc cost around 120 bucks. not advisable to skim more than twice.

rough ride could be caused by a worn out lower arm bushes / spring and hardened absorber.
worn out arm bushes gives a boat like ride. absorber link does not contribute much to bad ride. but it may affect
the handling and also, causing a squeaking noise.

what tyres u r on especially the front ones?

tyres/tires plays a big role on cars roughness and comfortableness, it maybe brand new but the tyres pattern, compound affects the ride. like what yngwie said, the other old, wear out parts also affects. maybe its time to consider autofoam the chassis. sorry i cant help diagnose leh, as i also had brake caliper pin problem if u have read through my post, its solved and reduced the level of roughness too.   

brewoe_1988@
as i suggested earlier, you may need to pool your budget and change em at once to cut on alignment cost.
start with the front parts replacement.
here is a rough estimation ;
sachs / monroe absorber  around 250 bucks for both
new lower arm with bushes around 200 for both front (good quality)
absorber link around 100 for both (good quality)
absorber mounting (if your old ones is already worn out) around 100 bucks for both front
labour cost roughfly around 100 bucks.
alignment / balancing maybe cost around 68 or so.

total damage(estimate) = around 850 or so with hidden cost on rubber cover / protector.
but after a rear suspension / arb bushes change, you car will feel like new!
in my case, it was even better than a new car 

estimate price according to market price sometime early of this year.
if you want to change front and rear altogether, it will cost around 2k or so.
and you will only saved about 38 bucks or so on re-alignment cost.

here is an estimate breakdown for the rear ;
2x2 = 4pcs suspension link( short and long) - 100 bucks x2 = 200
rear absorber x rubber protector - 180x2 = 360
rear suspension arm - 1xx bucks x 2 = 2xx
rear arb linkage x 2 - 65x2 = 130

labour around 150 bucks or so.

and since you're working on suspension changes, why not change the arb bushes
in a go? check with elton for a good arb pu bushes for more 'responsive handling feel.

i don't know which area you're staying, how could i recommend a workshop?
200 bucks is an estimate price for both side. its not an original proton but will last for another 5 years or so.
good thing you get rid of the noisy sound when driving over those thick yellow lines.
i don't suggest changing the bushes alone on old lower arm. those worn out arm bearing can't be swapped.
new proton ori cost in the region of 2xx bucks for a pair. not sure if there is a different between abs and non-abs thou.

you can buy the gen2 type rear arm link l/s from any spare part for 200 bucks x4.
and the front lower arm comes with bushes. you don't need to buy separately. unsure about cost but i can give
you my friend's contact number in kl if you are interested to deal.
btw, pesc usually charge higher.

try on this, it might help.
http://forum.lowyat.net/index.php?showtopic=1300861&hl=