I have a 2003 Audi A4 and the power steering fluid is low....

What brand and where can i buy one to replace it?

 

You have to buy hydraulic oil (green one).
You can buy it anywhere.
If the engine is cold oil level should be fill it out to the maximum.

 

Pentosin CHF11S is what you need for your PS fluid. NAPA stocks it, but it's pricey. Expect to pay around $40 for 1 Litre.

 

I got some through auto parts way canada (online). About 23 bucks a litre.

But you only get free shipping on orders over $75, so if you only need a little it might be cheaper to go local.

DO NOT add any other kind, these systems are touchy.

 

Been using the generic red stuff in my system for 1.5 years already. Never had problem yet. Think it cost somewhere in the neighbourhood of $2 a liter.