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You can use DOT "3and4" or DOT 4. You should be able to find it at any parts store. Don't use DOT 5, ever. It's not designed for the VW. A quick google showed this:




DOT 3 brake fluids are mixtures of glycols and glycol ethers. DOT 4 contains borate esters in addition to what is contained in DOT 3. DOT 5 is silicone chemistry

DOT 4 glycol based fluid has a higher boiling point (446F) than DOT 3 (401F), and both fluids will exhibit a reduced boiling point as water content increases. DOT 5 in its pure state offers a higher boiling point (500F) however if water got into the system, and a big globule found its way into a caliper, the water would start to boil at 212F causing a vapor lock condition [possible brake failure].
 
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