Be a waste of money and you won't achieve anything as the new fluid will just absorb any moisture from the old stuff and you won't change very much as the brake fluid doesn't flow as such and you will still have the old stuff in the lines, you need to change the fluid by bleeding, in the correct manner so the system is flushed, not only fluid is changed but any particles get flushed out as well.... Just sucking a bit of fluid from the reservoir won't get the crud laying down amongst the valves as OLMATE said.
If you are unfamiliar with the process just get a brake shop to do it, not a local spanner shop, care does need to be taken as getting air in the system can stuff up the ABS unit ..............
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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