You do not need have to flush out every 2 years, it is just a recommendation.

But brake fluid is hygroscopic in that it will absorb moisture (via the breather hole in the reservoir) over time, the more time the more moisture. Now moisture has 2 bad effects in the brake system, it will encourage corrosion - pistons and cylinders which will be a problem in the medium to long terms. But right now that wee bit of moisture could prove to be a killer - you see if you are using the system hard and system temperatures rise (as they do!!) that moisture turns to vapour which means you foot will go flat to the floor and in the worst case you (and others ) may end up totalled. The hydraulic principle relies on the near incompressibility of liquids once you have vapor then it will compress rather than move pistons and pads.

Your choice at the end of the day. It is a relatively straight forward procedure to do yourself. The guys your side of the pond favour a power bleeder. A search on this forum should turn it up.

NormanB

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NormanB
230 TE (W124) 1989 with 153,000 miles on the clock - hoping for at least another 100K