The 410 has a balance bar to mechanically adjust the proportion of effort applied to each master cylinder. I assume this will be the case with your system.
If you have a 4.25:1 servo for the rear brakes it will need less pressure, so more can be applied to the front. As the manufacturer fitted with 2 x 4.5:1 and that gave a very good feel, I will replace with as near to original as I can.
Once you have one servo removed it shouldn't be too much of a chore to do the second at the same time.
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