I can't say I have heard of anyone doing this. Fortunately, I do not think that brake fluid will have an immediate damaging effect on the seals as would be the case if you did it the other way (power steering fluid into the brake system). While the lubricity of brake fluid is less than the fluid the system was designed for, it is unlikely that a short drive will cause serious damage (pump rather than box would be the likely damage). If properly flushed and refilled, I think it is likely that you will get away with it.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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