Accord brake conversion

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Junior Member
I changed my rear brakes to discs but the proportionating valve i was givin said 3540, which was from ca3 4 wheel disc ABS. the old one was 3030 disc /drum, 4040 is from 4wheel disc non ABS.
what do these numbers mean ????? :huh:
That's the part number that's stamped on the middle of the proportioning valve body.

For reference:

3030 = stock valve from my Civic DX with rear drums
4040 = stock valve from 94-01 Integra non-ABS

I don't know what 3540 is.