Brake system warning light - hyd pump or bomb?

[SJ]

I was looking up the part numbers for the bomb.
The 88 5kq uses  857 612 061C
The 90 100q uses  443 612 061H

Whats the difference between the two  bombs?

SJ
85 Dodge PU, D-250, 318, auto 
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q




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