ABS code one long 8 short , short on dump valve how do I find the short on 1991 Chevrolet G Series Van (G30)

I had to by pass valve cause no fluid went to rear brakes

by in Wake Island, HI on March 10, 2013
1 answer 1 comment
ANSWER by on March 11, 2013
there is no code 18 in all data, seek diag and est to determine issue
COMMENT by on March 14, 2013
I counted the flashes when I did a self diagnostic, it was 1 long flash followed by 8 short flashes, on the internet it said it was a shorted dump valve

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