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I'm no expert on the c4 yet
But I did read a post last week about a simular issue was related to the abs unit
It's behind the drivers seat on my 88 not sure if yours is the same
Maybe look in the Search area and see if u can find any thing
I'm sure someone with more experience can help
Dale
YQUOTE=markmac;1590179784]Rebuilding 90 C4 brakes and having trouble with bleeding the left front.
Not getting any pressure to caliper.
......... Crack the fitting for the brake hose at the chassis end and see if you get fluid there ... the rubber liner can swell and prevent brake fluid from passing through the hose ... if the hose is bad , you might consider changing all four ... an upgrade to stainless steel braided hoses would be my recommendation ........
......... Crack the fitting for the brake hose at the chassis end and see if you get fluid there ... the rubber liner can swell and prevent brake fluid from passing through the hose ... if the hose is bad , you might consider changing all four ... an upgrade to stainless steel braided hoses would be my recommendation ........