markmac

Rebuilding 90 C4 brakes and having trouble with bleeding the left front.
Not getting any pressure to caliper.

Brake pedal very difficult to depress.

Dalesc4

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.

Brake pedal very difficult to depress.[/QUOTE]

C409

......... 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 ........

Tom400CFI

Break it down to see where the issue is.

markmac

Have traced back to ABS and nothing found.
No pressure at chassis side of rubber line.

Not sure which line at abs is for this brake.

Tom400CFI

I don't know....I'd try to identify the line from the master to the ABS module, crack it at the module and see if you have pressure/flow there.

Cliff Harris

There is no rubber line in the brake system. You are probably looking at the coupling hose for the fuel tank to vapor canister line.

markmac

Actually, there are four rubber hoses in the brake system, one at each wheel. They run from the caliper to the chassis

But thanks anyway.