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    F-800 Lucas Girling Brakes

    I've searched a lot. I just assume that there wasn't that much pressure with it just being held by a hose clamp. Here are pictures of the schematics. The hydraulic relay is the only thing possible i can think of now but the fluid is flowing through it because it pumps off the brakes and also...
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    F-800 Lucas Girling Brakes

    I have a 1989 F-800 with the Lucas Girling brake system. The line that comes out of the hydromax into the Hydraulic relay is building up too much pressure I believe. I put a new line on it that was rated at 315 PSI and it started to bubble out of the side like it was about to blow. I then went...
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