Chevs of the 40s Community Forum

Pedal goes to floor

This topic contains 3 replies, has 4 voices, and was last updated by  Dale At Chevs 1 year, 7 months ago.

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  • #903

    Dale At Chevs
    Participant

    Please let me know if you are still having issues with the item that you bought from us. Thanks

    #901

    BIG ED
    Participant

    I TOO HAD THIS PROBLEM AFTER CHANGING THE WHEEL CYLINDERS AND MASTER CYLINDER TILL A FRIEND TOLD ME THAT WHEEL CYLINDER DID NOT AUTOMATICLY ADJUST, SO I ADJUSTED EACH WHEEL TILL THE BRAKES SLIGHTLY DRAGGED , I DISCONNECTED THE FURTHEST LINE FROM THE WHEEL CYLINDER TILL IT DRIPPED FLUID WICH TOOK CARE OF THE BLEEDING, TOPED OFF THE MASTER CYLINDER WITH FLUID AND THAT DID THE TRICK BRAKES WORK GREAT!

    #667

    eddie
    Participant

    Try removing the master cylinder and hone it to a good cross hatch pattern. Sounds like the bores on the new cylinders are too slick. Hook a gauge to the master cylinder. It should put out 1200 lbs pressure. You are not going to have good brakes if your MC does not put out at least 1000 lbs.

    #647

    tool462
    Participant

    I bought a new master cylinder for my ’46 pickup. bench bled it twice, installed it twice, have gone through plenty of new fluid through the system. I’m getting nothing but clean fluid at all four brakes with no air bubbles, but the pedal still won’t hold any pressure, goes all the way to floor. I’ve tried capping of the MC and I have a pedal when I do that so I know it’s not the MC. There is a 2psi valve and a 10psi valve for the front and rear line. Could those create this problem? The front lines at the calipers are steel braided, the only soft line is the one just above the rear end, and it seems fine.

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