Whats wrong with my Fu***ng brakes (fixed)
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  1. #1
    dek
    Rods 'n' Sods Junkie dek's Avatar
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    Whats wrong with my Fu***ng brakes (fixed)

    single circuit system , master cylinder, drums on all four corners, no servo

    pump pedal and its fine press it again five seconds later , nada straight to the floor , bled all four corners, same result

    binned the master cylnder for a new one , bled all again plenty fluid through all corners no air bubbles, same result,


    any clues seems like its air but its been bled fine upteen times, with zero bubbles in the fluid

    help , its driving me mad
    Last edited by dek; Yesterday at 13:13.

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  3. #2
    highly experienced bodger draguar's Avatar
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    Did you bench bleed the master cylinder?


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  4. #3
    dek
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    nope

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  6. #4
    Off the Xmas card list kapri's Avatar
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    Under the floor m/c ? Original source of m/c ? Has it always been like this ( could be undersize ) ?

  7. #5
    dek
    Rods 'n' Sods Junkie dek's Avatar
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    yes m8 under floor, car been on road 20 yeas , no built by me , has a hyster forklift master on it ,same as one thats been on it for years

  8. #6
    highly experienced bodger draguar's Avatar
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    I had loads of issues with mine till I took it off and bench bleed it first you put blanks in the port where the pipe comes out of, mine come with plastic ones, grip it in a vice then fill will brake fluid and pump the cylinder with w wooden dow or something similar and keep pumping till no air comes out into the reservoir and it gets impossible to move the cylinder any more, then refit and bleed as normal

    Also make sure all your drums are adjusted correctly and the wheel cylinders are not weeping but I would presume you have already done that


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  10. #7
    Off the Xmas card list kapri's Avatar
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    In that case it sounds like bench bleeding is the way to go . Obviously I'm assuming it has been ok in your ownership up to now ? Then as it's underfloor I'd vacuum bleed it rather than pressure or trad method manually.

    With an all drum set up I'd expect the m/c to have internal anti bleed back valving to prevent the strong drum brake springs returning all the fluid .

    I don't know if that is standard on the forklift cylinder ? Otherwise I'd be fitting adional residual pressure valves inline.

  11. #8
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    got a flexi hose swelling under pressure or a cracked drum
    at least dick turpin had the decency to wear a mask!

  12. #9
    Care in the Community WagonMan's Avatar
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    I would say it needs residual valves to stop the fluid being pushed back from the cylinders, if it has these fitted then the m/c could possibly need bench bleeding.

  13. #10
    Official RnS Addict mygasser's Avatar
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    all the above and....... get a pump up garden weed sprayer. fill with brake fluid and 'back' bleed 'in' through the bleed nipples to push the air back out though the master cylinder. it's messy but has always worked for me on stuff that just won't bleed whatever else i try.
    neil.
    need a job done on your project? i may be able to help.

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