power brake assist issue - Page 2
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  1. #11
    24v
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    Also when you say bolt to the bulkhead,
    Pedal pushing the master cylinder and aided by the remote servo?
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  3. #12
    Official RnS Addict brading's Avatar
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    Would you need a reservoir on a brake system a electric vacuum pump. Can understand for wipers as you exhaust the vacuum constantly.

  4. #13
    24v
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    Just in case I’m thinking but could be wrong.
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  6. #14
    Off the Xmas card list kapri's Avatar
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    Quote Originally Posted by brading View Post
    Would you need a reservoir on a brake system a electric vacuum pump. Can understand for wipers as you exhaust the vacuum constantly.
    Nope , you shoudn't NEED one on brakes but depends how quickly you exhaust vacuum supply by rapid braking . Electric motor shuts off at max vac as well.

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  8. #15
    24v
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    Ok great thanks.
    Just measured the pedal.
    It’s under floor mounted.
    From the bottom point to pedal is about 14 inches
    The pivot point to bottom point is about 2 inches.
    Is that 7:1?
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  9. #16
    24v
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    Just got the bore size off the master cylinder also
    It’s 1 3/8
    So I think my ratio is too high maybe?
    From doing some digging this morning it should be 4:1. - 5:1 for assisted pedals ?
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    Off the Xmas card list kapri's Avatar
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    Too high a ratio pedal would give a long pedal travel as the pad will move more than the m/c.

    1 3/8 is HUGE. Do you know bore sizes of calipers / rear slaves?

    I'm not sure what's F1 and whats not , can you confirm?

  11. #18
    24v
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    It’s completely Isuzu npr with matching m/c and larger dia drums off an nqr.
    So m/c matches front twin piston Calipers but might be under powered for the back. But is locking one rear wheel.
    I think I might bite the bullet and convert to vacuum using the electric pump and a remote servo.
    But do I need 2 remote servo as I’ve 2 outputs from the m/c?
    Last edited by 24v; 05-07-2020 at 12:53.
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  12. #19
    24v
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    Would this have the max vacuum cut out already
    If so install and wire,
    Then vacuum hose to booster ?
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  13. #20
    Off the Xmas card list kapri's Avatar
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    If the m/c is correct to the vehicle it can only really be something on the plumbing on the Hyrdoboost.

    Yes, you'd need twin remote servos or you can buy a remote servo which i stwo back to back in a single (big ) unit. Not cheap though at around £400.

    Vac motor is set to max cut out from factory and is wire and fit to servo(s) .

    It's going to work out pretty dear to fix a system that should be fine ?? Got to be in your plumbing or boost pressure . You can by valve sthat regulate power steering pumps down to match to different racks for not a vaste amount of money. I think Speedway in the states do them and their are agente over here .

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