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servo problems

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  • 04-10-2008 9:01am
    #1
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭


    breaks are failing on my Hiace van.

    the warning light comes on and the breaks go solid at the pedal. With no breaking power.

    pulled the vacuum hose to the servo and there seems to be plenty of suck.


    no cracks in the hose.


    it only happens when the engine is cold.

    what should I be looking for??


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  • Options
    #2
    Captain Slow IRL
    Registered Users Posts: 3,651 ✭✭✭Captain Slow IRL


    Probably a hole/split in the diaphragm.

    Try and get a listen at the servo, see if you can hear a sucking.

    Was there any work done on the servo/master cylinder recently?

    EDIT - Can you get someone to check the vacuum at the pipe when the engine is cold and hot? Could possibly be defect with vacuum pump.


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    #3
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    Captain Slow IRL wrote: »
    Probably a hole/split in the diaphragm.

    Try and get a listen at the servo, see if you can hear a sucking.

    Was there any work done on the servo/master cylinder recently?

    EDIT - Can you get someone to check the vacuum at the pipe when the engine is cold and hot? Could possibly be defect with vacuum pump.

    seems to suck when cold. breaks where always very sharp on the van . felt a bit wooden. Like on hard with no in between.

    once the van has traveled a few miles the problem disappears. And it does not always happen when cold. half the time its fine.

    There is a cylindrical box that the hose from the engine goes into and from there there is a pipe to the servo. What would that be?

    there is sucking noises from the area but the airbox is in that area also. Its not really possible to know what sound is what.


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    #4
    Captain Slow IRL
    Registered Users Posts: 3,651 ✭✭✭Captain Slow IRL


    The cylindrical box is probably your vacuum pump - if it's losing contact with whatever's driving it or the pump is losing pressure, it would cause what you're describing. Strange that it's intermittent, I'd have thought it'd just go!

    When you experience the problem, get out and see if there is a vacuum at the pipe. If there is, it's probably a fault with the servo; if not, it's your pump or pipe-work.

    One of the toyota experts might be able to advise you better, but you're probably best to bring it to a commercial mechanic or main dealer.


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    #5
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    Is there any point serviceing a brake servo.

    or is it easyer just to buy one from the brakers


  • Options
    #6
    Captain Slow IRL
    Registered Users Posts: 3,651 ✭✭✭Captain Slow IRL


    No, if the diaphragm's torn it's got to be replaced.

    Price a new one as well, it might'nt be as dear as you think.


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  • Options
    #7
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    got it sorted. My fan belt was loose and worn.

    battery was dead this morn which was odd as I charged the 2 batterys last week.
    The belt was slipping and was not making any odd sounds.

    The vacuum pump runs on the same belt.

    I bought a second hand servo on ebay . waste of money. My servo is fine


  • Options
    #8
    Captain Slow IRL
    Registered Users Posts: 3,651 ✭✭✭Captain Slow IRL


    Ya live and learn!

    Back onto ebay with the servo, you might be able to recoup most of the cost.


  • Options
    #9
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    Captain Slow IRL wrote: »
    Ya live and learn!

    Back onto ebay with the servo, you might be able to recoup most of the cost.

    aye. should have replaced the belt 2 years ago . should have copped on to it.

    got a mechanic to check it and was advised to get the servo.

    we live and learn.



    Any one need a cheap servo. :p


  • Options
    #10
    mickdw
    Registered Users Posts: 23,260 ✭✭✭✭mickdw


    gsxr1 wrote: »


    Any one need a cheap servo. :p

    Are you selling them 'wii things' aswell boss?


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