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[Vivaro] Brake pedal problem

Discussion in 'Movano and Vivaro Commercial Vehicles owners forum' started by Joe W Richardson, Mar 21, 2012.

  1. Joe W Richardson

    Joe W Richardson New Member

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    I found an old thread on this but it did not reach a conclusion so I will start it anew.

    The van failed the MOT because the brake pedal when pressed puts on the brakes but then moves all the way down to the bottom of the travel. When the engine is not running it locks up solid no matter how hard the pedal is pressed which indicates the general hydraulic circuit is OK. There are comments made that 'they all do this' however not with just hand pressure. My thoughts are that it could be the ABS system as this appears to have a pump that when running must bleed off the excess pressure and therefore maybe also allowing the system pressure to leak off slowly. On the road it is not noticable and the brakes are very powerful having had new discs and pads all round.

    OK any real info out there on this.....

    Regards Joe
  2. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

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  3. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

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    also if you have just had new discs and pads fitted and pads not run in the surfaces will soft a which will make the problem worse, 500 miles will harden them up but dont over heat them.

    could the seals have been flipped in the ABS pump when the pistons were pushed back into the caliper, best to release the bleed nipple to stop this,
  4. davecplym

    davecplym Active Member

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    Oh no - this brings back horrific memories!
    I had this problem on mine. Nickymadd is right, you do get diesel creep but mine had it to excess. It was just stubborn air in the system which I eventually got rid of by manual bleeding (someone on the pedal and someone opening and closing the bleed nipple with a spanner).
    I found that it went on for so long I became confused about what was normal and had to get a mate to help as an independent pair of eyes.
    Good luck!
    Dave
  5. Joe W Richardson

    Joe W Richardson New Member

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    Thanks for the above but air does not seem to be the problem and as stated brake solid without engine running but creep with engine running and hand pressure on the pedal which I would say cannot be considered excessive. All calipers returned with pedal raised which allows fluid to return directly to the cylinder without undue system pressure .

    Joe
  6. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

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    it will be fluid passing in the abs pump, as said in the link if the pedal creeps dont push it so hard and if pedal still creeps when engine off and vacuum exausted then you do have a problem, just a guess here but if your moving and you press the pedal it will stay hard and at the top its just when you are standing still that this happens, got to remember it has a big servo unit on it because it has a lot of weight to stop because it is a van, have read links where people have changed the master cylinder then the abs unit and no change.

    harden the pads would be a first thing and perhaps print the link to take to the testing centre.

    copyed off link.

    The phenomenon is known as diesel creep; and it is
    often incorrectly diagnosed as being caused by a faulty master cylinder.
    The solution is to stop applying the excessive pressure.
  7. nickymadd63

    nickymadd63 VxON Club Member VxON Club Member

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    why not try some other diesel vehicle brakes and see how there brake pedal responds
  8. Joe W Richardson

    Joe W Richardson New Member

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    Think a visit to the local Van dealer is called for and perhaps test drive a few....

    Joe
  9. rick45

    rick45 Well-Known Member

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    Location:
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    i have had this on a hgv were applying the brakes going down steep hills did nothing sometimes, mech's could find no faults, so thought one weekend i would take master cyl off and found a hairline split in the seal, new brake valve sorted the job out, i then did not need to buy new underpants every week,
    but this was on air brakes not fluid a bit of a shitter when you can't stop 100 tonne.

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