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brake pads/ servo

  • 08-04-2009 1:50pm
    #1
    cantdecide
    Registered Users, Registered Users 2 Posts: 11,465 ✭✭✭✭


    Picked up our 04 Ducato from the menders after getting new front pads.

    First of all, imagine switching the engine off and pumping the pedal until it hardens up. Imagine keeping your foot on the pedal and then switching the engine back on- the servo engages and the pedal goes to the floor.

    I noticed the brakes weren't 100% effective and took the van round the block to see how soft the brakes actually were. I wasn't happy with it so started experimenting. If you pump the brakes a couple of times when it's driving, the pedal hardens up and refuses to push down like the engine is off but if you keep your foot on the pedal, it slowly goes down as if the servo is engaging but slowly.

    I rang the guy and he said it's normal but I'm not very confident. I've had new pads in cars before and aside from having to plan your braking, there was no other effects. If I sat in and drove it not knowing it had new pads, I would think the servo was acting up and not engaging properly...


Comments

  • #2
    biko
    Registered Users, Registered Users 2 Posts: 81,220 ✭✭✭✭biko


    Guessing here but it could be the fluid? Was that changed?


  • #3
    Darragh29
    Closed Accounts Posts: 7,097 ✭✭✭Darragh29


    Only two likely issues here OP:

    (1) Air in hydraulic brake circuit. This is unlikely as when doing brake pads, air should not be getting into the circuit in the first place just by changing the pads, unless the caliper has been changed as well, which doesn't seem to have happened in your case.

    (2) This can also happen if you have brake discs that are badly worn and should have been replaced with the brake pads. What happens is the discs have a big lip on them that stop the pad surface from coming into contact with the disc surface and prevents proper braking from occuring. I'd start by checking this first as you should be able to see this immediately by looking in through the wheel or worst case scenario, removing the wheel.

    Have a look at the attached pic, this is what you are looking for, the inner and outer lip running around the disc...

    EDIT: The behaviour you are seeing with the pedal going down further when the engine is turned on, and the servo starting to work, this is normal, you should see this on any car...


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