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Help needed !! EPB - do I need a new calliper ?

Rob2k68 Oct 18, 2016

  1. JulianW

    JulianW Registered User

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    Rob, this is probably a bit "locking the gate after the horse has bolted", but there is a painless and VCDS-free way of changing rear pads without putting yourself through all this grief. This method first appeared in the A5OC forum a little while ago. Here's the link: http://www.a5oc.com/forums/a5-s5-topics/23988-rear-brake-job-without.html
    I hope this is useful.
     
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  3. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    I think for quickness I'll replace it then later on buy a seal service kit and repair it thoroughly - difficult to manage the school runs when down to one car so hope to be back up and running tomorrow with any luck.
     
  4. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    Cheers for that - might try it on the other side ;o)
     
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  5. SJC

    SJC Registered User

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  6. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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  7. davc

    davc Registered User

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    This approach is not advisable as it can blow the EPB module from what I've been told.

    VCDS or a similar tool should always be used.
     
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  8. S3 Turbo

    S3 Turbo Registered User

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    Blow an ECU?!

    Like an error code only resetable by Audi??
     
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  9. JulianW

    JulianW Registered User

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    Not entirely sure how one would go about blowing the EPB module, as the EPB motor is physically out of the circuit and the car is switched off for the procedure described. Unless there is some kind of pad thickness calibration going on with the 8V A3/S3, which definitely would require VCDS intervention. However, I note that no such calibration is required for A4/S4, A5/S5, A6 or Q5 - all the models where this method has been used with success.
     
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  10. davc

    davc Registered User

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    The EPB module not the ECU mate. It has happened before using the method described although it is not known if the wiring was disconnected from the motor itself. I'll ask my mate as it was a guy he knows who blew the module (he didn't have a diagnostic tool when doing the job).

    You're right, think it's only the A8 that has the pad thickness calibration.
     
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  11. JulianW

    JulianW Registered User

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    10 quid says the wiring was still connected.
    As far as I'm aware (and, to be frank, that's a pretty limited awareness, so happy to be corrected), the whole EPB system is an isolated circuit that simply applies and releases the brake, and the module itself is little more than an actuator for the EPB motor. So, no risk of the process doing anything to the ECU, S3 - the two components simply don't talk to each other.
    That said, running voltage through the EPB module while messing about with the motor would be a sure-fire way to fry the poor little ******.
     
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  13. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    New caliper fitted just need to bleed it now ....
    IMG_1287.JPG
     
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  14. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    So curiosity got the better of me ... what did I do wrong ?? Only way to find out .... do the other side which I did in half hour. This time I put the battery charger on and left the laptop connected, what the issue was though is winding the caliper in enough whilst in 'friction pad replacement mode'.

    With my EBC pads I needed the caliper to be open by 55mm. I wound the caliper back in using 1 in the pic below (turn clockwise for both LH and RH calipers) but that only made the gap 50mm which is where I was last time when I stupidly cycled the VCDS lining change mode. What was needed was a couple of turns on 2 below in order to push the piston in the extra 5mm. Once you know the little ins and outs it's a straight forward job really ......

    IMG_1291.JPG

    By the way you need a T45 torx to remove the rear calipers. Torque is 35Nm.
     
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  15. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    By the way really impressed with the Yellowstuff pads LoL !!
     
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  16. steverobertsbbc

    steverobertsbbc Registered User

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    I'm not surprised! They're the most expensive pads you'll ever buy. :p
     
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  17. davc

    davc Registered User

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    Glad you're sorted now Rob.

    Cheers for the tips on where you went wrong:sunglasses:
     
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  18. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    Thanks Dave ;o)
     
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  19. pburv

    pburv Registered User

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    Buy yourself a pint or two you deserve it......:yum:
    [​IMG]
     
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  20. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    Oooo yeah pint of anything would do nicely now mate :friends:
     
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  21. JulianW

    JulianW Registered User

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    Glad it's all sorted, Rob. A pint or two is well-earned! And all this will definitely go in my tips and tricks file for future reference.
     
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  22. Sv2k

    Sv2k Registered User

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    This is an old thread, but I have exact same problem. Once the new caliper is installed with fully retracted piston and EBP, what has to be done in VCDS/OBD11 to get the system back to normal and in sync. Right now, my other caliper is engaged and the system is not letting me do much because of the error codes. Is the manual workaround needed here? thx
     

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