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A4 B8 rear brake pads, how too?

tedward Aug 27, 2013

  1. tedward

    tedward Member

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    The rear pads need doing on my 58 plate A4 but the pesky electric handbrake is making it look nigh on impossible for a d.i.y,er .

    Can anyone recommend a link to a how too without using the plug in caliper re-set gizmo or am i going to have to stump up at a garage?

    There is a gunsons re set tool on e bay which might be worth a go?
    Gunson Electronic Park Brake Reset Tool | eBay

    thanks.
     
  2. Daggerit

    Daggerit Well-Known Member Team Floret Silver TFSI Owners Group Team V6 Audi S4 quattro Audi Avant Owner Group

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    Look for someone near you with a VCDS. As far as I'm aware this is the only way of retracting the caliper to allow for a pad change unfortunately...
     
  3. NHN

    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    You not considered buying vcds for both your cars, then its money gone towards a single tool to do many jobs :)
     
  4. dieseldoos

    dieseldoos Active Member VCDS Map User

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    You can do it without VCDS allthough its better if you have it.

    If your confident you can use use a 12v car battery to retract the pistons.


    The electromechanical parking brake is a 12-volt motor that engages and retracts the rear brakes.

    To retract the rear wheel parking brake, you will need access to a 12-volt battery and two jumper wires. One of the jumper wires should have an insulated clip on the end so you do not short-circuit the wires.
    When you are looking at the caliper you will see the brake line and electric wire/connector going to the rear caliper.
    Disconnect the electric connector from the caliper. Inside the connector on the caliper side you will see two medal pins sticking up. Connect the two jumper wires to the 12 volt battery.
    Take the negative wire jumper and connect it to one of the pins on the caliper. Then take the positive wire and touch the other pin without touching the other jumper wire and causing a short.
    If the caliper piston starts to push out, stop!, reverse the jumper wires. You should hear the parking brake retract and the piston not move.
    Continue until the caliper piston starts to spin, stop! Now push the caliper piston back in with a brake tool, c-clamp, etc. Replace pads as you would normally. After all the brakes have been replaced. Pump brake pedal until you have a firm pedal. Check the brake fluid. Then turn on and off the electromechanical parking brake a few times and you should be good to go. Very simple!
     
    Chop., jerrygttdi, DrSasso and 2 others like this.
  5. tedward

    tedward Member

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    Now that's what I'm talking about, there's always a way! Spare battery in the garage and plenty of wire about, pads ordered.....sorted.

    Some local jockey wanted to charge me £50 to connect the laptop to rewind the pistons and £47 to fit the pads?..no thanks.
     
  6. Zafi

    Zafi Well-Known Member

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    Just bumping this as someone was asking about how to do it. Thanks for the battery tip, dieseldoos
     
  7. JG51 AUD

    JG51 AUD Well-Known Member Team Glacier TFSI Owners Group Team V6 Gold Supporter Audi S5 quattro Black Edition Supercharged

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    New I had read this somewhere, top work dieseldoos. :thumbs up:
     
    jerrygttdi likes this.
  8. Fwings

    Fwings New Member

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    Hi Just changed my discs and pads for EBC with green stuff pads un plug the plugs on the calipers and connect a 12v battery to the pins the hand brake will wind back all the way until the piston starts to spin push the piston back assemble pump the brakes use the hand brake ....job done no labour cost at all and no computer
     
  9. audimaniac312

    audimaniac312 New Member

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    This is the cheapest only tool that will get it retracted besides that vag com. It’s a scanner made by autel. You click on the EPB setting pick euorpean, vw , special functions, then deactivate brake, it will rewind the brake piston, turn ignition off. Then you change the brakes as normal. When finished go back to the scanner, same thing and this time activate the brakes instead of deactivate on the scanner. The 12 volt method can cause damage to the ecm http://amzn.to/2x6eHdJ
     
  10. desertstorm

    desertstorm Moderator Staff Member Moderator VCDS Map User quattro Audi A4 Audi Avant Owner Group TDi

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    It is possible to damage the caliper using a battery. The module that drives the motor on the caliper provides a 12V current limited feed to the motor. You can actually monitor the amount of current that the caliper motor is drawing.
    This is how the module knows the position of the motor. As the brake pad contacts the disc and starts applying pressure the motor takes more current to the point where it nearly stalls.
    The module will cut the power off before the motor stalls to avoid damage to the mechanism and the motor itself.
    Driving the motor off a 12V battery you have no current limiter, especially if the battery is a large 12v car item.
    Using a small capacity 12v battery such as a 12V SLA alarm battery around 2.3A would reduce the chances of any issues as the peak current available from a smaller battery is a lot less.

    http://pmmonline.co.uk/technical/how-electric-parking-brakes-epb-work-part-3-service-and-diagnosis/
     
  11. xpoweruk

    xpoweruk S4 B8 Smile Machine Team Ibis Audi S4 quattro saloon

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    Have you thought about Carista ? Has some coding functionality
     
  12. forty3

    forty3 Active Member

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    Carista has an option for operating the handbrake and I'll be using it tomorrow so hopefully it works!
     
    xpoweruk likes this.
  13. jakm15

    jakm15 New Member

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    The motor is held on to the calliper with 2 torx bolts.

    Remove the two torx bolts then the electric motor will separate off the calliper, you then will be able to see a torx gear that the motor engages into. Wind this clockwise until it stops, you can then fully depress the calliper piston with a g clamp or similar.

    Refit the electric motor, fit the new pads, re fit the calliper, wheel back on.

    Job done.

    There are several videos on YouTube as a how to.
     
  14. ianv5

    ianv5 Active Member TeamMisano Team V6 Audi S4 quattro Audi Avant Owner Group

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    I used carista, nice and easy.
     
  15. Liber_A4_te

    Liber_A4_te New Member

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    Carrista all the way. Get a cheap Obd2 scanner, download carrista, use it to retract the handbrake. You will need to subscribe but it's only £7 for the week. Easiest start way if you don't have VAGCOM

    Sent from my F8331 using Tapatalk
     

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