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Audi s8 brake pad warning light

Discussion in 'Motors' started by Bounce, 29 Jul 2021.

  1. Bounce

    Wise Guy

    Joined: 22 Dec 2011

    Posts: 1,790

    Location: Stoke-on-Trent

    Had some new discs and pads fitted to the front on an Audi s8, the brake pad warning light on the dash won’t go out , but the pads are fine.

    Any ideas what the problem might be?
     
  2. Kenai

    Capodecina

    Joined: 5 Apr 2009

    Posts: 22,061

    The new pads either don't have the sensor wires, the sensor wires haven't been connected or the sensor wires are damaged, those are the mostly likely reasons.

    (I don't think they'll have pad sensors on the rear but if they do, maybe it was those that triggered the light)
     
  3. Nasher

    Capodecina

    Joined: 22 Nov 2006

    Posts: 21,830

    Try clearing errors with an OBD2 reader and torque, see if it comes back.

    Most aftermarket pads won't have a sensor though. If that's what was used.
     
    Last edited: 29 Jul 2021
  4. Yaayuh!

    Capodecina

    Joined: 5 Nov 2010

    Posts: 21,863

    When you say you "had them fitted", I assume you got a garage to do the work? If so, I'd query it with them, especially if it was Audi.
     
  5. IAmATeaf

    Soldato

    Joined: 3 Apr 2007

    Posts: 7,221

    Location: South of the Watford Gap!

    On my BMW once the sensor trips it has to be replaced and then resetting isn’t straight forward, the garage, non BMW couldn’t do it and I had to google to find out how.
     
  6. dLockers

    Sgarrista

    Joined: 21 Jan 2010

    Posts: 8,318

    Sorting the sensor wires out is part of the job. Take it back.
     
  7. m4rmite

    Hitman

    Joined: 26 Oct 2007

    Posts: 706

    Carly for BMW app can reset the brake pad setting, i'm sure Carly do a VAG app as well.
     
  8. BUDFORCE

    Mobster

    Joined: 3 May 2012

    Posts: 4,098

    Modern cars........

    Out of interest would you fail an MOT for that light being on?

    A sensor to tell you if your brakes are worn is rediculous and completely unnecessary, just ******* look at them every now and then.

    Just like most other completely useless ****, erm I mean "technology" they put on cars that then goes wrong even though there is nothing wrong.
     
  9. m4rmite

    Hitman

    Joined: 26 Oct 2007

    Posts: 706

    Yes, i had new shocks fitted to a car, unknown to me the brake wears ensor cable had been snagged and cut on 1 corner.
    I reset my brake service distance in the dashboard as it showed as a service was coming up for time duration but the pads were fine, my mot was in 2 days and now i had a warning light.
    I took it for the mot and it failed
    Brake pad wear sensor illuminated comes under category 1.1.12(a)(i)- came under Major.

    Back i took it for a new cable/sensor to be fitted and hey presto, mot passed upon returning.


    edit: from the gov website

    1.1.13 Brake linings and pads
    Information will be added to clarify how to identify when a brake pad needs to be replaced.

    New or changed defects
    Defect Category
    a (i). Brake lining or pad worn down to wear indicator Major


    https://www.gov.uk/government/publi...anges-from-13-september-2018#section-1-brakes
     
  10. dLockers

    Sgarrista

    Joined: 21 Jan 2010

    Posts: 8,318

    Yes

    That is a stupid thing to say. Without a moderate understanding of cars even if you did measure them you'd have to "convert" it to time/mileage.

    :confused:
     
  11. silverblack

    Wise Guy

    Joined: 8 Jun 2007

    Posts: 1,675

    Had the same problem,light came on so replaced the front pads and connected up the new sensor.
    Light stayed on in the dash.Turned out it was the rear pads that needed changed ...doh :cry:
     
  12. Django x2

    Capodecina

    Joined: 28 Sep 2008

    Posts: 13,763

    Location: Britain

    If it's like any BMW from 2000 onwards (probably before), it's a staged resistor, one per axle. First stage triggered gives indicative mileage in iDrive. 2nd stage triggered, brake pad warning light. Replacing the sensor at the same time as the pads is required, then clear the fault with any of the million OBDII devices. I had/have BMTechnic cables and software, but I think he died and basically the software was never kept up to date. I also have VCDS, Carista and OBDEleven, all of which are useful for resetting these sorts of things, provided the work has been carried out to replace the pads and sensor.
     
  13. Nasher

    Capodecina

    Joined: 22 Nov 2006

    Posts: 21,830

    Sensors for everything now. Sometimes with the sensors costing more than the part they are sensoring. But the sensors can also fail and either make false errors or just not tell you something is wrong :/

    Brakes already have a much more reliable, built in warning when they are low. They have a physical wear indicator on them which makes them sqeal badly.
     
    Last edited: 30 Jul 2021