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Rear discs worn out before the front ones? (Tiguan 2021)

  • 30-07-2025 11:20AM
    #1
    Registered Users, Registered Users 2 Posts: 144 ✭✭


    I had to replace the rear brake discs because their were below the minimum thickness.
    I would have expected to have to replace the front one firs, or is this expected on recents cars?
    I have stability control, ACC and auto-hold activated but I have to say I am not an aggressive or sporty driver :)



«1

Comments

  • Registered Users, Registered Users 2 Posts: 41 blanchwill


    How old is the car? Were the front discs already replaced by a previous owner?

    Also what is the make and model?



  • Registered Users, Registered Users 2 Posts: 9,898 ✭✭✭User1998


    2021 Tiguan in the thread title is a bit of a giveaway… I sure hope the title was edited after you commented😂



  • Registered Users, Registered Users 2 Posts: 810 ✭✭✭rustynutz


    The same thing happened with my Seat Ateca, which is based on the Tiguan platform I think. I remember thinking it was odd at the time too



  • Registered Users, Registered Users 2 Posts: 8,911 ✭✭✭BrianD3


    Rear disc brakes have the complication of a handbrake mechanism and may not get enough footbrake usage or heat to dry and clean themselves. Electric handbrakes may also stick. It's been my experience (not on VW) that rear disc brakes require more maintenance than fronts. I've had pads wear out more quickly on the rear and have also had issues with brakes rusting, a seized manual handbrake cable due to water ingress and a delaminated pad on the rear. Meanwhile, my front discs and pads were fine for 325k kms.

    For normal everyday cars, rear drum brakes are what you want, the handbrake mechanism is also much simpler for drums.



  • Registered Users, Registered Users 2 Posts: 41 blanchwill




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  • Registered Users, Registered Users 2 Posts: 1,702 ✭✭✭kermitpwee


    I heard it's down to the Abs system, more braking in the back



  • Moderators, Business & Finance Moderators Posts: 18,015 Mod ✭✭✭✭Henry Ford III


    Doubt it. The front brakes do most of the work as the engine etc. is out front.



  • Moderators, Category Moderators, Arts Moderators, Sports Moderators, Paid Member Posts: 53,799 CMod ✭✭✭✭magicbastarder


    how many km on them?



  • Registered Users, Registered Users 2 Posts: 3,311 ✭✭✭Dr_Colossus


    No idea but sounds unusual and as per above how many km on them. Wonder could manufacturers of these modern cars be cheaping out even further putting thinner/lighter grade disks on the rears given they're expected to preform less work.

    My old Volvo S60 has disc brakes all round but the mechanical handbrake is a separate drum brake running inside the disc. Given the smaller diameter the handbrake performance isn't great but it'll hold the car on any incline and has been trouble free for years despite doing low mileage and often left up for a week or two at a time. Pretty good design overall.



  • Registered Users, Registered Users 2, Paid Member Posts: 14,794 ✭✭✭✭ednwireland


    i think modern discs particularly vw are soft. our 131 tiguan seems to through them (and suspension components in general)

    my mk2 octavia needed them as well

    are they softer for better braking ?

    my 88 corolla and 98 nissan primera never needed any discs (rear drums so didnt need them there 😉 )

    My weather

    https://www.ecowitt.net/home/share?authorize=96CT1F



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  • Moderators, Category Moderators, Arts Moderators, Sports Moderators, Paid Member Posts: 53,799 CMod ✭✭✭✭magicbastarder


    How many km on the Octavia when you replaced them?

    I'm currently at 160k and (AFAIK!) they're fine. Car was through service and NCT a couple of months ago with no mention.



  • Registered Users, Registered Users 2, Paid Member Posts: 14,794 ✭✭✭✭ednwireland


    can't remember, garage did them when I bought the car haf over 160000km at the point, then had to get a rear one cos a of a sticking caliper, then two front ones after about 50000km my memory might not be perfect on that one. it was 2 cars ago ! heavy front end on the 1.9tdi.

    My weather

    https://www.ecowitt.net/home/share?authorize=96CT1F



  • Registered Users, Registered Users 2 Posts: 8,911 ✭✭✭BrianD3


    Some of the disc change recommendations are going to be dealers upselling/gouging. VW group and especially Audi are known for this, someone has to pay for the glass palace showrooms and this work is routine and piss easy for a mechanic. Also, unlike oil changes, brake jobs won't stop being a revenue stream for them if all customers switch to EVs.



  • Registered Users, Registered Users 2 Posts: 9,898 ✭✭✭User1998


    Actually they will. There’s no need to replace discs & pads if regenerative braking is used for the majority of the time. Plenty of Tesla’s in the States with 200k miles on their original brakes or second set of pads only



  • Registered Users, Registered Users 2 Posts: 8,911 ✭✭✭BrianD3


    They won't. As long as cars have discs and pads, dealers will try to convince customers that they need changing. Even more so when they don't have a steady revenue stream from oil changes. There's often no need to replace the brakes on an ICE either yet dealers still recommend it and people fall for it.

    Also, regen braking and lack of use means that brakes may rust more. More rusting = more scoring = discs looking bad and more customers convinced that they need changing. And quite possibly more NCT fails on insufficient contact between disc and pad.

    PS I got 325k kms out of the original front discs and pads on my diesel car. That's 200k miles and it wasn't motorway only driving. The replacement set has 270k kms and has plenty of life left in them. I got a lot less out of the rears though - probably due to lack of use.



  • Registered Users, Registered Users 2 Posts: 9,898 ✭✭✭User1998


    If you let a main dealer convince you that your brakes need changing when in reality they don’t well then that is on you but the fact of the matter is that the use of regenerative braking does reduce friction brake wear and thus makes the brakes last a lot longer



  • Registered Users, Registered Users 2 Posts: 8,911 ✭✭✭BrianD3


    The fact is that most people know very little about cars but know that brakes are important. They are wide open to being manipulated by dealers and this is exactly what happens. It's not "on them" FFS.

    As I said, regen braking = more brake rust but regardless of whether EVs need more or less brake maintenance, unnecessary brake jobs will become a bigger part of the motor trade's gouging arsenal as they look to replace lost revenue from no more oil changes. Brake jobs, rotating the tyres, cabin filter replacements, plugging in the computer and (as flagged by the CCPC this year) suggesting to customers that their warranty will be void if they don't get this work done at a main dealer.



  • Moderators, Science, Health & Environment Moderators Posts: 20,474 Mod ✭✭✭✭Sam Russell


    Aren't rear brakes smaller than front ones because they do less work?



  • Moderators, Category Moderators, Arts Moderators, Sports Moderators, Paid Member Posts: 53,799 CMod ✭✭✭✭magicbastarder


    I know with cycling there's the saying that the back brake is for slowing down and the front is for stopping - largely because of the weight transfer forward as you decelerate. Wouldn't be as pronounced in a car due to the much longer wheelbase, but definitely still a factor.



  • Registered Users, Registered Users 2 Posts: 15,276 ✭✭✭✭Flinty997




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  • Registered Users, Registered Users 2 Posts: 558 ✭✭✭Dirty Nails


    Are you possibly mixing up pads & discs? Rear pads often have less lining thickness.



  • Registered Users, Registered Users 2 Posts: 1,006 ✭✭✭noelf


    My 20l8 Golf also had to have the rear brakes replaced before the front the reason I was given is the electric handbrake doesn't release quick enough ..



  • Registered Users, Registered Users 2 Posts: 1,702 ✭✭✭kermitpwee


    No actually I am correct, the abs system is used for grip and cornering in the Vag group, this is why the rear brakes wear out quicker than the front. The abs system is kicking in without illuminating the dash👍



  • Registered Users, Registered Users 2 Posts: 558 ✭✭✭Dirty Nails


    Sorry,but no actually,you're far from correct. Firstly its ESP/ESC not ABS. Totally different thing. ESP may apply an individual brake in pulses to correct a skid or loss of traction but not in normal driving. Will use ABS wheel senors for readings. Nothing to do with front/ rear brake pressure split either, anything more than 30/40% brake force to rear would be the equivalent of pulling a handbrake turn.



  • Registered Users, Registered Users 2, Paid Member Posts: 6,521 ✭✭✭DaveyDave


    I believe that's for those with the electronic differential, XDS, such as the GTI (the GTI Performance Pack has a mechanical diff). I don't think it's on standard model cars. Open to correction though.

    The replacement of rear pads before front pads is likely from using ACC as it uses the rear pads for small adjustments to speed. The rear pads were replaced on my Golf around 65,000km I believe and I used ACC religiously.

    Post edited by DaveyDave on


  • Moderators, Business & Finance Moderators Posts: 18,015 Mod ✭✭✭✭Henry Ford III


    Nah. Abs works on all 4 wheels. Front discs are bigger simply because they need to be. Weight shifts forwards under braking



  • Registered Users, Registered Users 2 Posts: 15,276 ✭✭✭✭Flinty997


    No idea why you quoted Kermit in that.

    It would seem from the web that early rear disc wear is common in modern cars due to a variety of systems using the brakes, auto hold, stability, cornering systems and abs. It pops up on other manufacturers too. Driving style has an impact. You can always get a faulty batch of my pads to or discs.

    Probably worse on something sporty, heavy or driven hard.



  • Registered Users, Registered Users 2 Posts: 7,555 ✭✭✭JoeA3


    The above is correct. Rear discs wear quicker on a lot of modern cars due to the proliferation of safety tech - the ESP is constantly kicking in without you knowing, the electronic handbrake and even adaptive cruise control or fancy "travel assist" systems when motorway driving.



  • Registered Users, Registered Users 2 Posts: 15,276 ✭✭✭✭Flinty997


    In assume smoother you drive, less breaking, less accelerating and a lighter left foot. All helps



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  • Registered Users, Registered Users 2 Posts: 8,911 ✭✭✭BrianD3


    Maybe ESC and ACC are factors but I've never had those and on my last two cars the rear brakes have needed replacing before the fronts.



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