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Barry R

Corroded rear brake discs

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Any suggestions please ! I have had my Golf R for 2 years now and my annual mileage is about 4000 miles.The car is 4 years old and the total mileage is  just over 28000 miles.On a recent MOT at my local main dealer I was advised that the rear discs were corroded and brake pads were 50% worn. This was pointed out to me not as an advisory on the MOT.The reason l was given for this corrosion is that I am a “light braker” as opposed to a driver who slams the brakes on all the time.I was advised that at the next service internal in 2 months the discs and pads would need changing at a cost of £420.00. Is it too late to correct this corrosion and if not how could this be corrected ?

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The rears corrode like crazy on the R mostly down to modern pads being harder than disc material and the way the ECU on the R uses the rear brakes to help balance the car. There are many tales on here of the rears causing MOT failures at first MOT and low milage.

 

As it happens mine is in today having a full set of discs and pads fitted F&R and it's done 16,000 miles in just over 3 years. Inner face of fronts was corroded so pad was only contacting 1/3 of the disc and the rears are scored all the way around. Service prior to MOT advised fronts are checked soon and maybe replaced while the rears were not mentioned but looked awful so decided to do both. I've gone for MTEC C hook discs with black anti corrosion coating, after seeing other forum users recommend them, and EBC red pads as it's only road use and not track. Full set delivered was less than you have been quoted for rears and I have a local garage that I've used for 20+ years fitting them for less than £100.

 

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Corroded discs due to too light brake applications means imho perhaps you should not have purchased a performance car! 

 

Corroded discs are always a sign of lack of use- 28k miles and rear pads only 50% worn????

 

I am an 'enthusiastic' driver and after 26k my rear discs are fine.

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Mine has been stealer serviced yesterday and I got a warning about the rear discs being scored ! pads 50% worn and my fronts only 20% worn after 29k,

pathetic springs to mind my A45 brakes lasted way more before ay issues, suffice to say VW will not be replacing mine I'm going to find an alternative decent local VW specialist

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1 hour ago, Andygo said:

Corroded discs due to too light brake applications means imho perhaps you should not have purchased a performance car! 

 

Corroded discs are always a sign of lack of use- 28k miles and rear pads only 50% worn????

 

I am an 'enthusiastic' driver and after 26k my rear discs are fine.

 

The light braking excuse from the dealer sounds like bull to me the rear discs scoring and causing MOT failure has been well documented on this forum. 

You can also find this issue on Golf GTI forums, Skoda VRS forums, Audi TT forums, Audi S3 forums, Cupra forum. All VW forums have similar issues with rear brakes and you will find several tales of discs and pads replaced at 12 months old at the owners expense because brakes are a consumable. I've also seen the same on a BMW forum and the replacement cost was aprox £1k after 12 months so it's not an exclusive VW issue but very well known in VW groups.

The fronts have less of a corrosion problem on the front face but many are hiding issues on the rear until MOT time but so long as your brakes work at 50% of max rate it will pass an MOT. I don't think cheap sliding brake calipers on a performance car help either because previous cars with Brembo and Alcon 4 pots had zero issues with corrosion on disc faces.

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It could just be the mot station/stealer trying to up sell and they believe if they mention brakes and make out they are worse than they are to people then it will scare them into spending and getting them done as it’s all about safety at the end of the day. 

 

I say they believe this will prompt people to spend but what I mean is it does actually make people spend as it is about safety so people get worried and believe what they are told by the “experts”. 

 

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8 minutes ago, Scotty2hotty said:

It could just be the mot station/stealer trying to up sell and they believe if they mention brakes and make out they are worse than they are to people then it will scare them into spending and getting them done as it’s all about safety at the end of the day. 

 

I say they believe this will prompt people to spend but what I mean is it does actually make people spend as it is about safety so people get worried and believe what they are told by the “experts”. 

 

 

This. Scored discs are not a reason for MOT failure unless *subjectively* the tester feels braking performance has been compromised. For garages that offer repairs that has got to be tempting.... ;)

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My wife 'inherited' a golf estate from her company whilst waiting for a new car. Rear discs had the outer 30% of the friction surface covered in rust/

 

The VW garage refused to swap them as they said it wasn't a problem.

 

My point was that as around 50% of the swept braking surface wasn't being used due to rust, then the rear braking performance must be compromised. If that was acceptable, why didn't VW spec the cars with smaller rear brakes.

 

 

 

I gave up in the end as it wasn't a long term car and I had, technically, nothing to do with it.

 

You do wonder about VW garages turning business away, especially a safety issue...

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7 hours ago, Andygo said:

My wife 'inherited' a golf estate from her company whilst waiting for a new car. Rear discs had the outer 30% of the friction surface covered in rust/

 

The VW garage refused to swap them as they said it wasn't a problem.

 

My point was that as around 50% of the swept braking surface wasn't being used due to rust, then the rear braking performance must be compromised. If that was acceptable, why didn't VW spec the cars with smaller rear brakes.

 

I gave up in the end as it wasn't a long term car and I had, technically, nothing to do with it.

 

You do wonder about VW garages turning business away, especially a safety issue...

 

Maybe it was on a fixed price maintenance contract, so it saved them money by refusing to do it.

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