Hey

 

I had a quick search and while it answered some questions I'm a bit of an idiot when it comes to mechanical things and as only been driving for 2 years and have no mates or family any good with this stuff I'm a bit lost.

 

I had an advisory from the MOT that the rear brake discs would need to be replaced soon due to corrosion at over £200 for them and pads, the same garage had fitted new standard spec discs literally 8 months or so earlier at a full inspection service and so my question would be how are they corroding so fast. I don't have a garage but I use my car on decent distance drives almost daily where the brakes are used pretty well due to slightly harsher driving. Living in NE Scotland isn't going to help but nothing else seems to be rotting away and the front discs are fine.

 

Another question I have is I am not sure which brakes I have and so am unsure what pads to order for the fronts, the garage I use is 50 miles away so not really appropriate for a quick pop in to get them checked lol, is there an easy way for an idiot with no tools to find this info out? As I would like to put better pads on like I did with the better bulbs because the standard stuff this garage is putting on seems to be hopeless. They are a Skoda approved place and the car is serviced when advised, I probably do 20k a year on average and had the car since DEC 2018.

Rear discs get lots of road muck thrown at them.  Since you live in the frozen NE (fit lik...?) that means a lot of salt in the winter and therefore a fair bit of corrosion.  

 

As for pads, if you do a search on eBay, that'll give you a range of options for pads that fit.  

I had already searched that was the issue but I don't use Ebay, It says there are 3 different fitments for my Yeti so I need to know which one I need before I buy

No way would rear discs be showing that amount of corrosion after only 8 months.

 

Its probably a line that they add to all the service bills in an attempt to rob people, they probably forgot that they had taken you so recently.

 

I dont doubt that the 2015 discs would have needed changing, mine is a 2015 and had spent its life in Scotland, the rear discs were in a right two and eight and I changed them at the end of last year, I have done 8000 miles since and with the confinements there has been a lot of non use which would allow corrosion to proliferate, they still look like new.

 

Have you actually looked through your wheels at the discs? Did you check that they were actually changed last time?

Edited 20 November, 20205 yr by J.R.

Does the Yeti have a load sensing valve that reduces rear brake force to avoid rear brakes locking under light load. As a 4x4 brakes are not tested on a rolling road but with an accelerometer sensor on a test drive, if the load sensing valve was faulty the rear brakes may not be working fully, hence the rusting.

At present we only have the garages standard line of text as witness that they new brake discs are significantly corroded, just like the old "brake pads & discs 75% worn".

 

The rears dont do much work at the best of times, pretty sure with the ABS and all the other 3 letter acronyms operating through  it that 70's technology like a load sensing valve would not make a good companion!!

 

11 minutes ago, J.R. said:

The rears dont do much work at the best of times, pretty sure with the ABS and all the other 3 letter acronyms operating through  it that 70's technology like a load sensing valve would not make a good companion!!

My departed Forester had two seized rear brake caliper pistons a coupe of years ago.... 

I was advised to change rear discs at 2 year service and about 30k miles.

I declined and the car still passed it’s mot a year later.

If the brakes work effectively and the discs are not down to minimum thickness or excessively scored that is ok.

I'm in agreement.  It passed the MOT so the brakes must've been good enough.  I'd just keep an eye on the rear disks until the corrosion is significant.  One thing though you said they were new disks, were they OEM disks from Skoda or unbranded disks made from Chinesium.  I've had aftermarket disks on cars in the past and they corroded/warped faster than OEM.  Now I get them replaced with either OEM or aftermarket depending on how much longer I'm planning to keep the car.

 

Fully agree with the MOT advisories being a bit of a revenue earner for the garage.  I once went to Kwick Fit for an MOT out of desperation because it was open on Sunday and, due to an error on my part noting my diary, the MOT was up on Monday!  The list of advisories was impressive, since Kwick fit staff have sales quotas to get bonuses.  I knew their game though and politely declined all the "repairs" for the advisories.  They included tyres, brake pads, brake disks, and exhaust, plus a few other bits and pieces.  That car was traded in about 5 yrs and around 90k later and still with the exhaust on it that had been given an advisory by their MOT examiner, and that the fitter, or should I say salesman, confidently assured me would be lucky to last a few months...

Cheers for the replies, I'll have a look at all the paper work and double check things when I have a spare moment. Just to reiterate, as they are a skoda approved place I'd assume they used bog standard oem VW discs whatever they might be,  I didn't fully inspect the discs fully but I did eyeball them as new when I checked the car

In terms of shady things, they are a well respected and almost universally praised service centre and actually stopped me from spending extra when I booked the wrong thing in, doesn't mean they are above changing things before they need it. They never tried to force the change, just said they were corroded and what it would cost to sort it out

No material known to man could corrode faster than what is used on the VAG OE discs & backplates, they will have spent decades refining it.

 

I had my wheels off yesterday (change to winter wheels) & my Chineseum discs were just fine, same vehicle, same age, discs changed at similar mileage and time ago.

On 23/11/2020 at 18:59, J.R. said:

No material known to man could corrode faster than what is used on the VAG OE discs & backplates, they will have spent decades refining it.

 

I had my wheels off yesterday (change to winter wheels) & my Chineseum discs were just fine, same vehicle, same age, discs changed at similar mileage and time ago.

The backplates are a joke. You can get aftermarket zinc coated backplates on autodoc... shame the steel ones with a light misting of satin black got signed off by skoda R&D.

1 minute ago, Shaunieboy said:

The backplates are a joke. You can get aftermarket zinc coated backplates on autodoc... shame the steel ones with a light misting of satin black got signed off by skoda R&D.

 

Same goes for Subaru