Who's Responsible?

[Burnerman]

I have to say, 13k a year is usually enough to keep things sweet, although the rear brakes don't do a great deal - which is why the pads should last for ages.
'One pad' probably means a one axle set of pads, i.e 4 pads.
I still think you have a sticking caliper!
John

 

[Stivino]

In July last year, I fitted new discs and pads to my Avensis.
I used the car for a about six weeks then, I went to Tenerife. I stayed in Tenerife until the start of October. I go to Tenerife regularly and stay for a month or two so I am familiar with what happens with my brakes on my return. i.e. at least one pad will be stuck to a disc. So, the first time I use the car on my return, I know to just ease the car backwards until I hear the clunk.
However, when I returned at the start of October, I had the new discs and pads on and I was curious as to whether something would be stuck.
On trying to reverse out of the drive, sure enough there was a clunk to let me know it had happened with the new parts. too.
On driving down the road, the grating noise was a wee bit louder than usual but, it soon cleared.
After a few days, I noticed a ring round the centre of the right disc. Curiosity got the better of me so, I removed the pads to find what you see in the picture.
The pad had stuck to the disc so well that, when I moved the car, part of the pad came away.
I went back to the motor factor who supplied it and, they were adamant that I had got a stone stuck in there. Reluctantly, they gave me a new set of pads but were adamant that it was a goodwill gesture and that they bore no responsibility.
However, they were unable to explain to me how a stone measuring anything between 5mm and 10mm could get into a gap measuring less that 0.1mm.
I didn't tell them that the car had been laid up for six weeks as I wanted to hear their explanation.

View attachment 181790

 

[Burnerman]

I'd say that was a typical pad made by the Ying Tong Disc Pad company......from their finest quality Weetabix
John

 

[Stivino]

I'd say that was a typical pad made by the Ying Tong Disc Pad company......from their finest quality Weetabix
John

Both the pads and discs were from Juratek. I've used them in the past and had nothing but good results.
I think you'll find that for the past 20 years or so, like everything else, the majority of brake discs have been manufactured in China.
It doesn't matter what brand you buy or, what marque it is for, there is a strong possibility that your new discs, or whatever else you buy, will originate in China.
Edit; In Tenerife we have a Seat Leon 1.9D 2010. I had to put discs and pads on it in November. It has 5 spoke alloys. Guess what is stamped on one of the spokes inside the wheel. MADE IN CHINA. I'm quite sure wheels won't be the only thing that the VW/audi group source in that country.

 

[bolo 2]

I still think you have a sticking caliper!

Sorry John but the caliper was examined by the senior technician and found to be in perfect working order. Nevertheless, over the next few months I’ll be keeping an eye on the new disc. Got the 50% reduction on labour and manager is to contact head office to see if they will bend further on the cost. Didn’t get an answer to why wear is on the offside only, but intend to take that further.

 

[Burnerman]

Ok, many thanks indeed for the update!
Interesting that no comment on the excess wear was forthcoming......!
It is possible, but extremely rare, that a faulty master cylinder or even an ABS fault could cause this but I sincerely doubt it.
Please keep us informed, if you remember.
Cheers
John

 

[bolo 2]

Please keep us informed, if you remember.
Cheers
John

Will do. Meanwhile, many thanks for your input.

 

[baldykev]

HI
Check that the handbrake releases correct. Jack the rear up apply handbrake then release it and check that the wheel can revolve same resistance on both sides do about 5 times.
Linkages from cable to calliper can seize up causing brakes to hang on.

 

[Burnerman]

Good post Kev but this one will have the disc/drum system. As far as I know all of the Kia Hyundai group use this.....not sure about the i10 though.
John

 

[baldykev]

Spot on John, just looked it up . I thought the hyundai i20 was the only model that did not have that set for some reason(old age)

 

[bolo 2]

Back sooner that expected. Looking at Stivino’s disc photo above, should the disc on the i20 be shining bright all over like his is. Have just driven around 200 miles and I can see that near the centre of the disc there is a band of metal around 12-24mm that is not as bright as the outer ring.

 

[Burnerman]

Ideally, yes.....this shows that the disc pad has worn to exactly the same profile as the disc, so all the rust and crap gets scraped off.
Often, the outside of the disc can look good, but the hidden side is in a horrible mess!
John

 

[Burnerman]

Allow me to try to qualify my last statement.......
Stivinos picture is of a new and unused front disc brake, and in real life it won’t look like that for long!
As discs are made from sintered grey iron, you have to expect spots in them which may be a little harder than others......the higher the chromium content, the more resistance to rusting and hard spots.
The inner face of the disc is more prone to dampness due to the reduced air blast to dry them.
John

 

[Stivino]

The above picture (previous picture in above post) is of a new disc going on the car.
Here is the old and new for comparison.

 

[Burnerman]

For sure, Ive seen discs in much worse state than that......interesting to see the back side though!
I use a hammer to break off the rust rim on the outside of the disc when I’m checking them, and blow the dust out of the vents with compressed air.
John