MCS uneven brake pad wear.

[Pongobongo]

Hi,

After my brake pads started rubbing this week, I decided to investigate.

Looking through the alloys, I can see that both front and rear pads are worn uneven (pad worn away at an angle). There's still plenty of life in them, although the rears do not make full contact with the disk. So much so, the disk surface that is not in contact with the pad has corroded. (probably a ring of 10-15 mm around outside of disk)

Is this normal?

Thanks

[Cooper S Jon]

i've got the ring of corrosion on my rears also..

what do you mean wearing at an angle..

[Pongobongo]

Quote: Originally Posted by Cooper S Jon (original)

i've got the ring of corrosion on my rears also..

what do you mean wearing at an angle..

The pads have not worn flat e.g smaller at one side to the other. 5mm difference. As if the caliper is pushing all the pads off centre. Hmmmm

[Tabintab]

I have seen many a mini with corroded rear disks. Its not normal for any car & it will affect the braking performance, though with most cars only about 1/3 of your braking effect is done at the rear.

I got my rear disks, pads and wear sensor replaced under waranty as the car was only 24 months old at the time.

Tab

Quote: Originally Posted by Pongobongo (original)

Hi,

After my brake pads started rubbing this week, I decided to investigate.

Looking through the alloys, I can see that both front and rear pads are worn uneven (pad worn away at an angle). There's still plenty of life in them, although the rears do not make full contact with the disk. So much so, the disk surface that is not in contact with the pad has corroded. (probably a ring of 10-15 mm around outside of disk)

Is this normal?

Thanks

[Pongobongo]

Well was a tad worried about this until I visited my local mini dealer today. Luckily they're closed Sunday so had a good nose!

Anyway of all the cars I looked at mini2 s's, ones and d's, all appeared to have the ring of corrosion on the rear (20 cars or so) It looks as tho the whole of the rear disk is not being used when breaking - correct me if I'm wrong.

The uneven pad wear was also seen on these cars. Have a look through your alloys - youll see what I mean. Shocked when I first noticed this. Must be a mini thing!!

Feeling a little better as I've seen it on other models - thought my calipers had gone big time.

[Tabintab]

Most car brakes corrode when not in use & come in contact with moisture. When you get circumferential rings of corrosion after being driven then that is the area not in contact with the pad and is of concern.

I have only noticed this problem with mini's. Looks like not enough corrosion inhibiting metals like zinc, nickel in the alloy.


Tab

Quote: Originally Posted by Pongobongo (original)

Well was a tad worried about this until I visited my local mini dealer today. Luckily they're closed Sunday so had a good nose!

Anyway of all the cars I looked at mini2 s's, ones and d's, all appeared to have the ring of corrosion on the rear (20 cars or so) It looks as tho the whole of the rear disk is not being used when breaking - correct me if I'm wrong.

The uneven pad wear was also seen on these cars. Have a look through your alloys - youll see what I mean. Shocked when I first noticed this. Must be a mini thing!!

Feeling a little better as I've seen it on other models - thought my calipers had gone big time.

[Pongobongo]

Quote: Originally Posted by Tabintab (original)

Most car brakes corrode when not in use & come in contact with moisture. When you get circumferential rings of corrosion after being driven then that is the area not in contact with the pad and is of concern.

I have only noticed this problem with mini's. Looks like not enough corrosion inhibiting metals like zinc, nickel in the alloy.


Tab

To me it looks as though the rear pads don't cover the entire surface of the disk. E.g rear pads only brake on 90% of the disk.

The corrosion would surely be worn away when the brakes are applied if so.


Have you noticed the angle of pads?

[dsakko]

The pads never cover the full radius of the braking surface. On my R56 race car and many years back my R50 road car there was always 1mm ring on the very outer of the disc, and 1mm on the very inner radius of the disc that is not in contact with the pads.

How about a pic?

[dsakko]

Check out this (a great pic) - I reckon this is pretty normal. You can see a groove on the outer and inner sections where there is no contact with the pad. The rest is all wearing evenly.

http://r56mini.com/wp-content/upload...57600236_b.jpg

[Pongobongo]

Quote: Originally Posted by dsakko (original)

Check out this (a great pic) - I reckon this is pretty normal. You can see a groove on the outer and inner sections where there is no contact with the pad. The rest is all wearing evenly.

http://r56mini.com/wp-content/upload...57600236_b.jpg

Thanks for the pic.

Mines alot worse than that..... here we go.

MINI Galleries - Cooper - S - One - Diesel - Works - Cabrio - Brake Disk Corrosion

theres a few others i've uploaded too - check out the abnormal pad wear too. This is on both back wheels/disks.

You can see the part of the disk that has corroded - so I presume that the full disk is not in contact with the pad.

Just seen an 06 - no problems/corrosion whatsoever. The 07 s's I went to look at the other day all seem to have this disk problem. Very strange.

Let me know what you think

Ta

[Cooper S Jon]

you will need new discs & pads both sides asap

that disc wear is abnormal,going by the pic i'd say(guess) there is about 55-60% pad contact with the disc..

in my day as mechanic the term for that disc would be f****d(actually still is)

[Pongobongo]

Oh dear.

The car was bought from a garage 2 weeks ago. Full new MOT put on it, RAC safety check.

How much is this gonna cost me? Do you think I should approach the garage RAC?

Any advice is much appreciated.

Thanks

Dai

[dsakko]

It would be worth putting in writing to them so that they know they missed something important.
- this is a safety issue
- this is obvious
- they should have picked this up

Also, just replacing discs and pads might not fix the problem??? Would be worth getting someone who knows brakes to have a look to see if there is something screwy. Could be
- bent caliper mount?
- problems with the caliper itself
- poor installation of the last discs or pads (this one would be fixed with just pads/discs )

[Pongobongo]

Thanks for the replies both. Of course I'm massively concerned.

I'm a little confused by the other 's's' I've seen at my local official mini dealer. All of them display this corrosion/pad wear on the rears. Some a little more than mine. All on 2nd gen models.

Ok, message and photographs sent. We'll see what they say.

[Tabintab]

I have seen this a lot also, its not good.

Expect Mini to bull **** you about it not being a problem.



Tab

Quote: Originally Posted by Pongobongo (original)

Thanks for the replies both. Of course I'm massively concerned.

I'm a little confused by the other 's's' I've seen at my local official mini dealer. All of them display this corrosion/pad wear on the rears. Some a little more than mine. All on 2nd gen models.

Ok, message and photographs sent. We'll see what they say.