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any mechanics out there? question about brake discs

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Found 5th Jan 2014
can anyone give me a rough idea of how quickly a cars brake discs can wear down? I had my service and mot done Friday and it was picked up that my discs had developed a lip round the edge, and were heavily corroded and scored. they said in that condition were dangerous and would fail the mot. got new ones straight on but when looking back at a health check I had done at the same place in august, the discs and pads showed no concerns. the car has only done 2000 miles since then. am I right in thinking that discs so badly worn would have showed damage at the health check? surely it would take more than 2000 miles for them to get into that bad condition?
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Did you see the old discs in question? Were they telling the truth?

Front or rear?

Does the car get used regularly or does it sit around for periods of time?
bloody hell where have you been hiding!!
He saw you coming.
brake discs should last a few years.

But in those 2000 miles you could be driving it hard, when pads go low and get grit and bits on the pads surface it can cause the discs to score.

both front and rear. the car gets used around 3 times a week. longest it sits around for is about 5 days.

lol fearthebassplayer, just been soooo busy lately
Without seeing the parts it can be hard to say for sure. Most times the conditions of brake parts can be objective. Is it possible that the mechanic that carried out the health check missed it? I find it hard to understand why a brake will wear so badly within a space on 2k miles unless you take the vehicle racing?
I wouldn't expect them to wear in that time in that case unless you were taking the car on regular track days thus destroying the pads and then damaging the discs without even hearing or feeling them grinding

Either the wear wasn't picked up 2000 miles ago or they were telling porkies.

Without looking at the old discs we aren't going to know which it is.
I don't think they've lied to me at the service and mot. thought about asking to see them but they could have just brought out any old discs for me to look at. I can feel the difference with new discs, much more responsive. I think its been missed at the health check but it should have been picked up in my opinion, just thought id ask other peoples thoughts as I could be completely wrong. the car hasn't been raced, its been driven very carefully really as since my accident in February im very wary of my driving now.
Would never go back to that garage again.
All break discs will have a lip on the outside after time this is not a problem and how the discs wear
Should only fail if brake disc is in such a condition that it is seriously weakened or insecure.
Edited by: "djnaff" 5th Jan 2014
A lip will develop on brake discs which is normal. Usually, a measurement on the thickness of the brake disc is required and compared with the minimum wear noted by the manufacturer. Typically, 40,000 miles upwards can be achieved however short journeys with lots of stop/start can cause them to wear much quicker. The fact you can feel a difference in braking would suggest they probably did need changing as long you are not having a placebo moment. If the car is not used frequently, surface rust will build up on the surface and this can increase the wear rate. Without actually seeing the disc, we will never know. An automatic transmission car will wear the brakes quicker because of brake creep. When were the discs last changed, what is the mileage and what car do you have?
djnaff

He saw you coming.



It is best to draw the curtains during these early dark nights. oO

http://www.gifsforum.com/images/gif/approval/grand/weirdo__gif.gif
No am saying the rules no longer take into account out pitting and corrosion
If the car passes the breaking tests the new wording is seriously weakened or insecure. is the only fail on the disc
not a placebo moment, my boyfriend can also feel a significant difference. its a fiesta st with 30500 miles on. ive only owned the car since march so don't know if its had any disc changes before ive bought it. I totally understand and think the discs did need changing, but my thinking is this should have been picked up at the health check and I should have been informed of it then. I still have the paperwork for the health check and I have mentioned this to the garage when I picked my car up, they couldn't give me any real answers so I have asked that the service manager calls me on Tuesday when its my day off
It sounds reasonable to assume that they are worn and unless the wear was excessive the health check wouldn't pick it up as its usually a quick visual overview.As with any other trade one mans MOT failure is anothers Pass usually if its a marginal issue they will give you an advisory to replace items as soon as practical after the MOT has been Passed.
donna-lou

not a placebo moment, my boyfriend can also feel a significant … not a placebo moment, my boyfriend can also feel a significant difference. its a fiesta st with 30500 miles on. ive only owned the car since march so don't know if its had any disc changes before ive bought it. I totally understand and think the discs did need changing, but my thinking is this should have been picked up at the health check and I should have been informed of it then. I still have the paperwork for the health check and I have mentioned this to the garage when I picked my car up, they couldn't give me any real answers so I have asked that the service manager calls me on Tuesday when its my day off



Sounds like things have picked up for the better since we last spoke
yeah definitely, its our 9 month anniversary today lol. it must be getting on for a year since I was last on here properly. bet ive missed loads
I was going to say theres no stopping him now but I guess there is X)
donna-lou

yeah definitely, its our 9 month anniversary today lol. it must be … yeah definitely, its our 9 month anniversary today lol. it must be getting on for a year since I was last on here properly. bet ive missed loads



Nah you've not missed much tbh - rather boring on here now lol
Did someone go to Kiwcfut?

Brake pads and discs when fitted properly and under normal driving conditions last well over 20K. Even if there is a lip on the disc, it is still perfectly fine to continue using, the time when they should be replaced is when the thickness does not meet the minimum thickness (i.e. an excessively large lip), it is cracked or warped.

Brake pads and be a bit more difficult as if they become contaminated with grease/oil etc then they need replaced as you cannot clean this off. The pads should wear evenly on both sides otherwise your calliper could be faulty.

As for the corrosion, well that'll just be surface rust which will quickly be removed by normal use, I've left a few of the cars i've owned for periods of 4 months+, parked up with the handbrake off. Came back and fired the car up and no problems with my brakes.

There is no way that your brakes have gone (in 2K miles) to being that bad, i can't comment on how bad they may have been back in August but for the garage not to mention that they may need replacing in the near future suggests that they have conned you.
whatsThePoint

I live about 100 yards from the sea and new discs corroded to the point … I live about 100 yards from the sea and new discs corroded to the point they really needed replacing after 6 months, they had only done about 20 miles oO



From brand new? I doubt it. If thats the case im going to open a new garage specialising in brake disc and pad replacement in Brighton, Dover, etc Will make a killing.

And if so the parts were defective when supplied, which again is doubtful.

Edited by: "mclovin9091" 5th Jan 2014
Businesses dont necessarily need to know many people they just need to provide a good service, for a relevant task. Also when i lived in Cyprus for two and a half years,on two occasions i had to leave my car unused for 4 and 5 month periods i wouldn't say 100 yards more like on the beach. As i said never had a problem, i have also had to do it in the UK as well.

Where the car was parked: 34.981509,33.720337 if you feel the need to check, and where i stayed, 34.981069,33.721879, 2nd floor with great sea veiws.
Cannot afford to pay - eh?
whatsThePoint

so not for 6 months in an area that has a lot of storms, thanks for … so not for 6 months in an area that has a lot of storms, thanks for clearing that up, I now see why you have trouble understanding a known fact



Yes for 6 months, 4 months away, 2 weeks back then 2 more months away. Just had the odd tornado and a few thunderstorms, along with high humidity.

Its a known fact that brake discs only last for 6 months if you live next to the sea, within 100 yards and in an area that has a lot of storms?

OK then. If it was known then they would surely come with a disclaimer and there would be a hell of a lot more people complaining about this problem. The manufacturers would then have to find a way around the problem, no?

Also if i were to try leaving a brake disc by the sea for 6 months, would not provide a valid comparison to a brake disc fitted to a vehicle.
whatsThePoint

I live about 100 yards from the sea and new discs corroded to the point … I live about 100 yards from the sea and new discs corroded to the point they really needed replacing after 6 months, they had only done about 20 miles oO



whatsThePoint

so you think they should have a disclaimer saying "don't park your car … so you think they should have a disclaimer saying "don't park your car for 6 months unused near the sea" because you feel its something that will effect 1000snot a problem, if you feel just a disc isn't enough, feel free to use a complete car



Well clearly your brake discs were not unused for 6 months either.
Edited by: "mclovin9091" 5th Jan 2014
If it was an M. O. T. Fail you should be able to see the brake test figures on their machine then an after figure when discs and pads fitted. It doesn't take long at all for discs to corrode left some out overnight once( scrap ones) If the calliper's stick it can exascerbate the wear on pads and discs AND would show up on the rolling road brake test
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