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Old Aug 9th, 2020, 16:57   #1
Bobbby3000
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i am now on my 2nd pair of front discs that are now starting to warp. could this be a caliper problem.the car is used every day i dont use exsesive brakeing .any ideas giys please.thanks Bob
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Old Aug 9th, 2020, 17:06   #2
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Originally Posted by Bobbby3000 View Post
i am now on my 2nd pair of front discs that are now starting to warp. could this be a caliper problem.the car is used every day i dont use exsesive brakeing .any ideas giys please.thanks Bob
What car and what mileage have the discs done? A little basic info helps tremendously.
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Old Aug 9th, 2020, 20:39   #3
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What brand discs are they? Do you have a sticking caliper perhaps? Do you hold car on footbrake after hard/long stops?
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Old Aug 9th, 2020, 21:43   #4
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https://blog.fcpeuro.com/warped-brak...-internet-myth
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Old Aug 9th, 2020, 21:56   #5
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That doesnt mention (unless I missed it, only skimmed) the formation of cementite which results from overheating and localised heat concentration.
Some people say its not possible on a road car, but let me assure you, it is! Seen/dealt with it first-hand. No amount of skimming can solve the problem, new disks only.
Some discs are just bad, mintex for example, and wear/and/or deal with heat poorly causing distortion and/or variation of thickness, etc.
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Old Aug 9th, 2020, 22:48   #6
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Replaced mine with Pagid disc and pads; no discernible difference from OEM in my opinion.
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Old Aug 9th, 2020, 22:55   #7
green van man
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Originally Posted by AndyV7o View Post
That doesnt mention (unless I missed it, only skimmed) the formation of cementite which results from overheating and localised heat concentration.
Some people say its not possible on a road car, but let me assure you, it is! Seen/dealt with it first-hand. No amount of skimming can solve the problem, new disks only.
Some discs are just bad, mintex for example, and wear/and/or deal with heat poorly causing distortion and/or variation of thickness, etc.
Interesting you say Mintex are bad. It's a make I have used for years and currently have them all round on both the xc70 and discovery 1. Have never has a problem with them.
I expect to change disks every 3rd set of pads no matter what make, be it volvo or Mintex and have never found them worn to minimum thickness after 2 sets of pads, would not last the 3rd set hence the change.

The only time I had a problem with a mintex disk was when I picked up a stone off road and scored one, hardly the risks fault.

Not doubting your experiences but interested why you feel this way as my experience differs, am I missing something?

Paul.
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Old Aug 9th, 2020, 23:54   #8
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Interesting you say Mintex are bad. It's a make I have used for years and currently have them all round on both the xc70 and discovery 1. Have never has a problem with them.
I expect to change disks every 3rd set of pads no matter what make, be it volvo or Mintex and have never found them worn to minimum thickness after 2 sets of pads, would not last the 3rd set hence the change.

The only time I had a problem with a mintex disk was when I picked up a stone off road and scored one, hardly the risks fault.

Not doubting your experiences but interested why you feel this way as my experience differs, am I missing something?

Paul.
I've had repeated trouble with them wearing badly, distorting, etc. I had rear drums which were oval. The quality is visibly poor. They were genuine.
Im not alone in this either, I have read many reports of the same and spoken with people who have had same/similar experiences. Some could be down to negligent fitting, buy myself and others, as experienced mechanics, both home and professional, have gone to lengths to ensure and verify correct fitment and use yet still had premature issues.
Now, law of averages states some will have no trouble like yourself, some will have mixed results, etc, but the proportion of trouble for mintex is far far too high to be acceptable.
They have been realigned by tmd friction to be a budget brand (they didn't have one prior to acquiring mintex) which was essentially confirmed when I posted about this realignment on mintex facebook page and their reply was 'TMD friction cater for all budgets and requirements, we offer something for everyone, from entry up to premium'.
Mintex pads work well, they are a bit harsh on discs, giving a grainy, blued finish rather than a silver burnished finish, but nonetheless stop well. The discs and drums however are poor.
In this price point area, Apec are much better, their discs are quite nice for the money and were what ended the mintex problem period. The pads, not for sustained high temps but strong braking for general use and not quite as harsh as mintex. Pads between the two, pretty even tbh, discs, Apec every day.
I usually use Textar/TRW/Febi discs and Ferodo/TRW/Textar pads. Im currently (up front) trying Ferodo discs (with Ferodo pads), so far so good, but not a year in yet... My current rears, as it fell when very very skint, are Unipart discs with Apec pads. 13 months in, discs are doing the job but wearing well, pads very strong but just started to squeal this last week. Probably need a clean and refit...
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Old Aug 10th, 2020, 06:50   #9
green van man
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Quote:
Originally Posted by AndyV7o View Post
I've had repeated trouble with them wearing badly, distorting, etc. I had rear drums which were oval. The quality is visibly poor. They were genuine.
Im not alone in this either, I have read many reports of the same and spoken with people who have had same/similar experiences. Some could be down to negligent fitting, buy myself and others, as experienced mechanics, both home and professional, have gone to lengths to ensure and verify correct fitment and use yet still had premature issues.
Now, law of averages states some will have no trouble like yourself, some will have mixed results, etc, but the proportion of trouble for mintex is far far too high to be acceptable.
They have been realigned by tmd friction to be a budget brand (they didn't have one prior to acquiring mintex) which was essentially confirmed when I posted about this realignment on mintex facebook page and their reply was 'TMD friction cater for all budgets and requirements, we offer something for everyone, from entry up to premium'.
Mintex pads work well, they are a bit harsh on discs, giving a grainy, blued finish rather than a silver burnished finish, but nonetheless stop well. The discs and drums however are poor.
In this price point area, Apec are much better, their discs are quite nice for the money and were what ended the mintex problem period. The pads, not for sustained high temps but strong braking for general use and not quite as harsh as mintex. Pads between the two, pretty even tbh, discs, Apec every day.
I usually use Textar/TRW/Febi discs and Ferodo/TRW/Textar pads. Im currently (up front) trying Ferodo discs (with Ferodo pads), so far so good, but not a year in yet... My current rears, as it fell when very very skint, are Unipart discs with Apec pads. 13 months in, discs are doing the job but wearing well, pads very strong but just started to squeal this last week. Probably need a clean and refit...
Interesting.
I buy from a local independant motor factor supplying into the trade ( including local volvo dealers) as well as personal customers, have done for the past 17 years. They have very few returns on mintex but it's a couple of years since I bought the discs and things change.
Will be sure to ask before buying next set. All the disks on the volvo have nice even brushed steel look, rears on the discovery are a bit discoloured but that is down to the car, unless heavy towing the rears do not do enough work to keep them clean no matter what disks are fitted so they are normal for the car.

Thanks for the reply.

Paul.
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