V70 Brakes: Warped discs. Urban myth?

[AndyV7o]

I intend to do this with mine. I just need to verify they'll fit in the 16" mimas alloys (looks enough clearance, plus, the 286 fit inside 15" wheels) and find some carriers...

[davebb]

Hi Andy , you do find them on here some times, I got mine from ebay, I paid £40 they came with callipers(that I did not use) they came from a T5,
I don't know what Volvo charge for them,
I think they will fit with 16" wheels, you do not have to change the pipes,
Dave

[rickmethven]

Originally Posted by oragex

Try looking at this video at 2:45 https://www.youtube.com/watch?v=cH-f0Q1K5H8




I had a hub distorted after hammering the wheel bearing. One way to see if the hub is distorted, is the wheel lugs would loosen by themselves within a few minutes of driving

I've had quality discs fitted both times...not mintex but can't remember the brand. My alloys are badly corroded so this may be an answer....will check at the weekend.

[canis]

Originally Posted by AndyV7o

Except that some cases of 'warping' arent warping but spots of pad residue from holding hot brakes on (which can often be got rid of by a few hard braking sequences), cementite forming from excessively hot brakes being held on (usually a binding caliper, or very irresponsible speeds) which cannot be got rid of at all, lumps formed by corrosion, varying disc thickness due to varying density of material (cheap discs), disc and/or pad contamination, etc etc.....

These are also not myths, granted.

Originally Posted by AndyV7o

I didnt take too much notice of the original posts as they are 6 years old, but basically, the 'technique' originally posted will have simply removed pad residue and high spots, its not accurate or stable enough to skim a disc in the correct sense.

Yes, it's really rather absurd to take a handheld tool to a disc.

Originally Posted by AndyV7o

Most 'warping' isnt warping, but it does happen, regardless, its become a term for disc defects causing judder, as people understand the term readily without any technical stuff getting in the way...

Point taken.

[petey]

There’s a fair chance that taking the disc off and putting it back on again will help, just by dint of the operator cleaning up the hub of the rust and crap that gets behind it....

Most common cause of brake judder? Holding the vehicle on the service brake after heavy applications. America, almost entirely populated by automatic transmissions, makes a fair penny out of routinely skimming brake discs....

[Georgeandkira]

For years, after exiting a highway and awaiting the light to turn green, I take my foot off the service brake and lightly apply the hand brake to avoid the deposits mentioned here.

It's a sorry state of affairs when you consider the likelihood of the engineers knowing exactly what compounds both rotor and pad need be made of.