Are Mtec C Hook discs directional ?

[Compo1]

Errr

So they are handed

J will go on left side, L will go on the right side.

So they will face front of car.

Or am I missing something

It's probably me.

Ill nip out and take some photos now.

 

[BigJase88]

If the manufacturer say they aren't directional then it doesn't matter a monkeys nuts which way they go

 

[Compo1]

So what i have now is the J hitting the top of the calliper driving forward ?

From what you lads are saying i need the L hitting the top of the calliper going forwards ?

So ive got the discs on the wrong side ?

 

[Damo H]

So what i have now is the J hitting the top of the calliper driving forward ?

From what you lads are saying i need the L hitting the top of the calliper going forwards ?

So ive got the discs on the wrong side ?

Ahh right so you think that the discs should be on opposite sides to each other.

Everything I've read by googling, is what I've already said, that its the internal veining that's important. So if this is non directional the grooves, drilled holes or J hooks is purely an aesthetic choice.

But this may help you. Picture of the left side (of the driver) on a track based Nissan GTR which DOES have directional internal veining. And the "Hooks" are the same orientation as yours.

So if that orientation is good enough for the front brakes on a track GTR, pretty sure its fine on the rear of a Leon

 

[Compo1]

Ahh right so you think that the discs should be on opposite sides to each other.

Everything I've read by googling, is what I've already said, that its the internal veining that's important. So if this is non directional the grooves, drilled holes or J hooks is purely an aesthetic choice.

But this may help you. Picture of the left side (of the driver) on a track based Nissan GTR which DOES have directional internal veining. And the "Hooks" are the same orientation as yours.

View attachment 32721

So if that orientation is good enough for the front brakes on a track GTR, pretty sure its fine on the rear of a Leon

Yep im sure they will.

Leaving them as they are then as the veins are straight anyway.

Thanks to all of you for helping appreciate it.

 

[Cuprabenwytm]

 

[SuperV8]

View attachment 33393

That quoted acceptable runout figure is way too high! - not to mention they can't even convert imperial to metric - 0.005" = 0.127mm! NOT 0.150mm.

Some OEM's are now specifying 0.030mm maximum installed runout! which is about 0.001"

 

[Cuprabenwytm]

That quoted acceptable runout figure is way too high! - not to mention they can't even convert imperial to metric - 0.005" = 0.127mm! NOT 0.150mm.

Some OEM's are now specifying 0.030mm maximum installed runout! which is about 0.001"

Had mine on now 1k miles and there sound

 

[SuperV8]

Had mine on now 1k miles and there sound

Did you measure your installed disc runout with a dial indicator?

My comment was aimed at the fitting tips shared - and the 'acceptable' runout figure of 0.150! which is absolutely not acceptable.

 

[Cuprabenwytm]

Noo did I heck bud lol I rubbed **** out of it with a wire brush and banged em on bedded em in , runout gages went to hand , would you recommend doing it

 

[SuperV8]

Noo did I heck bud lol I rubbed **** out of it with a wire brush and banged em on bedded em in , runout gages went to hand , would you recommend doing it

Measuring the installed disc runout can save ruining a set of discs in 1-2k miles.
If the discs are running out - then they wear thinner where the run out is as it rubs on the pad just in that one spot. This develops into DTV (disc thickness variation) which you will feel as brake judder.

 

[Polly]

My Cupra R AUDI branded front discs [RS3] are NOT handed or mirror image. They are exactly the same. THUS get hotter on the nearside. Warped one 11 months into warranty