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comments on these brake discs?
02GF74 - 29/7/09 at 03:24 PM

what do you say? good or bad?



mkr 3/4/5 cortina, £ 55 inc. (probably generic pic as should have 4 bolts)

tomgregory2000 - 29/7/09 at 03:48 PM

should be fine, if anthing they will prob crack on one of the drillings

[Edited on 29/7/09 by tomgregory2000]

nick205 - 29/7/09 at 03:49 PM

erm...they're round!


Your car seems to be getting a few treats at the moment

[Edited on 29/7/09 by nick205]

MikeRJ - 29/7/09 at 05:42 PM

I'd avoid any drilled disks to be honest, it's just an invitation to early cracking, and on an unvented disk they are ineffective anyway.

02GF74 - 29/7/09 at 08:03 PM

quote:
Originally posted by MikeRJ
I'd avoid any drilled disks to be honest, it's just an invitation to early cracking, and on an unvented disk they are ineffective anyway.

I neither agree or disagree ... but then aren't all sport bike discs drilled and have been for quite a few years - if there was a problem with cracking, they would not be made?

Admitedly I am comparing bike disc with chunky 70s car disc but what do I know?

a drilled bike disc 10 years ago.

bassett - 29/7/09 at 09:12 PM

i have them but i imagine they are OTT and i wouldnt call my front end braking amazing. Because of the weight of the car and the little force needed to stop next time i really wouldnt bother and just get good old plain discs, braking may even be better as pads are kept in the temperature range

coozer - 30/7/09 at 07:36 AM

They look nice, will enhance the bling when peeps gaze at your wheels.

Don't compare them to bike discs tho, different application, forces, materials etc.

If you like them buy them. If the plain variety are cheaper and youe don't mind the boring look ot them, get them instead.

DarrenW - 30/7/09 at 08:35 AM

I know why discs are drilled and grooved, but has anyone ever looked into at what point the number of holes etc reduce the effective braking surface and outweigh any advantage from them being there?

I suspect OE drilled discs undergo a bit more testing and development than cheaper aftermarket ones to avoid the issues mentioned above.

MikeRJ - 30/7/09 at 12:13 PM

quote:
Originally posted by 02GF74
quote:
Originally posted by MikeRJ
I'd avoid any drilled disks to be honest, it's just an invitation to early cracking, and on an unvented disk they are ineffective anyway.

I neither agree or disagree ... but then aren't all sport bike discs drilled and have been for quite a few years - if there was a problem with cracking, they would not be made?


Bike discs do crack actually, it's not an uncommon failure. However, an OEM disk designed to be drilled is rather different from a cheap plain casting that has been drilled to add £££'s to it's retail cost.

Grooved discs may help a bit, if you can put up with the silly noise and shorter pad life, but I replaced the grooved discs on my Fiat Coupe turbo with plain ones and OEM pads and the brakes were significantly improved.