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brake discs left and right? HELP!
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Old 16 Jun 2007, 05:37 PM   #1 (permalink)
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brake discs left and right? HELP!

HI,
Just fitted some drilled and grooved brake discs to my WRX.
When putting on 2nd disc I realised I'd place the one marked LH on the RH side, and vice versa.
Does this make a difference?
The discs had a sticky label on them stating LH and RH. This would have meant the groove/drilled holes spiral spiraling INWARDS when car is going forwards. I naturally whacked them on so the spiral would be spiraling OUTWARDS when car moving forwards.
Does anyone understand what I'm trying to say? haha.
ie I've fitted them so the holes nearest the hub/smallest PCD enter them pad area 1st. Although sticky labels stated the holes on the nearest the outer edge of the disc should enter pad 1st?
I'm lost, as 'I' think labels have been mixed up????????????
I need to find a pics of some other drilled/grooved discs fitted to a car as I'm sure I'm right, however I will be more than please if someone could correct/advise me?
thank you
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Old 16 Jun 2007, 05:48 PM   #2 (permalink)
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Please see pic, that is the nearside/passenger side/left hand side. Sticky label says this is WRONG. ????????????????????????????
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Old 16 Jun 2007, 07:15 PM   #3 (permalink)
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Also the ventilation vanes are not scooped type, they are straight. So I'm still lost.........................
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Old 16 Jun 2007, 07:41 PM   #4 (permalink)
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Quote:
I need to find a pics of some other drilled/grooved discs fitted to a car
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Old 16 Jun 2007, 07:58 PM   #5 (permalink)
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Hey thanks Pete,
Judging by those pics I am indeed wrong. However I've cut and paste this article from brakewarehouse.com for anyone thats interested. It appears to answer my question, but then conflicts itself at the end! Doh!

"Which direction should the discs rotate?
It is a popular misconception that the slots or drillings in a disc determine the
direction of rotation. In truth, for an internally vented disc, the geometry of the
vanes dictates the direction of rotation. There are three vane types in use:

Straight
Pillar vane (comprised of many small posts)
Curved vane

The first two vane types are non-directional, and can be used on either side of the vehicle. The curved vane disc, however, is directional. A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Please see figure. Orienting the disc in the manner creates a centrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc's ability to dissipate heat.

Additionally, all of Brembo's slotted discs are directional as well, regardless of the
vane geometry. The discs should be installed such that the end of the slot nearest
the outer edge of the disc contacts the pad first. Please see figure."
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Old 16 Jun 2007, 08:10 PM   #6 (permalink)
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Hi

The idea of the grooves are to let gases escape, anticlockwise its forcing the gases inwards.
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