iDisc brakes, is this the correct direction?

[zorba_the_greek]

I was just wondering if anyone was running FERODO DS performance discs with FERODO DS2500 pads?

Can anyone confirm if the discs are directional? They look really weird on the car as the grooves and blind drill holes are not facing the forward position (in the picture clock wise). Had them fitted last week and the garage said that they are the correct way round...

I had Brembo discs last time and the grooves and blind drill holes where facing the forward position.

[maniac0796]

Well what side is that wheel

[zorba_the_greek]

maniac0796 said:

Well what side is that wheel

The one in the picture in the drivers side of a RHD car. Sothe forward direction the car would be moving is clockwise

[russell_ram]

I'm with you here OP, not sure if in reality it actually makes any difference but i would've fitted them the other way round - that wheel should rotate anti-clockwise ie be LHF wheel. That way, the grooves naturally 'wipe' water/gasses (or whatever) to the outside of the disc on brake application.

[zorba_the_greek]

On another forum thread i had posed the question the following posted was writtern.

///quote///

don't know about ferodo in particular but I understand that generally you can slotted disks either way around. I beleive it's often thought that running the grooves against the direction of travel gives better performance but at the expense of higher pad wear.

///unquote///

[russell_ram]

" running the grooves against the direction of travel gives better performance but at the expense of higher pad wear "

How does it do that then? The holes and groove wipe across the pad at exactly the same angle which ever way the wheel is rotating, so braking efficiency will be the same. Surely the whole idea of grooves/dimples is to expel gasses/water - this must work better when aided by centrifugal force rather than working against it?

Agree that you'd probably not notice a difference in reality tough.

[PhillipM]

If the vents inside are curved, they should be orientated to pump air from inside to out, other than that, it doesn't matter.

[bertelli_1]

PhillipM said:

If the vents inside are curved, they should be orientated to pump air from inside to out, other than that, it doesn't matter.

Listen to this man. The direction of the grooves doesn't matter - you should be looking at the direction of the vents.

[stevieturbo]

PhillipM said:

If the vents inside are curved, they should be orientated to pump air from inside to out, other than that, it doesn't matter.

Quite correct.

[mrmr96]

stevieturbo said:

PhillipM said:

If the vents inside are curved, they should be orientated to pump air from inside to out, other than that, it doesn't matter.

Quite correct.

This is correct. The vanes on the inside should pump from the centre to the outside. The grooves on the face are of no consequence whatsoever.