Help!! need to replace rear discs but cant decide wether to go grooved and drilled or smooth will be using red stuff pads,heard grooved are noisey

 

On the rear, smooth & vented EBC's if using red stuff ceramic pads

 

If they're the same price and exactly the same quality of discs then you might as well have grooved. If the grooved are not such good quality discs for the same money, or more expensive, then don't bother, just get plain. The rears don't do much anyway.

 

avoid drilled like a 40 year old ***** on crack!
grooved is the way but if the fronts are plain I would probably get plain for the rears as well

 

avoid drilled like a 40 year old ***** on crack!
grooved is the way but if the fronts are plain I would probably get plain for the rears as well

 

anyone know the size of standard rear discs on a my94 wrx

 

266mm

 

cheers matey

 

Jay go for grooved only - not drilled.

 

Why does everyone say avoid drilled?

I understand the theory that they are prone to cracking due to heat.

They are fitted as standard to some cars though so surely they can't all be bad?

 

it depends on how they are made, and the materials used in the construction of the discs. The cheaper discs available for subaru that are drilled are generally not the best quality and hence the cracking.

Cars like Ferraris that have them well you can imagine the quality! (and the costs )

 

Plus the holes on the quality discs are cast during manufacture rather than drilled after manufacture

 

If you look at what cars have drilled as standard you're talking about basically Porsche 911s. Which are renowned as having the best factory brakes ever. Unless you're paying a hell of a lot of money for them, drilled holes are just a weak point. Grooves have no downsides at all, apart from some people say they can whirr a bit when you're using them -I've never noticed this though.

 

The Porsche holes aren't drilled, they're cast!