ned
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| posted on 6/3/06 at 04:25 PM |
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grooved disc groove direction?
just about to fit my nice new brakes, which way should the grooves on the grooved discs face? towards the front of the car at the top or towards the
back? or does it make little or no difference?
cheers,
Ned.
beware, I've got yellow skin
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NS Dev
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| posted on 6/3/06 at 04:30 PM |
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Dunno the technical answer but I'd go for outermost part of the groove forward, so the pad is swept down onto the retaining recess in the
caliper. If it's swept upwards I guess it'll be pushing up onto the retaining pins??
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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donut
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| posted on 6/3/06 at 04:33 PM |
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I had the same prob Ned and the general thought was grooves forward at the top. There should be a sticker on the discs tell you which side it
fits????
found this pic of the near side front.
Image deleted by owner
Image deleted by owner
[Edited on 6/3/06 by donut]
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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ned
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| posted on 6/3/06 at 04:37 PM |
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i was actually just thinking the opposite so that the brake dust would be thrown out from the disc rather than pulled towards the centre. but then i
hadn't thought of pressure on the pad pins..
Ned.
 
Rescued attachment IMG_1856b.jpg
beware, I've got yellow skin
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ned
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| posted on 6/3/06 at 04:44 PM |
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always helps to read the instructions..
 
Rescued attachment IMG_1859b.jpg
beware, I've got yellow skin
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andyps
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| posted on 6/3/06 at 04:56 PM |
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I was about to reply that I thought Donut had them the right way round when you posted the instructions which I rememberd using when I fitted them! At
least my memory wasn't too bad.
Andy
An expert is someone who knows more and more about less and less
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donut
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| posted on 6/3/06 at 04:57 PM |
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Well there ya go! some say that way, some say this way!!!
What a crazy world we live in 
I'm buggered if i'm changing mine though!!
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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JoelP
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| posted on 6/3/06 at 05:04 PM |
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mine are wrong, to no ill effect 
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indykid
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| posted on 6/3/06 at 05:20 PM |
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i'm pretty sure ap racing's website says donut's way, and that's why we all went with that at the time.
it can't make that much difference though can it?
tom
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Mr G
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| posted on 6/3/06 at 05:53 PM |
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Drivers side the EBC way.
Cheers
G
Normal is getting dressed in clothes that you buy for work and driving through traffic in a
car that you are still paying for - in order to get to the job you need to pay for the clothes
and the car, and the house you leave vacant all day so you can afford to live in it.
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Peteff
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| posted on 6/3/06 at 06:02 PM |
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I thought it was different for the drilled ones to the ones with grooves only.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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flak monkey
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| posted on 6/3/06 at 06:05 PM |
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Some say one way, some another.
With them the way EBC say to fit them (outer edge of groove facing up on the front edge of the disc) any crap in the grooves is thrown out. The other
way around, the grroves just trap dust and dirt and dont get rid of it. No idea why you want to fit them the other way around to be honest, but I
guess I cant argue with the brake manufacturer eh?
David
Sera
http://www.motosera.com
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MkIndy7
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| posted on 6/3/06 at 06:30 PM |
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I thought grooves pointing forward were more agressive and noisier.
After searching Yahoo for images it seems racing cars have the grooves facing forward and road cars facing rearward, maybe this supports the noise and
harshness theory?
[Edited on 6/3/06 by MkIndy7]
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graememk
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| posted on 6/3/06 at 06:48 PM |
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depends if the groves go to the outside edge or not, if they do its to get rid of water quickly so groves pointing back, if the gove dosnt go to the
edge pointing forward to make braking better.
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graememk
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| posted on 6/3/06 at 06:50 PM |
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or point them forward to wair them out fast or back slow lol
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Hellfire
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| posted on 6/3/06 at 07:19 PM |
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Check the manufacturers recommendations 
(If you know who the manufacturer was, of course)
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tadltd
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| posted on 6/3/06 at 07:28 PM |
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We recommend that our discs are fitted in the same way as the EBC ones shown (also the same as Ned's instructions) - i.e. make sure the curve is
concave in the forward direction.
Ned - you have a U2U (ref' SPA gauge)...
Best Regards,
Steve.
www.turnerautosport.com
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jimmyjoebob
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| posted on 6/3/06 at 08:06 PM |
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From the braking assignment carried out a few years ago it shouldn't matter which way around the grooves face from a brake efficiency viewpoint.
Dust build up is unlikely to have been considered important to direction - the speed of airflow is likely to dislodge any particles before buildup
occurs. That is unless it hasn't been shaken out along with my fillings by the constant thudding of the wheels on every pothole in this
god-forsaken road network of ours....
The grooves merely allow the gas that the pad material releases when overheating to escape, preventing it from acting as a cushion between pad and
disc - otherwise known as brake fade.
If at first you don't succeed, hide all evidence you ever tried!
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Alfa145
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| posted on 6/3/06 at 08:28 PM |
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These are my RedDot 6 Groove fitted the way the instructions said, I had a few people query why they are fitted that way and ended up asking RedDot if
it was correct and they said it was, but their 20 & 40 groove ones fit the other way. I guess most manufactures have their own way and reasons
(the front of the car is on the left)
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Fozzie
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| posted on 6/3/06 at 09:15 PM |
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Ned, opposite way to Andy-mates (aka donut)!
Fozzie
'Racing is Life!...anything before or after is just waiting'....Steve McQueen
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ned
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| posted on 6/3/06 at 10:39 PM |
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well, while everyone has been debating it i have fitted them all
 
Rescued attachment IMG_1860b.jpg
beware, I've got yellow skin
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ned
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| posted on 6/3/06 at 10:42 PM |
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more..
 
Rescued attachment IMG_1862b.jpg
beware, I've got yellow skin
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MkIndy7
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| posted on 6/3/06 at 10:45 PM |
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Another spanner to throw into the equation.
It might be to do with the shape and number of the grooves cut in the disk as to which way around there to be used.
I've got 36 square cut grooves going the opposite way to those last pictured (alfa147's) but they are rather "noisy" i.e you
do hear a slight grating noise as they are applied lightly.
On the kit car we've got (probably 18) grooves going the same way but with rounded edges (like greenstuffs) cut with a ball end cutter and
theres no extra noise at all compared to standard.
I'd hate to think the 36 groove versions would make and more noise if the grooves went the other way.
[Edited on 6/3/06 by MkIndy7]
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NS Dev
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| posted on 7/3/06 at 09:14 AM |
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Going back to my point about pad retention...........................
If the brakes make a "grating" or slight vibration under light braking, then the pads are vibrating.
If they are, then they want to be pushing the pad against an abutment if there is one.
Now different calipers support the pad in different places.
Those with std sierra calipers can do what they like cos the pad is totally supported on abutments, but on my RaceLeda calipers, the abutments are on
the "hub side" of the caliper, nearest the disc centre, hence "pulling" the pad inwards.
Looking at your Hi-Spec calipers Ned, they don't look like they have abutments at all, so I guess it doesn't matter!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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MkIndy7
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| posted on 7/3/06 at 04:50 PM |
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quote:
Originally posted by NS Dev
Going back to my point about pad retention...........................
If the brakes make a "grating" or slight vibration under light braking, then the pads are vibrating.
Not to discount this info completely but my 36 groove disks with the square edeges are on Sierra calipers and still make a grating noise.
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