i am searching for some in-expensive(if there is such a thing right!)slotted front rotors,i found some on ebay for 90$ for a set.is this a good buy?and are drilled rotors good for a daily driver?thanks

 

I'd be leery of no-name brake parts sold on e-bay...
Drilled and/or slotted rotors have no advantage for braking under 80 mph, other than looking good, and the slotted rotors actually eat pads faster. That's why OEM rotors from Mercedes and others are only drilled, rarely slotted.

 

You can find them on Ebay for $75 shipped.

Cheap no name brand 6mo solid rotors from AZ are only $5 less so I couldn't see buying them. sellers name is ecarparts2003

 

Cheap rotors are cheap rotors so for $5 more I went for fancy looking ones.

 

I kind of asked this in my other thread, so you would not recommend these-
http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT

 

Drilled and slotted have no performance value in braking at all. They are nothing more than an appearance item now. The only thing that one might consider an advantage is the unsprung weight savings.

 

Drills are merely to reduce rotation weight. They reduce surface contactarea and will cause a reduction of braking power. The holes in the rotors will though give a better initial bite of the brake pad making the brake pedal feel better when first depressed.

What drilled rotors are good for? you can take 2 rotors for comparison, one a 12" solid, the other a 13" drilled. Bioth will have about the same rotation mass, but the drilled 13" will still have more surface are even when drilled and will also have more leverage on stopping power. Given the correct application for drills, the drilled rotors will have an advantage. I would recommend you not use them in the stock size brake setup.

Slots- slots are good for scapping the surface of the pads ESPECIALLY if you get on the brakes hard often and overheat them. Slots do wear the pads quicker, but they also remove glazing from heat buildup. If slots did nothing, then why do Trans Am Series racecars still use them to this day? Because slots have usefulness in cleaning the pad surface even with modern day pad compounds.

 

Slots do work. That was the first mod I did to my motorcycle. Went from solid disc to slotted and quick stopping improved 100%.
No more white knuckle oh **** I'm goin to fast to turn slow downs.
But bike rotor slots go all the way through.

 

i thought the purpose was to dissipate heat

 

No, the internal vanes are for disapating heat, you want as much MASS as you can in the rotor, so that it can obsorb the heat from the pad (keeping it away from the piston(s), and fluid). The more mass in the rotor, the more heat it can obsorb, and thus disapate out thru the vanes.

 

I thought they were to dissipate heat and vent the gasses built up by the braking process?

Anyway try GMPartsDirect.....I got my slotted/crossdrilled rotors for about $45 each back in the summer.

 

Drilled rotors help take heat and gases away from the pads, but not the rotors. Dewey is correct in saying that mass and the vanes is what cools the rotors. The more holes you drill into the rotors the more mass is taken away and the rotors will not dissapate heat as much- to a certain point. Smaller drilled holes will increase surface area of the iron rotors that touch the ambient air flowing over them. It is like heat sync's or cooling fins. What cooling fins do is increase the surface volume of the material the air is flowing over. It really is a give and take on brake rotors and no substantial eveidence can be obtained to say just how much or where the holes being drilled will help or hurt- It is mainly done for looks since it HAS been proven on race cars that SOME drilled rotors will crack in very high temps from the drilled holes.

If temp is not an issue (meaning you do not run the car hard enough to get the brakes hot enough to cause problems) then drilled rotors will decrease the rotation mass of the car under acceleration and deceleration.

I run them plain and simply because I opted for larger diameter yet leighter weight with the drills for leverage in braking. I choose the large diameter drilled rotors over the smaller diameter undrilled rotors when they are both aprox the same rotation mass.

I also happen to like drilled rotors on street cars because the drilled rotors give the pads a better initial contact and a better initial brake pedal feel/ response.

 

I looked on that site and didn't see them...you got a part number handy?

 

You'll have to e-mail them or call your local dealer. Mine aren't stock 3rd gen ones....they are Z06 rotors.

 

Dean's banned AGAIN? That one only lasted 45 posts...good grief, Charlie Brown...

In any case, I recently purchased a pair of C5 Baer Eradispeed rotors since the price was gonna go up in '06, from $239 to $306 actually, and I got them for $235 shipped. I have to admit, they're some of the thickest castings I've ever seen. I'll post pics of them next to a stock C5 rotor soon. The difference is obvious.


Ed