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BA0073 02-11-2013 05:41 PM
Brakes
 
Question: been told DONT run drilled/slotted rotors front or rear on my Cobra unless you intend to race. I want to replace the drums in back with disc's. no problem but was told if you dont buy Baer or wilwood (high $ rotors) you will burn brake and wrap rotor's, something about they take OEM parts and drill/slot them but the metal compound is weak. Is it worth it for the street. I would like your input guys.

Tommy 02-11-2013 06:24 PM
If the guy(s) who was giving you advice was trying to sell you something, you ought to talk to someone else.
1. Drilled and slotted rotors aren't essential to good working brakes, especially for the street.
2. The front brakes do most of the work in stopping your car, so switching from drums to discs on the rear won't yield a noticeable improvement stopping IMO. It also won't put much heat into your rear brake rotors unless they are significantly undersized.
3. Lots of Cobra replicas, including mine, use factory style brakes designed for much heavier cars. Mine work fine even on the track with repeated max performance braking from 140 MPH.

Car Nut 02-11-2013 06:37 PM
Quote:
Originally Posted by Tommy (Post 1230810)
If the guy(s) who was giving you advice was trying to sell you something, you ought to talk to someone else.
1. Drilled and slotted rotors aren't essential to good working brakes, especially for the street.
2. The front brakes do most of the work in stopping your car, so switching from drums to discs on the rear won't yield a noticeable improvement stopping IMO. It also won't put much heat into your rear brake rotors unless they are significantly undersized.
3. Lots of Cobra replicas, including mine, use factory style brakes designed for much heavier cars. Mine work fine even on the track with repeated max performance braking from 140 MPH.
Plus pad wear is more

Holes and slots can the be the starting point for a crack.

They look cool.

mikiec 02-11-2013 06:41 PM
Stick with what you have.

lippy 02-11-2013 07:16 PM
My understanding is that slotted/drilled rotors dissipate heat only marginally better but are weaker and can't be turned. But they look cool.

Danr55 02-11-2013 07:25 PM
What Lippy said. If you want to run discs and you're not going to race, stick with conventionals.

951mat 02-11-2013 07:42 PM
Slotted rotors are wonderful..... in the rain. Since I won't race in the rain, I don't feel the need for them. On a closed in car, sure they would be great. I wouldn't bother unless you just want that look.

Mat

bobcowan 02-12-2013 07:42 AM
Drilled holes and dimples are simply for bling. They provide no additional performance advantage. The holes have a tendency to propagate stress cracks, which require rotor replacement.

Slots are there to shave off a small amount of material with each sweep - kind of like a cheese slicer. When you're racing, the pads can get glazed from repeated hard stops. The slots help to keep a fresh surface.

On the street, or with autocross and drag racing, simple solid rotors are the most effective with a low cost.

Bill E 02-12-2013 10:07 AM
Holes no. Slots yes. Slots relive gas pusher under hi timp. with significantly increases performance of the brake. Holes look cool but have no advantage over slots. Holes only lighten the rotor and can be the start of a crake. Disk are cool but drums work just fine. There is a lot moor to putting disks on and making them work then you might think.

Mike Brasfield 02-12-2013 11:29 AM
It's a myth that slotted and drilled rotors can't be turned. I Just had it done on my 13" cobra mustang (slotted and drilled) rotors. The local auto parts stores (autozone, pep boys, etc) won't turn them but a good machine shop can. The one I use (Basko) does it on a flywheel machine that give it a circular cut, which is best. I asked, "are these better or worse than a plain solid rotor?" Ray said "better, dissipates heat better". I'll take his word for it.

BA0073 02-14-2013 07:48 PM
I thank you all for the input I will just stick with a OEM style rotor for now.

Mike Brasfield 02-15-2013 08:00 AM
Good choice

mikiec 02-15-2013 10:55 AM
What he said.

Danr55 02-15-2013 01:27 PM
What they said.

Fitz 02-15-2013 08:17 PM
What all them there guys said:LOL:

Scotchman 02-18-2013 11:39 AM
No wonder youse guys have so many posts. What Fitz said.:eek:


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