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Author Topic:   stock brake rotors
Speedway65
Dirt Freak

Total posts: 344
posted September 08, 2004 06:36 AM  
We have to run stock brake rotors on our car
3146LBS metric 3/8 mile high banked.We lost a left front one on Friday,it broke out from the center.We checked the right side and it was the same way,just not broken yet!Anybody have any idea or suggestions on what might have caused this?Just a side note we do not use brand new ones.We used slightly used and heat cycled ones.

[This message has been edited by Speedway65 (edited September 08, 2004).]

marshalr
Dirt Maniac

Total posts: 148
posted September 08, 2004 07:42 AM  
Something is wrong there.
I've run the same rotors for years at a time. Couple of ideas though:
- Do you torque the wheels constantly - 100 ft/lbs for a steel wheel.
- Do you use an impact wrench to tighten the lugs, might be overtightening.
- Are the hubs drilled for 5/8" studs ? maybe drilled with holes off just a bit creating a stress in the hub.
- Do you ever get broken studs ?
- It's early and i've only had half a cup of inspiration, but that's where i'd begin my investigation.

Speedway65
Dirt Freak

Total posts: 344
posted September 08, 2004 08:07 AM  
NO,BUT NOW WE WILL
YES ELECTRIC IMPACT
NO 1/2 STUDS
NO BROKEN STUDS

eborcim
Dirt Freak

Total posts: 303
posted September 08, 2004 12:36 PM  
Stock metric rotors don't hold up too well after rubbing the wall pretty hard or another car. I check them after any contact since one came apart and sent me into the wall.

Speedway65
Dirt Freak

Total posts: 344
posted September 08, 2004 01:25 PM  
We have never hit the wall once this season{knock on wood}And very little contact with other cars to our wheels.And now the rotors have gone way up on our maintenence list.We change rear axles after 8 races maybe we will have to start doing rotors too!

[This message has been edited by Speedway65 (edited September 08, 2004).]

stic8
Dirt Full Roller

Total posts: 69
posted September 08, 2004 02:27 PM  
what is a slightly used and heat cycled ones, are they from a parts car or a junk yard

marshalr
Dirt Maniac

Total posts: 148
posted September 08, 2004 02:30 PM  
The track you race on must be exceptionally rough. 8 races on an axle ?
I have seen them break, i have found them cracked on my cars, I check axles religiously after each race, but i'm amazed that you replace them after 8 races.
I run a camaro, possibly a stronger axle?
You are a smart racer to stay on top of stuff like that though. I come from an aviation background and thus firmly believe in regular inspections and maintenance.
Keep up the hard work, it pays off.

Speedway65
Dirt Freak

Total posts: 344
posted September 08, 2004 02:35 PM  
Stic we use them from parts cars not junkyards.And as for the axles marshair it just a rule of thumb on that figure of 8 races.And our track doesn't really get that rough it is exceptionally smooth most of the time!!

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 08, 2004 03:41 PM  
Metrics - OEM from the salvage yard is the way to go, ive junked brand new parts store rotors, drilling and pressing 5/8 studs in. the casting quality is not very good. One from the salvage yard will be 5$ if that. For the best in safty is the colman safty hub, its billet steel.

mrutrac
Dirt Roller

Total posts: 22
posted September 13, 2004 06:43 AM  
Had the same thing happen twice this year and found out why. The master cylinder was not releasing its pressure when I hit the brakes. We were wicked fast in the heats (never used brakes) but I fell fast during the feature. So basically we had a car with its brakes on and a ton of heat was being genereated. Then one night after the feature we jacked up the car and tried to turn the tire and bingo... you could not turn them.

Bought a new master cylinder and put the right fluid in (had put dot 5 in an oem part)and problem is fixed... and got a few wins.

Hope this helps...

Dave

    

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