Brake Rotor Rivets
Tech Contributor
Joined: Aug 1999
Posts: 15,175
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From: Connecticut, USA
New rotors will work; they come in 005" under original thickness. GM rotors among the best. If they are still range for thickness a simple DA flat grind with 100 grit will deglaze them. How the mating surfaces are prepped makes a huge difference in the outcome for runout. I have been tapping and bolting them on for decades and getting the runout under 003" every time. Works well, so much so some current wanna-be's have been claiming it and copying it.
Regardless of whether new or old rotors are used, they have to be checked, prepped, and dialed in. Turning front rotor assemblies on the conventional brake lathes works. Turning rear rotors other than using an on the car lathe or turning the axle/rotor as one won't work. Many rear rotors were wrecked by turning them on a brake or toolroom lathe since they are not concentric with the axle centerline and will introduce, not reduce, runout.
I won't use or ship out rear TA with rotors with runout over .0025"
Regardless of whether new or old rotors are used, they have to be checked, prepped, and dialed in. Turning front rotor assemblies on the conventional brake lathes works. Turning rear rotors other than using an on the car lathe or turning the axle/rotor as one won't work. Many rear rotors were wrecked by turning them on a brake or toolroom lathe since they are not concentric with the axle centerline and will introduce, not reduce, runout.
I won't use or ship out rear TA with rotors with runout over .0025"
Thread Starter
Racer
Joined: May 2005
Posts: 334
Likes: 110
From: Canton GA
Got it put back together today and bled. Should have done more research on the Motive pressure bleeder plate before trying. Used the J-hooks and chains, pressured it up, and had a puddle of brake fluid on the floor. Got rid of the J-hooks and chains, and used a large c-clamp and grip clamp and it held 10 psi just fine. Seem to bleed well but the pedal is softer than I like. Will go back through it again.
Finally got to drive the vehicle for the first time.
Finally got to drive the vehicle for the first time.
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From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
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Good to be able to drive it. If your pedal is soft sometimes driving it helps bounce those air bubbles loose and giving it another bleed will get em out. Sometimes it works, sometimes it doesn't.
If you have runout in those new rotors you'll never get a good pedal.
If you have runout in those new rotors you'll never get a good pedal.
Thread Starter
Racer
Joined: May 2005
Posts: 334
Likes: 110
From: Canton GA
Yep, plan on bleeding again soon. Thank you.
Thread Starter
Racer
Joined: May 2005
Posts: 334
Likes: 110
From: Canton GA
Race Director
Joined: Nov 2006
Posts: 13,248
Likes: 7,837
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
I'm thinking they shouldn't be more than .005 inch. Or 5 thousands of an inch. 4 mils sounds huge.
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Thread Starter
Racer
Joined: May 2005
Posts: 334
Likes: 110
From: Canton GA
Mils is an old term for thousandth of an inch. Easier to say 4 mils than 4 thousandth of an inch.
Not my definition but: The term "mil" is derived from the Latin word "mille," meaning thousand, and is commonly used to denote a measurement of one-thousandth of an inch (0.001 inches).
Not my definition but: The term "mil" is derived from the Latin word "mille," meaning thousand, and is commonly used to denote a measurement of one-thousandth of an inch (0.001 inches).
Race Director
Joined: Nov 2006
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From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
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I believe it's commonly used in the metric system. Which I am surrounded by here in Australia.
