Why Rotors Warp - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-18-2005, 02:56 PM   #1
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Default Why Rotors Warp

Took the SSEi to a local garage to have the tires balanced this morning. On a hunch, I took my torque wrench, a short extension, and a 3/4" deep socket along. When they were done, before I drove away, I torqued all the lug nuts to 100 ft-lbs. They had used an impact wrench to tighten the nuts. On the left front front wheel, here are the torque settings I found as I tightened the nuts in a star pattern:

..................................40

.......................80..................70

.............................50.......60

With this kind of uneven tightening, is it any wonder that rotors warp? Of course, they do brakes, too. I'll bet they change a lot of rotors.
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Old 10-18-2005, 03:05 PM   #2
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Don't trust mechanics who use an impact and a regular socket to tighten lug nuts. They need to use a 100 ft lbs sticks to tighten lug nuts. as a Matter of fact, they should be tightened to 75, and the rest done with a torque wrench. Yes, its the #1 cause of warped rotors.
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Old 10-18-2005, 03:15 PM   #3
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That'* crazy.

It'* tough enough to keep rotors from warping even when the wheels are torqued properly. They're definitely not helping the cause.
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Old 10-18-2005, 03:35 PM   #4
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I can't understand why you guys keep warping rotors. I'm brutal on them...
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Old 10-18-2005, 04:01 PM   #5
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Quote:
Originally Posted by BillBoost37
I can't understand why you guys keep warping rotors. I'm brutal on them...
I bought a better set of rotors for my 95, I installed them in August... They were a bit beefire than the ones I had( cheapies ) ... The cheapies warpped in a month... So far these are still good, car stops smooth even after a lot of stop and go driving...

And wow.... That is a funky way to torque lugs.... I watched sears do it once, I firsy saw them use an impact, then they lowered the car onto the ground and torqued all of the lugs to spec with a torque wrench

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Old 10-18-2005, 04:23 PM   #6
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Do "torque sticks" work? Last time I got new tires, I was in the shop while the guy was working. I said "I don't know what your usual practice is, but please don't use an impact wrench on the lugs." He said that he uses 80 lb torque sticks with his impact wrench and it seems to work well.

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Old 10-18-2005, 04:33 PM   #7
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Never heard of a torque stick, but now you got me wondering what it is too!
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Old 10-18-2005, 05:15 PM   #8
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....great. I just had new sneakers put on my Bonne today......makes me wonder if my lugs are torqued properly....I'd hate to go around with a "screw loose" <grin> so to speak.
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Old 10-18-2005, 05:19 PM   #9
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Originally Posted by singscountry1967
....great. I just had new sneakers put on my Bonne today......makes me wonder if my lugs are torqued properly....I'd hate to go around with a "screw loose" <grin> so to speak.
Guaranteed they prolly didn't torque to spec.

The sticks limit torque at a certain value. They are better than just squeezin the trigger on an impact and quick.

Costco actually uses the sticks then torques by hand.
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Old 10-18-2005, 06:05 PM   #10
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Quote:
Originally Posted by singscountry1967
....great. I just had new sneakers put on my Bonne today......makes me wonder if my lugs are torqued properly....I'd hate to go around with a "screw loose" <grin> so to speak.
just don't go autocrossing between now and NEBF. If your brakes are still making noise I am sure we will have your tires off anyway.
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