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#1
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Is it possible for Rotors to "unwarp"?
Hey all. I think lately my rotors seemed to have corrected themselves. Usually when I brake moderately from 60-70 I get the shuddering from the rotors but last week I stopped hard a few times and now when I stop from 60-70 theres no more shuddering. Could braking hard those few times have somehow rewarped my rotors straight?
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Tim 92 Liquid Silver SVX 5MT 2009 BMW Z4 (Gone) 2012 Camry V6 SE |
#2
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Re: Is it possible for Rotors to "unwarp"?
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2005 RX-8 Grand Touring 2005 Outback 2002 Mercedes-Benz E320 wagon END OF LINE |
#3
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There was a lot of discussion on this subject a while ago. One expert opininon suggested that some of the pulsing that is experienced is actually not warpage, but deposits of brake lining on the rotor surface. These deposits can be removed by a few hard stops. Perhaps this is what you have experienced.
Matt
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Mattski 97 LSi Ebony Pearl 130k Midlife Crisis 93 Legacy Wagon 180k Training Wheels 98 Outback 180k 98 Dodge Durango 120k Ski Bus A multitude of skis to feed my need to go faster, faster until the thrill of speed overcomes the fear of death. |
#4
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I unwarped my wifes rotors by torqueing all the lug nuts equally. I'm still in disbelief but so far it has not had any shudder since I did this and it used to all the time.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#5
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Out of interest I have been following the many posts regarding " warped " rotors ( what we call the disc as being a component of a disc brake assembly ) and there would seem to be confusion in the use of the term. Surely a warped rotor is one running laterally out of true and is in effect bent and not one which has surface defects.
Do all reporting rotor problems use the term correctly ? Or inadvertently are two quite separate problems being reported as being the same, in which case the issue has become completely confused.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#6
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I believe there is confusion of terms here. We are using "warped rotors" as a blanket term to describe the pulsating brake pedal feeling and/or shuddering of the steering wheel under braking.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#7
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Therefore I AM confused. Which is the endemic problem ? Bent rotors or rotors worn so that the surface is out of true ?
It is reported that lug nut tightening can produce the problem in which case latteral run out must be the problem. It would appear that there IS real confusion here.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#8
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Disk warping.
Morning Trev.
The disk does warp when hot, because it is a sand casting that varies, in the thickness of the metal in the disk area. In production the casting is grabbed by the jig to machine the surface, if the jig holds it a bit off line, the metal in one area of the disk is thicker, than the area diametrical opposite. The two faces are still parallel but of varying thickness so the expansion rate is different around the surface,so warping happens. The warping disappears when the disk cools. The other way, is if the wheel nuts are torque unevenly. This type of warping is really run out, caused by distortion. Torquing the nuts to an even 80 ft /lbs will cure this one. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#9
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Yes, yes Harvey I know all that which is why I raised the query. Some appear to be quoting uneven wear or build up as being the same problem. I define warping exactly as is stated in all dictionaries but confusion could be lumping the two issues together.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#10
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Re: Is it possible for Rotors to "unwarp"?
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Nice to hear it worked for someone else. Always worth a try,as long as pads are still good, before turning rotors or rebuilding sticking calipher pistons.
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May your transmission live forever. SuperbVehicleXtraordinary Proud sponsor of a 1992 SVX. |
#11
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Re: Is it possible for Rotors to "unwarp"?
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Tapper |
#12
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Using a torque wrench and some hard stops seems to be working for me also.
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