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#1 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Posts: 805
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About 9 months ago I fitted a pair of DBA rotors (& Bendix Ultimate pads) to the front of the wagon, initially, (apart from the harder pedal I was told to expect from these pads) I was reasonably impressed with the slight increase in braking performance (it is series 1 after all). Over the last few weeks however, I have noticed the rotors starting to warp (pulsating pedal etc), so I removed them, had them machined, & during this process I was chatting to my mate at his workshop & he informed me that it's not uncommon for this to occur, the biggest cause of warping is apparently using a "rattle gun" (of which I'm guilty) to tighten the wheelnuts. He tells me that the (floating) rotors are actually "quite soft" & don't like the extra torque from the gun. I took his advice & shall monitor them over the next year or so, but I must say I was a little surprised by this. Am I the only person who was unaware of this issue with soft rotors???
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Removed by laminge |
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#2 | ||
BrwnBstd
Join Date: May 2006
Posts: 746
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I have slotted rotors and they do not wobble yet, but I admit it has not been in for treatment from a rattle gun yet either.
Will watch this thread I think, as I HATE the wobble! |
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#3 | ||
FF.Com.Au Hardcore
Join Date: Dec 2005
Location: QLD - Townsville
Posts: 1,772
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thanks, i was gonna get a set soon and now i shall be careful.
when you say harder pedal do you mean the brakes is more responsive ie it only takes a little touch and youve just broken all your bones? or just an improvement over the standard one?
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My Cars: 2002 Ford Falcon AU S3 SR 2006 BF MKI Falcon XR6 2008 Mazda BT50 SDX 2004 BA XR8 ute 2006 AUDI A4 B7 2013 FG II XR6 Ute 2006 Ford Territory TX 2003 Ford Falcon XR8 2009 Territory Turbo Ghia Current: 2012 Audi A4 B8 2.0T Quattro |
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#4 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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Rattle guns themselves do not cause the problem, but their use can lead to them warping, If the gun is calibrated to torque the wheel nuts to the correct tension or a tensioning device is used on the gun, the nuts will be done correctly.
It is possible to cause the problem just doing them up by hand if the recommended tension is exceded. Driving habits also lead to warped rotors.
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#5 | ||
Guest
Posts: n/a
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Id say driving habits will cause the most problem with rotor warping. Putting the car in neutral at the lights does a LOT to prevent the problem.
You'll find manual falcons don't have this problem as often as autos. |
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#6 | ||
Right out sideways
Join Date: Dec 2004
Location: Coffs Harbour NSW
Posts: 5,304
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i have had DBA slotted on the sedan, front and back since xmas, with the same pads and no warping thus far.
But i noticed a dramatic increase in braking ability, possibly because did the back too
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2010 FG XR50 Turbo | 2007 FPV BFII GT, BOSS 302 |
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#7 | ||
Just slidin'
Join Date: Sep 2005
Location: Brisvegas
Posts: 7,791
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I have slightly warped mine and they have only been on a few months, and about 6 thousand K's. I think it was a combination of doing a big run through the mountains when they were brand new, and washing my car one day when the brakes were still really hot. And probably from the rattle gun you mentioned as JAX do my wheels up with the rattle gun.
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MD Mondeo - For the family
NP Pajero - For the adventure |
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#8 | ||
XD197
Join Date: Sep 2006
Location: Riverton, WA
Posts: 498
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Rattle guns dont warp rotors, rubbing brakes or someone riding the brakes all the time will do it. Rattle guns break studs and crossthread them and leave them too tight to get off without a breaker bar, yay broken studs!!!
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#9 | |||
FF.Com.Au Hardcore
Join Date: Feb 2005
Posts: 805
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Some interesting observations I must say. Driving habits.........well, I replaced the original rotors predominately because they were 6 years old (1 machine left before being undersize) & had NEVER had warping issues (even with the same rattle gun/driving habits over 3 years since I rebuilt this AU) moreover, in the 5 years I've owned my EF, the fronts have only been machined ONCE, & this was when I needed to replace pads, not because of warping. My AU has done very little driving, is not driven hard & is exceptionally well maintained as is my EF both of which are driven solely by me, so I can only conclude that these DBA rotors are the issue, however I may switch to a softer pad as these could also be a contributing factor. In my earlier post I (wrongly) stated I was using Bendix "Ultimate" pads, they are in fact Bendix "Advance" pads, sorry if I misled anyone.
Quote:
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Removed by laminge Last edited by The Dok; 11-10-2006 at 03:09 PM. |
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#10 | ||
Regular Member
Join Date: May 2006
Location: perth
Posts: 106
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i also had a set of slotted dba's on my 99 fairlane with ultimate pads.
I went back to oem discs and the shudder and wobble was gone which i also fitted bosch pads. 1.I heard two stories:that heat builds up at the end of the slots causing hot spots. 2.ultimates need a lot of heat to work properly. As mine is a daily driver the pads weren't getting hot where as i check my slotted discs they were worn by .010" on each side after 6 months. So the new ones on now and i havent had a problem.
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www.theretrofitsource.com |
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#11 | ||
Regular Member
Join Date: Dec 2005
Posts: 95
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For more than 10 years my work car was always a Falcon wagon (mid 1990's to mid 2000's). Due to the distances I travelled the organisation probably turned them over at least every 12 months often earlier. (40,000km was the trigger distance for chage-over.) In that time I had plenty of experience with not very old discs warping and requiring machining.
And not due to riding the brake pedal or other bad driving habits I came to think it was just a normal new Ford thing. Funny but my ancient AU, bought two years ago, and now with around 250,000km on the clock does not show any indication of that problem. .
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. . Rob Ewart Bog standard silver BF Wagon, except for the Elvis doll ![]() Victorian Rock'n'Roll Dance Association www.VRRDA.com.au 2015 Victorian Rock'n'Roll Dance State Championships 23 May 2015, Furlan Club, Thornbury |
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#12 | ||
Walking with God
Join Date: Mar 2005
Location: Melbourne
Posts: 7,321
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Doing up the nuts really tight with a rattle gun would only affect the drum part of the disc being pushed harder against the hub wouldn't it?
How would that warp the actual disc surface, unless it's torqued unbelievably tight! My few ponderings! LOL! Cheers, GK
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#13 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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Yes it affects the drum part but apparantly this will cause run out in the rotor due to distortion from the drum part.
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#14 | ||
Regular Member
Join Date: Mar 2019
Posts: 50
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#15 | ||
Next upgraded Mk1 Leopard
![]() Join Date: Jan 2005
Location: Sydney, in the burbs
Posts: 4,908
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Mate he was a guest back in 2006 and it comes up with a invalid user name.
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Plastic Surgery 1 AUII Monsoon Blue How 2's: Change rear view mirror, Install backfire valve, Change foam front seats, Install auto transmission cooler, Replace Trans Shift Globe, Remove front door Trim, Paint AU headlights, install door spears, Premium Rear Parcel Shelf, go here...
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#16 | ||
FG XR6 Ute & Sedan
![]() Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 22,956
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See this thread and check out the links, if any, that still work (most don't after nearly 10 years) https://fordforums.com.au/showthread.php?t=11429164 "Warped Discs and Other Brake Myths"
Here's some links on the subject that still work: https://www.centricparts.com/media/t...c-8-2018_1.pdf https://www.motortrend.com/how-to/18...ed-rotor-myth/ https://www.crossdrilledrotors.ca/bl...the-right-way/ https://alconkits.com/blogs/brake-te...ed-brake-discs https://www.hellcat.org/threads/the-...optech.218717/ https://alconkits.com/blogs/news/the...d-brake-rotors https://ipgparts.com/blogs/blog/stop...ny-brake-myths
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regards Blue Last edited by aussiblue; 25-11-2023 at 01:32 PM. |
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#17 | ||
Regular Member
Join Date: May 2009
Posts: 58
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#18 | |||
Regular Member
Join Date: Sep 2018
Posts: 424
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Quote:
If your brakes are getting hot enough to warp between street lights, there's got to be something else going on. I decided to check my own brake rotors with a thermal camera after a 40-minute drive (highway followed by town driving) one day and they were no hotter than 70°c, and even then, that was from the internal vanes of the rotor. Turns out that ventilated brakes are actually really efficient at transferring heat away from the friction surface. |
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#19 | ||
XR6T BA 2002
Join Date: Apr 2011
Posts: 681
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Installing new discs on old rusty hubs will warp discs everytime
Cleaning them with a wire wheel prior can still cause high and lows Repalce hubs and discs at the same time
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XR6T 2002 BA
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