discs keep warping!
Discussion
gcpeters said:
had a brand new set of discs fitted
1000 miles one and warped - took back to peninsula they skimmed etc, all sorted, 600 miles warped again!
any ideas??? i have rang peninsula and they are going to take a look, faulty discs from the factory??
GP
1000 miles one and warped - took back to peninsula they skimmed etc, all sorted, 600 miles warped again!
any ideas??? i have rang peninsula and they are going to take a look, faulty discs from the factory??
GP
Dude, Discs don't warp in my experience.
To clear the problem do the following:
Drive to 30mph and then do a smooth emeregency stop. Drive to 30mph and do an agressive emergency stop.
Repeat but with speeds of 60mph instead of 30mph.
You need to be very firm with the pedal and push through the vibration you're getting.
repeat the 60 mph bit until the vibrations go away.
This has always worked for me.
I will dig out the info I have on the myth of disc warp
. Duncan
One of your callipers may be binding ever so slightly, and apart from heating the disc up more than normal, will cause it to dissipate that heat back through the pad surface when you stop causing it to warp. One the other hand a new disc can be prone to warp due to maunfacturing irregularities, just happens from time to time.
Many think that warping doesn't exist, that it is a build up of residue from the brake pads on the discs.
The solution is the carefully remove the residue with light sanding. I tried this and it didn't work for me.
I then tried having the discs skimmed. That lasted all for two days.
I had the discs replaced at TVRPower in the end. Dom at Power thinks it's to do with the memory of casting. Years ago the casting would be left to stand for ages before machining, so they would settle first. These days that are machined shortly after casting and as a result some discs haven't stablised.
Even after a re-machining, the warped disc once hot will just warp in the direction it had previously.
I understand the solution is to bin the discs and get them to fit new one's. It's not going to kill them as they're about £240 plus vat for a front drilled set.
That my 2p anyway.
John
The solution is the carefully remove the residue with light sanding. I tried this and it didn't work for me.
I then tried having the discs skimmed. That lasted all for two days.
I had the discs replaced at TVRPower in the end.
Dom at Power thinks it's to do with the memory of casting. Years ago the casting would be left to stand for ages before machining, so they would settle first. These days that are machined shortly after casting and as a result some discs haven't stablised. Even after a re-machining, the warped disc once hot will just warp in the direction it had previously.
I understand the solution is to bin the discs and get them to fit new one's. It's not going to kill them as they're about £240 plus vat for a front drilled set.
That my 2p anyway.
John
My method has never failed me!
What you're trying to get is an even distribution of pad material onto the surface of the disc rather than the hot spots which build up in town driving (hot pads pressed to disc at roundabouts etc).
Seriously woth a go and pretty cheap at £0 too.
Duncan
What you're trying to get is an even distribution of pad material onto the surface of the disc rather than the hot spots which build up in town driving (hot pads pressed to disc at roundabouts etc).
Seriously woth a go and pretty cheap at £0 too
. Duncan
Many think that warping doesn't exist, that it is a build up of residue from the brake pads on the discs.
The solution is the carefully remove the residue with light sanding. I tried this and it didn't work for me.
I then tried having the discs skimmed. That lasted all for two days.
I had the discs replaced at TVRPower in the end. Dom at Power thinks it's to do with the memory of casting. Years ago the casting would be left to stand for ages before machining, so they would settle first. These days that are machined shortly after casting and as a result some discs haven't stablised.
Even after a re-machining, the warped disc once hot will just warp in the direction it had previously.
I understand the solution is to bin the discs and get them to fit new one's. It's not going to kill them as they're about £240 plus vat for a front drilled set.
That my 2p anyway.
John
The solution is the carefully remove the residue with light sanding. I tried this and it didn't work for me.
I then tried having the discs skimmed. That lasted all for two days.
I had the discs replaced at TVRPower in the end.
Dom at Power thinks it's to do with the memory of casting. Years ago the casting would be left to stand for ages before machining, so they would settle first. These days that are machined shortly after casting and as a result some discs haven't stablised. Even after a re-machining, the warped disc once hot will just warp in the direction it had previously.
I understand the solution is to bin the discs and get them to fit new one's. It's not going to kill them as they're about £240 plus vat for a front drilled set.
That my 2p anyway.
John
DuncanM said:
nick cooper said:
As we are on the subject mine seem to be warped intermitentley? sometimes really bad and gets me thinking about a new set of discs then seem ok, think i'll try the free fix to see if it works, any ideas?
Why not try my FOC method above?
i use the foc method about every 3 months or so. never fails. 
. I put a brand new set of disks on last year and warped the fronts shortly after. When i had them skimmed the engineer pointed out that the pads were fractionally too large for the disks ie the pads overlapped the outer edge of the disk. as the pads wore it left a ridge on top the the pads which rubs on the top/outer edge of the disk causing it to overheat and warp. Apparently it was quite common in the mini race cars.
i had the disks skimmed and then I filed back the top edge of the pads and since then 1 track day and various sprints and they have been fine.
i had the disks skimmed and then I filed back the top edge of the pads and since then 1 track day and various sprints and they have been fine.
DuncanM said:
I used to work as a mechanic years ago in a ford dealership and we must have changed hundreds of discs and pads for brake judder after reading that i wonder how much money was wasted. Going to try this next time i get cerb out to play, if it works i'll be well chuffed as i'm getting a bit tired of throwing money at it, cheers for that one duncan. Will let you know the result.
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