I have read a number of posts on warped disks, or more to the point some of you guys believe that its not a warped disk but more build up on the disk that causes judders through the steering wheel with gentle breaking..
Ive been to the garage and they have said this is rubbish.. and said ill need new front disks or rotors as u guys call them..
If my disks are not warped is there are fix without buying new disks?
Any help would be great..
ps i have recently fitted new OE front pads
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Its not the pace of life that concerns me.. its the sudden stop at the end!
I have read a number of posts on warped disks, or more to the point some of you guys believe that its not a warped disk but more build up on the disk that causes judders through the steering wheel with gentle breaking..
Ive been to the garage and they have said this is rubbish.. and said ill need new front disks or rotors as u guys call them..
Its not rubbish. Not all pedal pulsation is due to warped discs. One reason is brake pad material operating outside of its designed temperature range and it has left a thicker than normal deposit in one area of the disc surface, creating a "sticky" spot that will grab with every revolution of the disc. Another source may be grease or other foreign materials, usually deposited on the disc during wheel maintenance, can likewise create a slippery spot on the disc, also creating the sensation of a grab or warped brake disc. You mentioned you recently had oem pads installed...
Might want to get a second opinion before shelling out $$ for new disks.
I second that - don't shell out money before you are sure.
Here is a great article you can read, I encourage you to look through the StopTech's website, especially their White Paper section. Here they dispell the myth of warped discs. Also, you can search through Dave Z.'s website, a lot of great info there...
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I have read a number of posts on warped disks, or more to the point some of you guys believe that its not a warped disk but more build up on the disk that causes judders through the steering wheel with gentle breaking..
Ive been to the garage and they have said this is rubbish.. and said ill need new front disks or rotors as u guys call them..
If my disks are not warped is there are fix without buying new disks?
Any help would be great..
ps i have recently fitted new OE front pads
I have a similar problem. What did you find out and how was it fixed?
I have read a number of posts on warped disks, or more to the point some of you guys believe that its not a warped disk but more build up on the disk that causes judders through the steering wheel with gentle breaking..
Ive been to the garage and they have said this is rubbish.. and said ill need new front disks or rotors as u guys call them..
If my disks are not warped is there are fix without buying new disks?
Any help would be great..
ps i have recently fitted new OE front pads
Check the thrust arm bushings. Classic for judder on gentle braking. And check the ball joints while you are there.
Regards,
Jerry
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Hi Guys, thanks for the responses, that article is very informative but i can not see where it says how to cure the problem of pad material deposits on disks...
I have just had a major service completed on her and they say they check all the ball joints and bushes.. they found the rear antiroll bar brackets were broken and missing so im inclined to belive them.
Also had two rear pirelli pzero rossos fitted yesterday, christ what a difference to traction and they are not even scrubbed in yet! Had them fitted before to a 350z i had and they were good on that but the M5 seems to love them!!
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Its not the pace of life that concerns me.. its the sudden stop at the end!
Myth # 1 – BRAKE JUDDER AND VIBRATION IS CAUSED BY DISCS THAT HAVE BEEN WARPED FROM EXESSIVE HEAT.
The term "warped brake disc" has been in common use in motor racing for decades. When a driver reports a vibration under hard braking, inexperienced crews, after checking for (and not finding) cracks often attribute the vibration to "warped discs". They then measure the disc thickness in various places, find significant variation and the diagnosis is cast in stone.
When disc brakes for high performance cars arrived on the scene we began to hear of "warped brake discs" on road going cars, with the same analyses and diagnoses. Typically, the discs are resurfaced to cure the problem and, equally typically, after a relatively short time the roughness or vibration comes back. Brake roughness has caused a significant number of cars to be bought back by their manufacturers under the "lemon laws". This has been going on for decades now - and, like most things that we have cast in stone, the diagnoses are wrong.
With one qualifier, presuming that the hub and wheel flange are flat and in good condition and that the wheel bolts or hat mounting hardware is in good condition, installed correctly and tightened uniformly and in the correct order to the recommended torque specification, in more than 40 years of professional racing, including the Shelby/Ford GT 40s – one of the most intense brake development program in history - I have never seen a warped brake disc. I have seen lots of cracked discs, discs that had turned into shallow cones at operating temperature because they were mounted rigidly to their attachment bells or top hats, a few where the friction surface had collapsed in the area between straight radial interior vanes, and an untold number of discs with pad material unevenly deposited on the friction surfaces - sometimes visible and more often not.
In fact every case of "warped brake disc" that I have investigated, whether on a racing car or a street car, has turned out to be friction pad material transferred unevenly to the surface of the disc. This uneven deposition results in thickness variation (TV) or run-out due to hot spotting that occurred at elevated temperatures.
here's an interesting read
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Yeah this is the same article that is linked above.. i think.. it explains the issue with hard braking and does not say how to remove the build up of friction material..
should i get the disks lightly skimmed? or is there a less drastic fix..
It seems to me that it doesnt matter what we call it warped disks or build up of friction material i appear to be facing the same bill for a set of new front disks!
__________________
Its not the pace of life that concerns me.. its the sudden stop at the end!
try some more abrasive pads for a stint other than the stock pads ?
dave Zeckhausen will advise you if you pop him a mail
remember Jons pagids < yellows ? ..> ... they cleaned the discs but were much more agrresive on the surface ..
the stoptech site gives you a number of options if you mooch thru it ..
Linear Mode
