Vibration when braking at high speeds

qa15ar · 07-12-2013, 03:59 AM

Hi Guys,

Just looking for some pointers, basically steering wheel shakes when you brake at high speeds, had no work what so ever done on the brakes recently, only thing had done recently was a couple new front tyres, although i did hit a speedbump pretty hard a couple of weeks ago but since then had the wheel rebalanced but still no fix.

Any ideas? I guess I have broke something?

gIzzE · 07-12-2013, 05:28 AM

Knackered lower ball joint is the usual suspect.

May need to get that swapped out? Better to do the pair if the car is 3 years or older.

CustomColours · 07-12-2013, 05:45 AM

Actually. Vibration under braking at speed is normally down to warped brake disks.

lolololol · 07-12-2013, 05:46 AM

Defo warped discs - had loads personally.

gIzzE · 07-12-2013, 05:59 AM

Yeah it is, but I read that as he knew it was not the brakes. Don't know why reading it back.

Kerr · 07-12-2013, 06:13 AM

Poor wheel balancing and buckled wheels can show up through the steering under braking too.

CustomColours · 07-12-2013, 06:26 AM

This is also true. I would look at the brake disks firat mate. Iv had it a few times with customers cars.

I knew it may be disks the second I read the title.

And as the wheels have been rebalanced aswell it doesnt leave allot else for it ti be.

qa15ar · 07-12-2013, 06:47 AM

thanks for all the replies guys, will have a look at the weekend, hope its not the discs as they are pretty good nick :-(

lolololol · 07-12-2013, 02:03 PM

^ not if there warped mate !

Alex.J · 07-12-2013, 02:23 PM

Warped discs is very very rare.

People say 'oo i have warped discs' in actual fact, its pad transfer, which, is very very common and hugely mis-diagnosed as warped discs.

To warp a disc you need to exceed normal operating temps by up to 5times, dont know about you, but not sure how many people do 100-0 stops daily?

Probably pad transfer mate!

ps. If it was warped it would do it all the time not just at high speed

anielsen71 · 07-12-2013, 02:36 PM

@Alex.J
If thats the case, how do you get rid of pad transfer?

And I have had warped discs without breaking as you explain. On almost new OEM discs. I took them to a brake specialist and he made them as "unwarped" as possible in a machine made specially for treating brake discs. It didn't last though and I'm getting new discs and pads next week.

GoRomeo · 07-12-2013, 02:40 PM

Quote:

Originally Posted by Alex.J

Warped discs is very very rare.

People say 'oo i have warped discs' in actual fact, its pad transfer, which, is very very common and hugely mis-diagnosed as warped discs.

To warp a disc you need to exceed normal operating temps by up to 5times, dont know about you, but not sure how many people do 100-0 stops daily?

Probably pad transfer mate!

ps. If it was warped it would do it all the time not just at high speed

Not necesesarly, It can also be uneven brake pad wear due to warped rotors.

Alex.J · 07-12-2013, 02:47 PM

Quote:

Originally Posted by anielsen71

@Alex.J
If thats the case, how do you get rid of pad transfer?

And I have had warped discs without breaking as you explain. On almost new OEM discs. I took them to a brake specialist and he made them as "unwarped" as possible in a machine made specially for treating brake discs. It didn't last though and I'm getting new discs and pads next week.

If they are new discs, it is usual due to incorrect bedding in process, which require the discs to go through a certain amount of heat cycles before it is fully ready for a hammering, possibly your issue?

Yeah obviously warping is possible, but its very very rare.

You can true a disc up on a lathe or milling machine pretty accurately.

Alex.J · 07-12-2013, 02:49 PM

See here: not from me a metalurgist ( Materials engineer, who knos a fair bit about this.)

http://www.stoptech.com/technical-su...nd-other-myths

anielsen71 · 07-12-2013, 03:02 PM

@Alex
It might be wrong bedding. I didn't treat them special in the begining. I drive alot of highway driving and not så much city driving with lot of breaking.
but when I brake o nthe highway it sometimes is hard braking... :-|
A milling machine!! I didn't know the word in english :-) but yes thats the thing :-)
Thnx for the link :-)

moorlander · 07-12-2013, 03:08 PM

I'm willing to bet it's your rotors. I've had this problem at least a half a dozen times and it's always been the rotors.

Alex.J · 07-12-2013, 03:42 PM

It will be the rotors, no doubt, but it wont be a warped disc, it will be pad transfer.

Josh1a1h · 07-12-2013, 04:58 PM

do you get any clonking at low speeds.

I have warped discs as a result of a knackered control arm bushing

Alex.J · 07-12-2013, 06:50 PM

Quote:

Originally Posted by Josh1a1h

do you get any clonking at low speeds.

I have warped discs as a result of a knackered control arm bushing

It won't be a warped disc..

CustomColours · 07-12-2013, 10:36 PM

Warped disks arent rare. Iv worked in two bmw garages and a mercedes garage and most cases of warped disks are people heavily braking on motorway exit lanes then sitting at a set of lights using the foot brake. Although its normally the spirited drivers that get that problem.

Subzero2003 · 07-13-2013, 05:43 AM

Out of interest, what make are your discs and pads?

07-12-2013, 03:59 AM	#1
qa15ar Private First Class 10 Rep 141 Posts Drives: F30 330d M-Sport Join Date: Dec 2012 Location: London iTrader: (0)	Vibration when braking at high speeds Hi Guys, Just looking for some pointers, basically steering wheel shakes when you brake at high speeds, had no work what so ever done on the brakes recently, only thing had done recently was a couple new front tyres, although i did hit a speedbump pretty hard a couple of weeks ago but since then had the wheel rebalanced but still no fix. Any ideas? I guess I have broke something?
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07-12-2013, 05:28 AM	#2
gIzzE Major General 361 Rep 5,985 Posts Drives: F11 + 997 Carrera S Join Date: Apr 2006 Location: Norfolk, UK. iTrader: (2)	Knackered lower ball joint is the usual suspect. May need to get that swapped out? Better to do the pair if the car is 3 years or older.
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07-12-2013, 05:45 AM	#3
CustomColours Banned 16 Rep 791 Posts Drives: 335i SE Join Date: Apr 2012 Location: Hertfordshire iTrader: (0)	Actually. Vibration under braking at speed is normally down to warped brake disks.
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07-12-2013, 05:46 AM	#4
lolololol Colonel 101 Rep 2,204 Posts Drives: M4 F83 Join Date: Mar 2009 Location: The world iTrader: (4)	Defo warped discs - had loads personally. __________________ Engine Mods: VF HEX Stage 2, ER Charge Pipes, VRSF Catless Downpipes, BMS Intakes and PCW Exhaust Mod Running Gear Mods: HRE Flow Form F01, Yellow Stuff pads. Cosmetic: Performance Grill, Lip Spoiler, Splitters, Side Skirt Extensions, Diffuser and BMS Tips
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07-12-2013, 05:59 AM	#5
gIzzE Major General 361 Rep 5,985 Posts Drives: F11 + 997 Carrera S Join Date: Apr 2006 Location: Norfolk, UK. iTrader: (2)	Yeah it is, but I read that as he knew it was not the brakes. Don't know why reading it back.
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07-12-2013, 06:13 AM	#6
Kerr Brigadier General 114 Rep 4,021 Posts Drives: BMW M235I Join Date: Dec 2010 Location: Aberdeen iTrader: (0)	Poor wheel balancing and buckled wheels can show up through the steering under braking too.
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07-12-2013, 06:26 AM	#7
CustomColours Banned 16 Rep 791 Posts Drives: 335i SE Join Date: Apr 2012 Location: Hertfordshire iTrader: (0)	This is also true. I would look at the brake disks firat mate. Iv had it a few times with customers cars. I knew it may be disks the second I read the title. And as the wheels have been rebalanced aswell it doesnt leave allot else for it ti be.
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07-12-2013, 06:47 AM	#8
qa15ar Private First Class 10 Rep 141 Posts Drives: F30 330d M-Sport Join Date: Dec 2012 Location: London iTrader: (0)	thanks for all the replies guys, will have a look at the weekend, hope its not the discs as they are pretty good nick :-(
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07-12-2013, 02:03 PM	#9
lolololol Colonel 101 Rep 2,204 Posts Drives: M4 F83 Join Date: Mar 2009 Location: The world iTrader: (4)	^ not if there warped mate ! __________________ Engine Mods: VF HEX Stage 2, ER Charge Pipes, VRSF Catless Downpipes, BMS Intakes and PCW Exhaust Mod Running Gear Mods: HRE Flow Form F01, Yellow Stuff pads. Cosmetic: Performance Grill, Lip Spoiler, Splitters, Side Skirt Extensions, Diffuser and BMS Tips
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07-12-2013, 02:23 PM	#10
Alex.J Major 57 Rep 1,241 Posts Drives: BMW E92 335i MSport Join Date: May 2013 Location: Nottingham iTrader: (9)	Warped discs is very very rare. People say 'oo i have warped discs' in actual fact, its pad transfer, which, is very very common and hugely mis-diagnosed as warped discs. To warp a disc you need to exceed normal operating temps by up to 5times, dont know about you, but not sure how many people do 100-0 stops daily? Probably pad transfer mate! ps. If it was warped it would do it all the time not just at high speed
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07-12-2013, 02:36 PM	#11
anielsen71 Lieutenant Colonel 617 Rep 1,523 Posts Drives: F36 435xd Join Date: Mar 2012 Location: Behind the wheel iTrader: (0) Garage List 2015 BMW F36 435d [8.67]	@Alex.J If thats the case, how do you get rid of pad transfer? And I have had warped discs without breaking as you explain. On almost new OEM discs. I took them to a brake specialist and he made them as "unwarped" as possible in a machine made specially for treating brake discs. It didn't last though and I'm getting new discs and pads next week. __________________ Brgds Allan ‘15 F36 435xd Gran Coupé Ex: E46 330d, E91 330dA
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07-12-2013, 02:49 PM	#14
Alex.J Major 57 Rep 1,241 Posts Drives: BMW E92 335i MSport Join Date: May 2013 Location: Nottingham iTrader: (9)	See here: not from me a metalurgist ( Materials engineer, who knos a fair bit about this.) http://www.stoptech.com/technical-su...nd-other-myths
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07-12-2013, 03:02 PM	#15
anielsen71 Lieutenant Colonel 617 Rep 1,523 Posts Drives: F36 435xd Join Date: Mar 2012 Location: Behind the wheel iTrader: (0) Garage List 2015 BMW F36 435d [8.67]	@Alex It might be wrong bedding. I didn't treat them special in the begining. I drive alot of highway driving and not så much city driving with lot of breaking. but when I brake o nthe highway it sometimes is hard braking... :-\| A milling machine!! I didn't know the word in english :-) but yes thats the thing :-) Thnx for the link :-) __________________ Brgds Allan ‘15 F36 435xd Gran Coupé Ex: E46 330d, E91 330dA
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07-12-2013, 03:08 PM	#16
moorlander Private First Class 11 Rep 164 Posts Drives: 2024 x5, 2024 x3 on order Join Date: Feb 2013 Location: the moorlands iTrader: (0)	I'm willing to bet it's your rotors. I've had this problem at least a half a dozen times and it's always been the rotors.
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07-12-2013, 03:42 PM	#17
Alex.J Major 57 Rep 1,241 Posts Drives: BMW E92 335i MSport Join Date: May 2013 Location: Nottingham iTrader: (9)	It will be the rotors, no doubt, but it wont be a warped disc, it will be pad transfer.
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07-12-2013, 04:58 PM	#18
Josh1a1h Banned 178 Rep 3,828 Posts Drives: AzuriteBlack 335i E92 Join Date: Aug 2011 Location: Central North to West London iTrader: (2)	do you get any clonking at low speeds. I have warped discs as a result of a knackered control arm bushing
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07-12-2013, 10:36 PM	#20
CustomColours Banned 16 Rep 791 Posts Drives: 335i SE Join Date: Apr 2012 Location: Hertfordshire iTrader: (0)	Warped disks arent rare. Iv worked in two bmw garages and a mercedes garage and most cases of warped disks are people heavily braking on motorway exit lanes then sitting at a set of lights using the foot brake. Although its normally the spirited drivers that get that problem.
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07-13-2013, 05:43 AM	#21
Subzero2003 Captain 20 Rep 668 Posts Drives: E92 335i Join Date: Apr 2011 Location: UK iTrader: (0)	Out of interest, what make are your discs and pads?
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