Progression from the E61 M5 braking vibration issue.
Discussion
Following the discussion on the following toipic:
http://www.pistonheads.com/gassing/topic.asp?h=0&a... / 61 M5 high speed brake vibration.
Did some research today on the cars previous repair history and came across this:
New N/S/F shocker due to vibration under braking around 60mph, and was found to be leaking under investigation - June 2010.
Both Lower front control arms replaced due to wear - October 2010.
Could this be a recurring issue or suspect repair? The car is booked in to BMW next wed and is going for an inspection on saturday at my local BMW specialist as a pre warning / assesment.
The trouble is that because the shocker was replaced under manufacturer warranty it wont be covered by parts warranty as the manufacturer warranty ran out in the summer. The 2 year parts cover only applies when the repair is done after the cars 36 month point. Lower control arms will obviously be covered by parts warranty. My own BMW Insured Warranty wont cover it either as ive not owned the car for more than 30 days. Poo! Here's hoping its a cheap fix.
http://www.pistonheads.com/gassing/topic.asp?h=0&a... / 61 M5 high speed brake vibration.
Did some research today on the cars previous repair history and came across this:
New N/S/F shocker due to vibration under braking around 60mph, and was found to be leaking under investigation - June 2010.
Both Lower front control arms replaced due to wear - October 2010.
Could this be a recurring issue or suspect repair? The car is booked in to BMW next wed and is going for an inspection on saturday at my local BMW specialist as a pre warning / assesment.
The trouble is that because the shocker was replaced under manufacturer warranty it wont be covered by parts warranty as the manufacturer warranty ran out in the summer. The 2 year parts cover only applies when the repair is done after the cars 36 month point. Lower control arms will obviously be covered by parts warranty. My own BMW Insured Warranty wont cover it either as ive not owned the car for more than 30 days. Poo! Here's hoping its a cheap fix.
Toilet Duck said:
ecain63 said:
My own BMW Insured Warranty wont cover it either as ive not owned the car for more than 30 days.
So why didn't you wait 30 days until you booked it in?ecain63 said:
Toilet Duck said:
ecain63 said:
My own BMW Insured Warranty wont cover it either as ive not owned the car for more than 30 days.
So why didn't you wait 30 days until you booked it in?Toilet Duck said:
ecain63 said:
Toilet Duck said:
ecain63 said:
My own BMW Insured Warranty wont cover it either as ive not owned the car for more than 30 days.
So why didn't you wait 30 days until you booked it in?I had a nightmare with my E39 and replaced the reaction bushes which helped but it didnt go away. I also tried to re-bed the dics but that didnt work either. The specialist who fitted the new discs and pads tried to make out it was buckled alloys. In the end i went to the main dealer who supplied the discs and they were warped. hey had done around 5K and now that they have been replaced they are spot on. I would get the discs checked before you spend any more time or money.
Been round to my local specailist this morning and it seems the discs are getting a bit out of balance above 70mph when they are hot. It didnt show any signs of vibration on the first 110mph test run (which was amusing), but on the second and third runs the vibration increased.
A there was no sign of wear or play on any bushes, arms or joints the tech suggested that the discs get a skimming on a lathe to flatten them off now they have been worn in a little. I guess we'll see what happens on thursday when its done. He did say that it was quite common for the factory fresh discs to still have tension in them from manufacturing which only manifests itself when they are hot. They should be cooked after milling to release this tension and then reskimmed but it doesnt always do the job. When the discs get hot they bulge a little in spots that result in a 'warped disc' feel that isnt actually warping.
A there was no sign of wear or play on any bushes, arms or joints the tech suggested that the discs get a skimming on a lathe to flatten them off now they have been worn in a little. I guess we'll see what happens on thursday when its done. He did say that it was quite common for the factory fresh discs to still have tension in them from manufacturing which only manifests itself when they are hot. They should be cooked after milling to release this tension and then reskimmed but it doesnt always do the job. When the discs get hot they bulge a little in spots that result in a 'warped disc' feel that isnt actually warping.
I've always been of the opinion that it's impossible to 'warp' a disc. However, given what CB has said above, combined with a similar assessment from the M5Board and my own specialist, I'm perhaps more inclined to think that the brake shudder I'm getting (only below 60mph) is perhaps an issue with the discs.
He did say that it was nigh on impossible to warp an M5 disc (a good one thats not already warped from manufacture) unless your doing some serious continuous braking (think castle combe at max chat on a dry day) followed by instant application of the handbrake and footbrake for an extended period. He also said that the brake fluid will already have been boiled and killed doing that so you wouldnt even get close to warping temp on standard fluid. The issue is that the manufacturers dont always produce the best discs and whilst the issue would eventually rectify itself through normal wear, its not something that lends itself well to confident high speed driving. I could go back to BMW with the discs and claim they were faulty but as they were replaced before i owned it i could not prove that the discs were correctly run in by the last owner. We'll see what a skim produces.
Took the car in this morning to get the discs looked at. The result was that one of the discs was warped (only a minor warp) caused by misaligned pads on the last fitment (1 month ago). Normally any high spots can be skimmed off (within reason) but in the case of my front right disc it had a low point instead of a high one. There was also a sign of possible fracture between two of the holes caused by sudden high temps in that particular low point. The pads being brand new just needed flattening off and refitting correectly. They have a bit less life in them but not that much less. Now i just have to wait for the new discs to arrive.
The good (though more costly than i first thought) thing is that im needing 4 front discs to make some wall clocks for a friends new house build. My now redundant discs have already been ear-marked for use in the project, but i need 2 more. Anyone got any knocking around?
Eddie
The good (though more costly than i first thought) thing is that im needing 4 front discs to make some wall clocks for a friends new house build. My now redundant discs have already been ear-marked for use in the project, but i need 2 more. Anyone got any knocking around?
Eddie
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