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Post by ishaqmir on Sept 6, 2016 10:25:59 GMT 1
It's an auto, and for the first few hundred miles I'd always avoid using hand brake and foot brake when stationary, I'd just put it into park. But STILL getting the problem. Wheels not warm at all to touch. But front discs always warmer than the rears, is that normal? Front brakes are a lot bigger than the rears though. yes, the front refurbed are silver but now with a very slight tinge of yellow compared to the rears which are immaculate. Also, not much chipping to powder coat around Centre cap on the rears, only the front wheels.
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rpm
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Post by rpm on Sept 6, 2016 11:29:29 GMT 1
Ok I just had a chat with a reputable BMW independent in Solihull and he is saying that he had a similar case a few years back with an M5, everything was replaced, callipers, hubs, discs pads control arms etc but problem kept coming back. He said the problem was his refurbished front alloy wheels that were not powder coated correctly and heat was transferring to the discs. Now, the seller I bought the car from did refurbish all the alloys and the fronts look as though it wasn't a good job as the powder coat is cracking and chipping/corroding around the centre caps on both front wheels. Any advice? But i guess first thing is getting those hubs checked for run out... As joepublic said, wheels dont cause heat, they absorb and dissipate it. As long as clean faces of wheels and hubs, then that isnt the cause of your problems, no matter how reputable that garage is. A bent or out of true wheel could cause issues, but would be immediate, not after 500 miles! Easy test, swap front to back wheels . Front brakes work harder and get hotter than the rears. But you implied before that 1 front disc is noticeably hotter than the other. If so that is where the investigation is needed
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rpm
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Post by rpm on Sept 6, 2016 11:30:43 GMT 1
Hi everyone new here, hoping to get some help with this on-going problem, which i've researched into A LOT on the internet but still no luck. Ok, I bought my BMW 730ld 2011 reg (53k genuine on clock) this April 2016. the brake judder was present at time of sale and the seller said that he had replaced the front discs and pads 01/2016 from local mechanic but with genuine BMW parts. I still bought the car as thought I could spend some money and get it sorted. So I then took it to my trusted local mechanic and he had a good look and said the front discs and pads needed changing and possibly one calliper just needing some service as may be ceased. He fitted genuine Brembo discs and pads, total cost me like £550!! All the judder had gone away after they were fitted, so led me to believe it was indeed the front discs and pads. Just one month later (500-1000 miles) the same problem returned. This time i took it to BMW dealer for a diagnostic and they said the front control arms needed replacing as they were vibrating on the discs and causing premature wear/tear. So i paid £600 just for the pair of control arms from BMW and my local mechanic fitted them and also replaced the Bremdo discs and pads under warranty. Problem went away again and car drove immaculately. Until.....another 6 weeks (500-1000 miles) and EXACT same problem AGAIN!!! So took it to my local mechanic again and he has replaced the front brembo discs and pads again under warranty but also did a thorough check on other parts and said everything was fine. He put the car on the MOT wheel rollers too and checked the front brakes and said callipers were working perfectly and that I shouldn't change them. I picked up the car yesterday and is driving fine so far (only covered 70 miles), but i'm dreading the same problem returning after a few weeks. My local mechanic has told me to just brake gently for 500 miles, which I have always done after each replacement anyway. He said if the problem returns again he will either send my car to a friend who is technician at BMW or just try a completely different brand of discs/pads like ATEC? (i think that was the name he used). Yesterday after driving for about 30 mins with just gentle braking, I got out and touched the front discs to see if one was hotter than the other. Neither of them were 'hot', they were just 'warm' and the driver side seemed to be just slightly warmer. I ran this test again later on and found the same, discs just warm, with driver side slightly warmer. any help would be much appreciated as the car drives beautifully otherwise but let down by the brakes. Thanks
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Post by ishaqmir on Sept 6, 2016 13:05:46 GMT 1
Thanks for the replies.
I was contemplating swapping rears to fronts a while back but the sizes are different, rears are 275 and fronts are 245 I think. Will this be safe to do and cause no damage to the car? Obviously all are 20" though.
Thanks
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Deleted
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Post by Deleted on Sept 6, 2016 23:17:53 GMT 1
I find ECP quality no worse than anywhere else. Customer service is always consistently good. Always agreeable to resolving problems. Fairer on prices than the other big chain is with me. One local indy collects all his stuff from them then adds £10 to a £2 item !
The OP having his full axle set swapped out twice under warranty speaks for itself really. I personally wouldn't expect that result from other suppliers.
Must admit, outside of service parts, I never buy new parts anyway.
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Post by valhalla on Sept 7, 2016 0:17:57 GMT 1
I'd go with all the comments about checking for run-out figures, both before and after the problem manifests itself. I would have expected the garage that was removing the first set of components to have measured for run-out figures on both inboard and outboard faces on both front discs. To be abolutely sure, I would have also checked the thickness of the disc over several points to ensure the ventilation slots are not relieving under higher temperatures. I've seen big issues with poor-quality discs on Discovery2 like this, always fixed it with Brembo kits.
All discs come with explicit instructions regarding measuring hub run-out before any new disc is put onto the car; was this done at any time? What are the wheel bearings like, have they been hammered by aftermarket alloys on strange offsets?
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Post by Noberator on Sept 7, 2016 0:39:59 GMT 1
Thanks for the replies. I was contemplating swapping rears to fronts a while back but the sizes are different, Will this be safe to do and cause no damage to the car? Obviously all are 20" though. Thanks May be that is the problem. The fronts should be 348mm and the rears should be 345mm vented discs with a minimum thickness of both vented. So double check the thickness sizes for the front ones and check if your sizes are incorrect then that could well be why you are going through discs after a short period because they aren't big enough for the 730D which is a big heavy car. Go and double check with your local BMW Dealer what size they should be.
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Post by Joepublic on Sept 7, 2016 7:34:11 GMT 1
Thanks for the replies. I was contemplating swapping rears to fronts a while back but the sizes are different, Will this be safe to do and cause no damage to the car? Obviously all are 20" though. Thanks May be that is the problem. The fronts should be 348mm and the rears should be 345mm vented discs with a minimum thickness of both vented. So double check the thickness sizes for the front ones and check if your sizes are incorrect then that could well be why you are going through discs after a short period because they aren't big enough for the 730D which is a big heavy car. Go and double check with your local BMW Dealer what size they should be. Those are his tyre sizes lol
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rpm
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Post by rpm on Sept 7, 2016 10:13:44 GMT 1
Get a garage that knows how to check temperatures of your discs, calipers, wheels etc after its been for a drive, and then get a check on hub runouts.
I wouldnt swap those wheels front to back with such a size difference.
Until somebody has that information you will just be going round in circles. As you have been doing since you have had the car.
Lots of parts thrown ai it but no base information found
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Post by ishaqmir on Sept 7, 2016 12:56:35 GMT 1
Hmmm I think that's the most sensible route now. But problem is finding a garage that will do all of this in Birmingham. Not going to the dealer, they are bunch of noobs
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Post by rhyds on Sept 7, 2016 13:02:26 GMT 1
Hmmm I think that's the most sensible route now. But problem is finding a garage that will do all of this in Birmingham. Not going to the dealer, they are bunch of noobs This kind of mechanical work is within the scope of most decent garages.
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Post by Noberator on Sept 7, 2016 13:35:46 GMT 1
May be that is the problem. The fronts should be 348mm and the rears should be 345mm vented discs with a minimum thickness of both vented. So double check the thickness sizes for the front ones and check if your sizes are incorrect then that could well be why you are going through discs after a short period because they aren't big enough for the 730D which is a big heavy car. Go and double check with your local BMW Dealer what size they should be. Those are his tyre sizes lol What a plonker. That's what sleep deprivation does for you. Are the tyres round rubber ones. As you where.
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