faulty brake discs
Discussion
I picked up a set of Pagid front discs (and pads) for my 1 series yesterday from ECP and after fitting them noticed the brake pedal was pulsing - checked they were flat on the hub but noticed one was binding against the pads at a certain point when I rotated it. Picked up a new set today (will return faulty disc next week for refund), and whilst they are happy to refund the chap said it was extremely rare to get a dodgy disc - just wondered how true this is, and what causes a disc to be "warped" out of the box (given they will all be machined to the same standard)?
On another topic, my front run flats are wearing on the outside edge (seems like a common problem with BMW RF) but still have around 4mm over what I think will be 75% of the tyre - I really want to eek out some more miles from them before I change to non-RF but not if this is going to significantly alter their performance. Thoughts?
cheers.
On another topic, my front run flats are wearing on the outside edge (seems like a common problem with BMW RF) but still have around 4mm over what I think will be 75% of the tyre - I really want to eek out some more miles from them before I change to non-RF but not if this is going to significantly alter their performance. Thoughts?
cheers.
P I Staker said:
Not cleaning up the hub face properly is probably what has caused your discs to feel warped out the box.
I checked the hubs were clean before I put them on, and then when I realised there was a problem double checked this and they looked fine - new disc on this afternoon and it now feels perfect so pretty sure it must be the disc.MG CHRIS said:
Well that's verging on a mot fail, I would get them changed and get the car 4 wheeled aligned to stop it happening in the future. As for grip won't lose a lot but if pulled by plod that's the first thing they will notice.
The tread only needs to be legal across the central 75% of the tyre.tim0409 said:
P I Staker said:
Not cleaning up the hub face properly is probably what has caused your discs to feel warped out the box.
I checked the hubs were clean before I put them on, and then when I realised there was a problem double checked this and they looked fine - new disc on this afternoon and it now feels perfect so pretty sure it must be the disc.
P I Staker said:
MG CHRIS said:
Well that's verging on a mot fail, I would get them changed and get the car 4 wheeled aligned to stop it happening in the future. As for grip won't lose a lot but if pulled by plod that's the first thing they will notice.
The tread only needs to be legal across the central 75% of the tyre.MG CHRIS said:
Well that's verging on a mot fail, I would get them changed and get the car 4 wheeled aligned to stop it happening in the future. As for grip won't lose a lot but if pulled by plod that's the first thing they will notice.
Thanks Chris, but from speaking to a few BMW owners they are all having the same issue of outside wear with RF so not sure if it's something particular to RF, the BMW suspension set up or the alignment. I can't wait to change over to normal tyres as the ride is really poor with runflats!tim0409 said:
MG CHRIS said:
Well that's verging on a mot fail, I would get them changed and get the car 4 wheeled aligned to stop it happening in the future. As for grip won't lose a lot but if pulled by plod that's the first thing they will notice.
Thanks Chris, but from speaking to a few BMW owners they are all having the same issue of outside wear with RF so not sure if it's something particular to RF, the BMW suspension set up or the alignment. I can't wait to change over to normal tyres as the ride is really poor with runflats!I had exactly the same issues with ECP cheapo front discs and pads on an E46. Hubs were cleaned and discs fitted correctly, but same symptoms as you describe plus clunking noise on braking sometimes.
Exchanged pair were better, but never felt very nice and always clunked. Lasted 25k miles until they were worn out. I was actually relieved, they were so horrid. Swapped for OEM BMW discs and pads, which felt completely different, and were what I should have spent the money on in the first place.
Obviously, BMW discs and pads would have cost me a lot more than the £90 or so the whole shebang set me back at ECP, but would have been cheaper in the long run.
Exchanged pair were better, but never felt very nice and always clunked. Lasted 25k miles until they were worn out. I was actually relieved, they were so horrid. Swapped for OEM BMW discs and pads, which felt completely different, and were what I should have spent the money on in the first place.
Obviously, BMW discs and pads would have cost me a lot more than the £90 or so the whole shebang set me back at ECP, but would have been cheaper in the long run.
N Dentressangle said:
I had exactly the same issues with ECP cheapo front discs and pads on an E46. Hubs were cleaned and discs fitted correctly, but same symptoms as you describe plus clunking noise on braking sometimes.
Exchanged pair were better, but never felt very nice and always clunked. Lasted 25k miles until they were worn out. I was actually relieved, they were so horrid. Swapped for OEM BMW discs and pads, which felt completely different, and were what I should have spent the money on in the first place.
Obviously, BMW discs and pads would have cost me a lot more than the £90 or so the whole shebang set me back at ECP, but would have been cheaper in the long run.
This is going to sound like a really daft question (please bare in mind I suffer from OCD re car maintenance..) but I picked up a replacement box of two discs today (I still have the set bought yesterday which were on the car - obviously showing signs of being used) - replaced the one I thought was faulty (which has cured the problem) and was going to return the unused one with the faulty one, but really want to swap both for the new ones (if you get what I mean...)?Exchanged pair were better, but never felt very nice and always clunked. Lasted 25k miles until they were worn out. I was actually relieved, they were so horrid. Swapped for OEM BMW discs and pads, which felt completely different, and were what I should have spent the money on in the first place.
Obviously, BMW discs and pads would have cost me a lot more than the £90 or so the whole shebang set me back at ECP, but would have been cheaper in the long run.
You mention ECP cheapo, but are Pagid not meant to be a decent brand?
tim0409 said:
N Dentressangle said:
I had exactly the same issues with ECP cheapo front discs and pads on an E46. Hubs were cleaned and discs fitted correctly, but same symptoms as you describe plus clunking noise on braking sometimes.
Exchanged pair were better, but never felt very nice and always clunked. Lasted 25k miles until they were worn out. I was actually relieved, they were so horrid. Swapped for OEM BMW discs and pads, which felt completely different, and were what I should have spent the money on in the first place.
Obviously, BMW discs and pads would have cost me a lot more than the £90 or so the whole shebang set me back at ECP, but would have been cheaper in the long run.
This is going to sound like a really daft question (please bare in mind I suffer from OCD re car maintenance..) but I picked up a replacement box of two discs today (I still have the set bought yesterday which were on the car - obviously showing signs of being used) - replaced the one I thought was faulty (which has cured the problem) and was going to return the unused one with the faulty one, but really want to swap both for the new ones (if you get what I mean...)?Exchanged pair were better, but never felt very nice and always clunked. Lasted 25k miles until they were worn out. I was actually relieved, they were so horrid. Swapped for OEM BMW discs and pads, which felt completely different, and were what I should have spent the money on in the first place.
Obviously, BMW discs and pads would have cost me a lot more than the £90 or so the whole shebang set me back at ECP, but would have been cheaper in the long run.
You mention ECP cheapo, but are Pagid not meant to be a decent brand?
I can't remember what the exact brand was - it was the cheapest ECP offered for that car.
As for fitting, I fitted the first set and my local garage fitted the second (I had no time or facilities). So it's unlikely we both fitted the discs and pads badly, I would have thought.
The symptoms you describe just rang a bell for me, and I wouldn't be surprised to hear the discs were made from cheap steel in China. The car never braked with any confidence with them fitted, and by the end they were getting worrying. The state they were in when they failed an MoT after 25k miles was an eye opener.
As for fitting, I fitted the first set and my local garage fitted the second (I had no time or facilities). So it's unlikely we both fitted the discs and pads badly, I would have thought.
The symptoms you describe just rang a bell for me, and I wouldn't be surprised to hear the discs were made from cheap steel in China. The car never braked with any confidence with them fitted, and by the end they were getting worrying. The state they were in when they failed an MoT after 25k miles was an eye opener.
MG CHRIS said:
Well that's verging on a mot fail.
It doesn't look anywhere near to a MOT fail to me. The lateral grooves on the shoulder aren't cut as deep as the main tread, so cannot be considered as part of the tread pattern for MOT purposes. That leaves just the four circumferal grooves where a tread depth reading can be taken and they look well over 1.6mm to me.mcford said:
MG CHRIS said:
Well that's verging on a mot fail.
It doesn't look anywhere near to a MOT fail to me. The lateral grooves on the shoulder aren't cut as deep as the main tread, so cannot be considered as part of the tread pattern for MOT purposes. That leaves just the four circumferal grooves where a tread depth reading can be taken and they look well over 1.6mm to me.MG CHRIS said:
If the outer edges haven't got any groves showing it can fail the mot this is confirmed by the mot tester I work with. That's why I said verging not it will.
Yes, they can, if they're part of the tread pattern and within the centre 75%.On the one in the photo the lateral grooves are not part of the tread pattern
The MOT testers manual defines what is not part of the tread pattern as:
Grooves that had not been cut as deep as those containing the wear indicators when new are not to be considered as part of the tread pattern.
Ask your MOT tester colleague about this, as when I did my testers training this was very much part of the course.
MG CHRIS said:
If the outer edges haven't got any groves showing it can fail the mot this is confirmed by the mot tester I work with. That's why I said verging not it will.
That's an advise at most! For someone that's always banging on about how he's in the motor trade. You sure no nothing about it!Gassing Station | General Gassing | Top of Page | What's New | My Stuff