Hot n/s wheel, tyre pressure warning

mmm-five

mmm-five

Lifer
 Liverpool
Site Supporter
So, a 5am start for my commute down to London was going swimmingly...right until I started to feel a light vibration about 40 miles from my destination.

Didn't seem to be getting worse, but frequency increase with speed and became heavier with braking.

Got just off the M40 and onto the M25 when I got a red tyre pressure warning light. Nowhere to stop safely so decided to drive carefully to the closest petrol station and check the pressures (which were checked & adjusted the Friday before).

Got to the garage, which luckily had working air line, but immediately noticed the NSF front was caked in brake dust and was very warm to the touch. Tyre pressure was also 5 psi higher than the OSF tyre.

Reset the pressures and the warning light and headed off to do the last few miles to work. Vibration seemed to be getting worse and the car would hold itself on any uphill/downhill bits of road without the need for the handbrake, so decided to take it in to the dealer, who are going to have a look at it today and get back to me.

Sounds like a sticking piston to me - which should be covered by warranty. Any other ideas? Bearing, warped disc, etc.?

Don't forget that it had its latest inspection about 2 weeks ago :x
 
Ye sounds exactly like a sticky calliper had the same a few years ago. Might be able to get the calliper refurbed otherwise a replacement is the best option :thumbsup:
 
Sticky calliper sounds right. You'll be glad you've not given up the warranty just yet....!


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It's the fully comp, zero excess policy, so if it's covered there will be nothing to pay.

However, the car is on almost 104k, so I wonder if that will make any difference as to what is/isn't covered :(
 
mmm-five said:
Sounds like a sticking piston to me - which should be covered by warranty. Any other ideas? Bearing, warped disc, etc.?
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Sticking caliper is very likely at that mileage. Have your Brake fluid replacements been done on time? That's the only reason I can think of that they can refuse a claim,
Water is absorbed by brake fluid and can rot the calipers from the inside.
Even if the warranty doesn't cover it you can get them refurbed for about £200 a corner including labour to remove and replace - which includes bleeding the brakes.

mmm-five said:
Don't forget that it had its latest inspection about 2 weeks ago :x
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It would be a thorough inspection that removed the pistons from your brake caliper to check for corrosion :D

I know what you mean thought, Just spent £x to then have this happen
 
There is a small print on the fully comp policy that after 100k the policy changes can't remember the specific tho

but only if they record your milage.
 
Brake fluid changes done regularly (i.e. more than annually), but not by BMW after their first 2 attempts left me with a pedal that would just go to the floor :headbang:

Not that worried if they decide not to cover it under warranty as I'm supposed to be fitting some Alcon calipers (on standard discs), and this will just bring that forward a little - and it was only my own laziness that has meant the warranty hadn't been cancelled already.
 
I had this almost exactly the same. Mine was on 30k though!

Mine got so hot, it ruined the caliper, disk, brake pad and boiled the fluid.

2 new disks, caliper, sensors, pads and brake fluid all changed under warranty!
 
BMWZ4MC said:
Interestingly, it always seems to be the NSF calliper that sticks...
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The NSF tyre wears out quicker too, due to the clockwise nature of roundabouts - maybe the same thing effects the braking balance and makes that side work harder.

Or, maybe that's the side that hits more puddles :P
 
Got the call this morning, and it needs a new caliper - along with replacement for a scored disc and knackered pad.

The good news is that whilst they are implying that the both sides would need doing, it 'should' all be covered by warranty.

The bad news is that despite it being in for an inspection about 2 weeks/1000 motorway miles ago, it had 'almost bald' tyres on the rear that were not spotted during this same inspection :headbang:
 
mmm-five said:
Got the call this morning, and it needs a new caliper - along with replacement for a scored disc and knackered pad.

The good news is that whilst they are implying that the both sides would need doing, it 'should' all be covered by warranty.

The bad news is that despite it being in for an inspection about 2 weeks/1000 motorway miles ago, it had 'almost bald' tyres on the rear that were not spotted during this same inspection :headbang:
Click to expand...

Good news indeed - at least they will be practically new when you change for BBK!!
You runnng standard pads?
 
jamiez said:
Good news indeed - at least they will be practically new when you change for BBK!!
You runnng standard pads?
Click to expand...
EBC BlueStuff NDX - last about 30k miles.

Hope it is all under warranty, as my bank have just called to say my card has been cancelled after a 'fraud' attempt - which was actually my attempt to purchase tyres. They've cleared the tyres, but have said I'll have to wait for another card before I can start using it again. Problem will be if they decide some of it isn't covered by warranty, as I don't currently have another CC.

Edited to add: looks like the card cancellation has been rescinded as I've just checked out of my hotel and the card was accepted there. Next plan is to find out how much (if any) I have to pay and go to a bank branch to withdraw some cash (with extra security questions of course).

Edited to add: the original estimate of 2 calipers, 2 discs, and a set of pads (under warranty) has miraculously changed to just requiring a single caliper (under warranty) :o
 
The NSf is also where the pad wear sensor is and having had the same issue, took mine to bits to investigate. I noticed that where the pad sensor is, it aligns exactly where i found the piston seal pulled out from the piston and corroding behind. I find it far too much of a coincidence that the piston seal was disturbed in exactly this position.
 
Either the disc is scored or it isn't and needs replacing? trust they are going to check the disc face runout too to ensure it's not warped out of true. :(


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Had the same experience on my 3.0

Was warned jet washing is a common cause of caliper failure

If not done under warranty, then maybe a caliper brake upgrade, as u need to think what condition the other side may be in
 
It was replaced under warranty, but that will just be a stop-gap measure until I get my new calipers on.

Time is the enemy at the moment as my spanner monkey is very busy and hasn't got time to create a custom mounting bracket for them.
 
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