Problems with brakes

N

Nictrix

Elite
 Paisley
I have posted this in the lounge as its not specific to any one model.
Has anybody had any problems with particular brake pads or discs?
The problems that I am having is with both the Z4 and the X6.
Last year I replaced the front discs and pads on the X6 with Brembos. After a few thousand miles the car developed juddering/wobbling while braking at speed which is getting worse, just like you would expect with a warped disc. Discs and pads were fitted by myself making sure that everything was spotless before fitting the new parts.
Fast forward to fitting the new discs and pads to the Z4, also Brembo, and after around 4000 miles it has developed almost the same juddering/wobbling while braking. Not quite to the same extent as they are smaller discs but its still doing it.
In my mind I have it that the Brembo discs and pads are somehow no good and am thinking of replacing with Pagid.
It really spoils the drive when you know that when the brake pedal is touched its going to pulsate.
 
Hi, l am a newbie here, used to be an impreza owner,...lol, just bought a z4, this could be down to not bedding the brakes
/pads in, or holding your foot on the peddle when the brakes are hot, ie, after going down hill, a or "sporty" drive, and keeping pressure on the peddle when stationary, ie increasing heat in/on one part of the disc, hence warping/vibration. found this ope it helps.
https://www.carid.com/brembo/info/bedding-guide.html
 
I doubt it's the Brembo parts. I had all sorts of problems with my brakes 18 months ago after fitting Mtec discs and Red Stuff pads....never again ! I replaced the discs and pads all round with standard Brembo back in April and have had no issues whatsoever :thumbsup:
Maybe your problem lies with the calipers themselves i.e the pistons or sliders ? :(
 
bigredrob said:
Hi, l am a newbie here, used to be an impreza owner,...lol, just bought a z4, this could be down to not bedding the brakes /pads in, or holding your foot on the peddle when the brakes are hot, ie, after going down hill, a or "sporty" drive, and keeping pressure on the peddle when stationary, ie increasing heat in/on one part of the disc, hence warping/vibration. found this ope it helps.
https://www.carid.com/brembo/info/bedding-guide.html
Click to expand...

Agreed, very rare it’s warped discs - have had an issue with our hybrid which uses regen technology to charge, they fitted revised discs with better cooling & so far issue hasn’t reappeared
 
Some good points above and just to clear these up all brake parts are free moving, no sticking pistons, sliders etc. Everything was completely cleaned after removal along with the wheel hub being heavily wire brushed to remove any rust. Pads slipped into their places and were not jamming on anything. Wheels spin easily when the wheel is raised off the ground on both cars.
Both cars had no issues before replacing the brakes and are driven in the same manner as with the old brake parts.
I understand that there is a possibility that the bedding in procedure may not have been done correctly but is this more of an issue with Brembos over other brake manufacturers?
I mean how many cars are sold with the owners not bedding in the brakes properly as they dont know how with no issues?
Reading the guide that Bigredrob put up I am thinking it could be to do with the coating on the disc.
I have also read, although I struggle to believe it, that there is no such thing as warped brake discs and that the feeling of warped brake discs is down to brake pad material being left unevenly distributed around the disc.
 
I bought a 335 xd new in July 2015. - I specced the M sport brakes.
They always felt a wee bit on the rough side and although good, they have never been outstanding.
When I had the car mot’d in July, I was overjoyed to be told that there’s a 20mm band of corrosion on the inner face of the front discs. They’ll stay like that until the spring when they will plunder my wallet by £640 to replace the kit.

I suspect there was rust on them from new. I’ve never ever had front brakes deteriorate so quickly. Maybe it’s because it gets treated gently most of the time?
 
When you fitted them, did you check the run-out? Most people don't that I have seen.

You can get the disks skimmed on the car, though you should have new pads fitted afterwards.

My wife's car had something similar with pulsing. Had the fronts skimmed but it returned. Long story short, but the backs were also warped and that seemed to be causing some feedback to the front caliper. Had to have new discs front and back at the same time and it's been fine since.
 
I will be friction lining transfer that’s causing the issues

The thing is, withall cheap brake pad and disc manufacturers, the products are made of crap.

Brembo, pagid, eicher to name a few are all under the same umbrella of parts supply and usually sold through ECP..

Who knows what’s actually coming out of that brightly coloured boxes you have been supplied with
 
I had a set of brembo discs/pads on the front last year that weren't flat from factory, so it does happen. Replaced free of charge and no issues after
 
philbo909 said:
I had a set of brembo discs/pads on the front last year that weren't flat from factory, so it does happen. Replaced free of charge and no issues after
Click to expand...
I take it these were checked before fitting though?
It would be difficult to prove that something was faulty from the factory after running for a few thousand miles.
 
PaulG said:
When you fitted them, did you check the run-out? Most people don't that I have seen.
You can get the disks skimmed on the car, though you should have new pads fitted afterwards.
Click to expand...
No they were not checked for run out when fitting.
Im not sure on the cost for skimming a disc or where I could get it done but somehow I think it would almost be cheaper to replace the disc especially if you have to fit new pads anyway.
 
Exactly the same issue here. First my front discs were totally shot, so I replaced them and the pads and it was ok. Then it came back and I realised it was a ridge on the rear discs.

Replaced and it was all fine again, for a bit.

At the moment it occurs when braking from 60mph+

I think it's actually a sticky caliper / seals on the way out. Whenever I fiddle with the brakes I think I free it up temporarily and it is ok. Then after a bit of not driving they get sticky again.

Pop off the calipers and give them a clean and try and free them up.
 
After being in my shed and finding a box of Brembo pads for the X6 I realise that I have missed a step.
The X6 needed front pads a while ago and I replaced them with a set of Brembos.
After a few weeks I had the pulsing in the pedal and steering shake when braking from upwards of 50mph.
I took it to get checked to see what the issue was and was told one of the front discs was warped.
I then swapped both the discs and pads on the front for a new full set of Brembos and the problem came back with these.
Before changing anything there was no pulsing through the pedal or steering wheel shake.
The problem to me seems to be the pads and how they are bedded in as the problem arose with a used set of discs with new pads.
I have cleaned up the set of pads that were used for a short time and am going to try fitting these to see if the problem changes.
If it doesnt I will probably just get a set of BMW discs and pads and go from there.
I may have to buy a run out gauge to check this also.

Ronk, I would highly doubt if there was any band of corrosion on the rears as the car is used daily so shouldnt have any build up.
This will be checked while swapping out the pads though.
 
Nictrix said:
PaulG said:
When you fitted them, did you check the run-out? Most people don't that I have seen.
You can get the disks skimmed on the car, though you should have new pads fitted afterwards.
Click to expand...
No they were not checked for run out when fitting.
Im not sure on the cost for skimming a disc or where I could get it done but somehow I think it would almost be cheaper to replace the disc especially if you have to fit new pads anyway.
Click to expand...
https://skimmydiscs.co.uk/ will find your local garage that can do it. From what I remember, it wasn't expensive to do.
 
Nictrix said:
philbo909 said:
I had a set of brembo discs/pads on the front last year that weren't flat from factory, so it does happen. Replaced free of charge and no issues after
Click to expand...
I take it these were checked before fitting though?
It would be difficult to prove that something was faulty from the factory after running for a few thousand miles.
Click to expand...
Oh after a few thousand miles it will be brake pad deposits on the discs, could get them skimmed if a bit of hard braking doesn't solve it?
 
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