Hi
I have a facelifted black 07 roadster, and I seem to be having a problem I've not heard of on here ...
About 6 months ago the brake warning light came on orange ... brakes seemed fine, fluid levels were OK, and the car was going in for a service in a couple of weeks, so I just drove it. The light was on intermittently over the next couple of weeks. The only thing I noticed was that if the light was on, the 'anti rollback' mechanism would not operate. I assumed that the light was implying that the anti rollback device was inoperable for some reason.
So the car was serviced, and as part of that it had new front disks, new front pads and a hydraulic fluid flush. I told BMW about the warning light and asked them to investigate. After the service I was told that after the replacement brakes stuff was done, the light was out, so they assumed no problems.
I picked the car up, and sure enough the warning light was out. However it returned to it's intermittent nature within a few days. Six months on from the service it's now on much more than it's off.
I've just taken the car in for it's MOT and they gave me an advisory due to the brake warning light being on. They were at pains to point out that the brakes themselves and the handbrake were all operating fine, and that no problems were evident. However I was able to talk to the engineer and explained what had happened.
First off he told me that Z4's did not have 'anti rollback' - which was a little annoying, and gave me cause to doubt his other points.
After I persuaded him that the car did have anti-rollback, he suggested that the none-working of the anti-rollback was more likely to be a symptom of the brake warning light being on, rather than the warning light being an indication that the anti-rollback was not working. This was an interesting idea and I can sort or understand why it might behave like that.
He suggested that as the problem was intermittent a possible cause was a fault in either the front brake loom, or the rear brake loom, which sound expensive to me.
I'm not so sure. The fact that the warning light on / off ratio has changed from 20 / 80 to about 90 / 10 over the last six months seems to indicate some kind of mechanical wear to me.
So my question is has anyone else had any problems with anti-rollback ? Is this likely to be the cause of my problem, or am I looking a brake fault which is causing the anti-rollback to be none-operational. Are there any quick / easy fixes ? Inquiring minds would like to know !
-- Chris
I have a facelifted black 07 roadster, and I seem to be having a problem I've not heard of on here ...
About 6 months ago the brake warning light came on orange ... brakes seemed fine, fluid levels were OK, and the car was going in for a service in a couple of weeks, so I just drove it. The light was on intermittently over the next couple of weeks. The only thing I noticed was that if the light was on, the 'anti rollback' mechanism would not operate. I assumed that the light was implying that the anti rollback device was inoperable for some reason.
So the car was serviced, and as part of that it had new front disks, new front pads and a hydraulic fluid flush. I told BMW about the warning light and asked them to investigate. After the service I was told that after the replacement brakes stuff was done, the light was out, so they assumed no problems.
I picked the car up, and sure enough the warning light was out. However it returned to it's intermittent nature within a few days. Six months on from the service it's now on much more than it's off.
I've just taken the car in for it's MOT and they gave me an advisory due to the brake warning light being on. They were at pains to point out that the brakes themselves and the handbrake were all operating fine, and that no problems were evident. However I was able to talk to the engineer and explained what had happened.
First off he told me that Z4's did not have 'anti rollback' - which was a little annoying, and gave me cause to doubt his other points.
After I persuaded him that the car did have anti-rollback, he suggested that the none-working of the anti-rollback was more likely to be a symptom of the brake warning light being on, rather than the warning light being an indication that the anti-rollback was not working. This was an interesting idea and I can sort or understand why it might behave like that.
He suggested that as the problem was intermittent a possible cause was a fault in either the front brake loom, or the rear brake loom, which sound expensive to me.
I'm not so sure. The fact that the warning light on / off ratio has changed from 20 / 80 to about 90 / 10 over the last six months seems to indicate some kind of mechanical wear to me.
So my question is has anyone else had any problems with anti-rollback ? Is this likely to be the cause of my problem, or am I looking a brake fault which is causing the anti-rollback to be none-operational. Are there any quick / easy fixes ? Inquiring minds would like to know !
-- Chris
However, as soon as something is wrong the hill hold assist stops working so that is just a symptom, not a fault and as soon as the source issue is addressed (whatever it is), it will be resolved.