rough ride and jerky braking

[dr_john]

Back on topic, I've found that the brakes need only a gentle touch, any more and the braking is quite severe.

I did notice some vibration and steering issues yesterday and then discovered that I have Land Departure Warning which occurs when crossing a white line at speed, unless the indicators are used. I didn't know that I had got it! It can only be turned off for the duration of the current journey.

I turned off the steering intervention permanently and turned down the vibration warning to medium. That way you don’t get an unexpected tug at the wheel when changing lanes and the vibration is minimum but sufficient to let you know that you are near or crossing a white line.

Yes I've done the same, the last thing I want is the steering being tugged at when I'm doing 70+. The vibration is now set to minimum, I can hardly feel it. My dealer said that BMW have received complaints and he recommended keeping it turned off.

I also had an issue with the collision warning system, again I didn't know I had it (doesn't appear in the spec sheet). First few times I had a drive I got a red car warning symbol in the instrument cluster with no explanation, the car was set to the most sensitive setting (out of 3 levels), I reset it to least sensitive and no more problem.

 

[mr wilks]

nowhere near the crashy ride of my old e89 msport. It’s firm but complaint, and I don't wince when I see a pot hole coming!

Ive covered a fair few miles in 3 different E89s.
23i se
35i Msport & lowered with H&Rs
35is adaptive ride.

Can't ever recall thoughts in any of them of "crashy ride" :?

 

[Beeacon]

nowhere near the crashy ride of my old e89 msport. It’s firm but complaint, and I don't wince when I see a pot hole coming!

Ive covered a fair few miles in 3 different E89s.
23i se
35i Msport & lowered with H&Rs
35is adaptive ride.

Can't ever recall thoughts in any of them of "crashy ride" :?

When mine was on Runflat rubber I was terrified of potholes! Really crashy (though I have just found a broken rear coil spring so that could be the culprit).

 

[simonbarton]

Conclusion therefore is that the new Z4 does indeed have very sensitive braking. Dealer told me they would bed in but i'm still jerking my way round town!! :driving:
Auto gear changes when slowing down are certainly far from smooth but that appears to be a symptom of the car. Be interesting to see if an upgrade in the future addresses this issue.

 

[enuff_zed]

i'm still jerking my way round town!! :driving:

Always love a bit of ambiguity

 

[Kimz4]

nowhere near the crashy ride of my old e89 msport. It’s firm but complaint, and I don't wince when I see a pot hole coming!

Ive covered a fair few miles in 3 different E89s.
23i se
35i Msport & lowered with H&Rs
35is adaptive ride.

Can't ever recall thoughts in any of them of "crashy ride" :?

When mine was on Runflat rubber I was terrified of potholes! Really crashy (though I have just found a broken rear coil spring so that could be the culprit).

Same, honestly scared of some potholes :?

 

[millview22]

I have been driving mine for a week now. No issues with the brakes. The ride is miles better than the E89. Interestingly though, I noticed that the tyre pressures were all at 3.1 bars. The recommended pressure is 2.2 front and back or 2.7 for eco-driving. Clearly not checked at pre-delivery!

 

[phreak]

I've received my new G29 Z4 yesterday and encounter the same issue as well. Car starts to jerk a big time when decelerate and switching from 3rd to 2nd gears. It gets pretty annoying during traffics and long ride.

Today I am driving to the dealer and see if it can be solved.

 

[ronfredwood]

I know this is an olb post but did you get any joy from the dealer as I am also having difficulty with the over-sensitive brakes? The auto gear change is fine but still makes it hard to come to a smooth stop.
Z4 G29 S drive 2.0i sport.

 

[Wyldie85]

The brakes will ease up once they bed in. I have t felt or heard anything like you explained with the gearbox. I’ve found it to be incredibly smooth and well rounded.

 

[dr_john]

Had my 2.0 Sport for about 6 months now and I don't notice any braking issues now.

Maybe they bedded in or I got used to it!

 

[bonzo]

nowhere near the crashy ride of my old e89 msport. It’s firm but complaint, and I don't wince when I see a pot hole coming!

Ive covered a fair few miles in 3 different E89s.
23i se
35i Msport & lowered with H&Rs
35is adaptive ride.

Can't ever recall thoughts in any of them of "crashy ride" :?

When mine was on Runflat rubber I was terrified of potholes! Really crashy (though I have just found a broken rear coil spring so that could be the culprit).

Ah, pot holes and run flats. I've already had the pleasure of parting with £800 for a new front wheel on my G29 thanks to a pot hole.

 

[Samiad]

I picked up my s30i a few days ago and I'm experiencing the same jerky behaviour when braking to a standstill, as the car changes down through the gears (even in comfort mode). The more gentle/gradual I am with the brakes, the more pronounced the engine braking disrupts the deceleration (i.e. if I brake late and hard the jerkiness is masked somewhat, but then you get a pretty aggressive/disruptive weight shift due to the heavier braking!).

I've only got 100 miles on the car so I'm hoping the car will settle down as everything breaks in, but in the meantime I'll notify my dealer (just to get a record of it) and see how it goes.

 

[millview22]

Try disabling automatic hold...

 

[Ed Doe]

I did notice some vibration and steering issues yesterday and then discovered that I have Land Departure Warning which occurs when crossing a white line at speed, unless the indicators are used. I didn't know that I had got it! It can only be turned off for the duration of the current journey.

How high were you jumping it before ethe land departure warning went off? :lol:

 

[dr_john]

I did notice some vibration and steering issues yesterday and then discovered that I have Land Departure Warning which occurs when crossing a white line at speed, unless the indicators are used. I didn't know that I had got it! It can only be turned off for the duration of the current journey.

How high were you jumping it before ethe land departure warning went off? :lol:

Predictive text, don’t you just love it

 

[ronfredwood]

I agree Samiad. Driven 1k miles and no improvement. The brakes seem to 'stick' even with the lightest touch when coming to a stop. Eco-mode with less aggressive gear changes helps slightly but it is definitely the brakes causing the problem.

 

[Samiad]

I got my hopes up that it could be the auto-hold (I've been using it since day 1) but I could not observe any difference in feel whether auto-hold was enabled or disabled.

Agree that eco-mode is smoother, noticeably.

I don't agree this is caused by the brakes though - it feels 100% engine braking related to me. When the transmission decides to drop down a gear it seems unable to rev match adequately to prevent the jerking (also the reason why it is worse in sport mode as the revs are kept higher in that mode increasing the jerkiness).

Here's a simple test to see if it's related to engine braking. Try this on a quiet piece of road and recreate the gradual slowing to a standstill - but instead of applying the brakes as usual and getting the jerky engine braking, knock the gear stick into neutral and then start braking. No downshifting, and no jerkiness (assuming you can keep slight and consistent pressure on the brake pedal until stopped).