E85 Parking brake issue

[Fat Yucca]

Hi everyone,

I'm experiencing an issue with the parking brake on my 2003 3.0 manual, I hope some one may be able shed some light on. I have had a good search through the forum, but not found anything, so I apologise if this has been covered before.

The sequence of events are: I stop the car on a slope (facing down hill for instance) using the foot brake, apply the hand brake, put it in to neutral, release the foot brake and it is at this point where the car rolls forward slightly and the rear squats. Caused by the shift in load from the front brake to the rear brake.

Facing up hill I have a similar issue but the rear raises slightly.

I have checked the trailing arm bushes, and hoped a recent inspection would reveal something loose or worn but nothing, it has even passed the MOT like this. I have never had any other car that does this, is this a normal characteristic for the Z4, or is something worn/loose/broken or just need adjusting?

Any thoughts greatly appreciated.

 

[Smartbear]

That’s normal as the rear suspension takes the load the rear wheels impart on it from having the handbrake on.
Rob

 

[Fat Yucca]

Ok, I hoped that was the case.
Cheers Rob.

 

[wonkydonkey]

I drove a BMW for the first time a couple of years ago (a 3 series) and thought there was a major defect with its handbrake the first time I used it. I was on a slight incline, applied the handbrake, took my foot off the brakes and it rolled back far enough to hit the wall behind me. It did the same thing at the next stop I made, though this time I had left enough room.

I got home and Googled it and the flood of search results quickly taught me that this is expected of a BMW. I bought my Z4 last summer and, sure enough, it's the same. It seems to depend what position of rotation the wheel is in. Sometimes the handbrake lever comes up higher than other times, and sometimes the car will roll back/forward perhaps 2-4". I fitted new discs at the back and removed/replaced them three times in the same day, as well as adjusting the handbrake over and over. I read about one guy with a brand new 3 series who had the same issue. He took it back over and over for BMW to check it and adjust it several times but they couldn't get it to behave. It seems BMW just can't make a good handbrake, unfortunately! General BMW owner concensus seems to be that you must always leave the car in gear. Personally I haven't had this paranoia with any other car I've owned.

 

[Marlon]

Thanks for the question OP (and the answers Rob & wonkyd :wink: ) this reassures me that I'm not alone in questioning my parking skills - I thought it was just the old handbrake ratchet on the way out but now its replaced with a new one I did question what the hell was going on the other day parking on a slight incline!

 

[Migizi]

...General BMW owner concensus seems to be that you must always leave the car in gear...

Interesting discussion - I was taught from day 1 to always leave the car in gear (Reverse if facing uphill, or forward great if parking on flat surface or facing downhill) with the e-brake every time I parked.

 

[philbo909]

Parking on an incline I always leave her in gear, belt and braces.

 

[wonkydonkey]

...General BMW owner concensus seems to be that you must always leave the car in gear...

Interesting discussion - I was taught from day 1 to always leave the car in gear (Reverse if facing uphill, or forward great if parking on flat surface or facing downhill) with the e-brake every time I parked.

I know that this gets taught, and leaving a car in first gear isn't a bad idea (just not one I subscribe to, on a typical incline). However, reverse gear is typically a longer ratio than first gear, meaning that leaving the car in reverse will increase the chances of the car rolling away if the handbrake fails!

 

[NickDE]

I just put mine in P and walk away. I have no clue what that lever between the seats is for

 

[Smartbear]

...General BMW owner concensus seems to be that you must always leave the car in gear...

Interesting discussion - I was taught from day 1 to always leave the car in gear (Reverse if facing uphill, or forward great if parking on flat surface or facing downhill) with the e-brake every time I parked.

I know that this gets taught, and leaving a car in first gear isn't a bad idea (just not one I subscribe to, on a typical incline). However, reverse gear is typically a longer ratio than first gear, meaning that leaving the car in reverse will increase the chances of the car rolling away if the handbrake fails!

If a car of mine rolled away whilst in gear (reverse or forwards gears) I’d be getting a compression test carried out after recovering the wreckage!
Rob

 

[Silverzedtom]

Mines the same - sounds like they all are. When I changed my rear disks and re tightened the handbrake I was expecting it to improve, it didn’t so when I took it to bmw for its mot I asked them to check it and as the others have said it’s totaly normal. It isn’t exactly confidence inspiring though :lol: I tend to leave the handbrake half on and in gear, the only reason I leave it slightly on is incase it rolls away when I’m not there and someone notices the handbrakes down

 

[Grumpyowl]

As above , I would never trust any handbrake in isolation, always leave in first gear even on the flat .
I remember some years ago Citroen advising this on certain models where the handbrake worked on discs when the discs cooled (contracted) the car would roll away.

 

[Mr Tidy]

Yes, it seems to be a standard feature on BMWs!

Both my E46s did it, as did my E87, my current E91 and both of my E86s! But to be fair it does seem more pronounced in some than others.

Maybe it's partly because the footbrake stops the car using the discs, but the handbrake uses it's own drum brakes at the rear. I've had cars that used the discs for the handbrake and none of them had that trait.

 

[Jakg]

BMW handbrakes are rubbish, but with careful adjustment you can get something passable.

Unless your adjusters are seized, like mine...

 

[Migizi]

..., reverse gear is typically a longer ratio than first gear, meaning that leaving the car in reverse will increase the chances of the car rolling away if the handbrake fails!

I do not understand, but I am interested in learning more - (despite what my wife says )
- please elaborate

 

[wonkydonkey]

..., reverse gear is typically a longer ratio than first gear, meaning that leaving the car in reverse will increase the chances of the car rolling away if the handbrake fails!

I do not understand, but I am interested in learning more - (despite what my wife says )
- please elaborate

To give an extreme example; park your car on a flat road and leave the handbrake off, with the engine switched off. Select first gear, and then get out and try to push the car. You probably won't be able to make it move. Now select sixth gear and try to push it, and you will be able to move the car. This is because sixth gear is a longer gear than first, meaning that for each revolution of the engine, the wheels turn further than they do in first gear. So to stop your car rolling away, the most effective way is to select the gear with the shortest ratio (i.e. first gear). Since reverse gear is normally a longer gear than first gear (that is to say that your car will travel faster in reverse gear than it will travel in first gear), reverse is technically going to offer less resistance to your car rolling away.

 

[Migizi]

I did not know that (nor had I ever thought of it that way)
thanks for the explanation

 

[wonkydonkey]

[ref]Migizi[/ref] no probs!

 

[Bing]

I thought it was first facing uphill or flat, and reverse facing downlhill ?

 

[road warrior]

I'm happy now!
My problem ridden Steve has a perfect handbrake! ,
The back-end raising is normal, old folk will remember the likes of the aleggro which would raise 6"" in the air