Parking brake - 2007 Z4 3.0i

Dropped the car off at the dealership to have a headlight bulb replaced and the horn fixed. Figured as long as it was there, I'd have them check out a metallic, rotational noise coming from my rear wheel for the last couple of weeks (thought I had a dust shield or squeal pad out of alignment.)

Got a call from the SA yesterday... found the cause of the noise.

He asked me if I had been driving with the parking brake engaged (I have not) because the 'parking brake shoes were completely worn out.' Can't figure out how that could have happened. They're going to replace/repair/adjust them under warranty/goodwill so no worries there.

The only thing I can think of is that the brake may not be fully disengaging when released, so it basically gets worn out. Have had a few instances where after parking overnight or a day or 2, upon release and then backing up, the brake is 'hung', so I re-engage it and re-release it, which seems to clear it.

Was just wondering if anyone else has run into this or if there are any known TSRs, etc out there about it.

tia,

bob p

Originally Posted by skyjmpr

Dropped the car off at the dealership to have a headlight bulb replaced and the horn fixed. Figured as long as it was there, I'd have them check out a metallic, rotational noise coming from my rear wheel for the last couple of weeks (thought I had a dust shield or squeal pad out of alignment.)

Got a call from the SA yesterday... found the cause of the noise.

He asked me if I had been driving with the parking brake engaged (I have not) because the 'parking brake shoes were completely worn out.' Can't figure out how that could have happened. They're going to replace/repair/adjust them under warranty/goodwill so no worries there.

The only thing I can think of is that the brake may not be fully disengaging when released, so it basically gets worn out. Have had a few instances where after parking overnight or a day or 2, upon release and then backing up, the brake is 'hung', so I re-engage it and re-release it, which seems to clear it.

Was just wondering if anyone else has run into this or if there are any known TSRs, etc out there about it.

tia,

bob p

Ask them if this bulletin applies to you car.
SIB 34 03 06 dated March 2006

Parking Brake Noise

MODEL
E85 (Z4)

SITUATION
When the parking brake is not being applied, the brake shoes rub on the brake drum and cause grinding or squeaking noises.

CAUSE
Faulty parking brake pressure springs.

CORRECTION
In case of a customer complaint, install improved pressure springs (4x).

PARTS INFORMATION
Part Number 34 40 6 774 707 ($1.37r each)
Description Pressure springs
Quantity 4

There was a similar issue with the parking break on the Z3's, as just after I bought my used '00 Z3 I began noticing a metallic rattling noise coming from the rear of my rig, seemingly from the tire/wheel area. Took it in, along with copies of various threads from this BB suggesting that such a noise could be caused by the parking break needing an adjustment, and sure enough, the adjustment did the trick.

Thanks for the input. If I were a betting man, I'd wager that the parking brake was badly out of adjustment. Picked up the car and the brake lever has an entirely different feel to it now.

thx again
bob p