S80: Wheels/Brakes Electronic parking brake problem HELP PLEASE!!

[kenny37]

Dads 08 v70 had his module replaced after his brakes jammed on , cost £280 all in.

[SXCXC]

Originally Posted by kenny37

Dads 08 v70 had his module replaced after his brakes jammed on , cost £280 all in.

That's not bad since the module is £200 and the software is £50 without all the labour involved. (That's all before the FRF discount mind)

[nashamiki]

Hello. I know I'm almost 5 years late getting here. But I'm curious to hear how this problem finally got resolved.

In my S80 2007 model the "Park Brake Not Fully Released" message kept coming up on the dashboard with the red triangle signal and the audible alarm kept going on and on even though the car was obviously moving and I was wondering why the onboard computer could not figure out that since the car is moving normally that must mean that the Parking Brake had already been fully released. IMHO what an idiotic electronic parking brake system causing so much tension to the user.

The Volvo "specialist" I took the car to said some "module" was faulty and would have to be replaced. He also said there was nothing that could be done to stop the audible alarm in the meantime while waiting for the part to be ordered.

So I went back home completely ****ed off with the nutcases back in Sweden who designed the system. What? No way to disconnect the audible alarm?

I opened up the Manual and looked up fuses. Refer here :
http://new.volvocars.com/ownersdocs/...0_06.htm#pg210

and go to page 210, then page 215 to refer the fuses in the rear trunk. Scroll down to Module B (White) Fuses No. 11 and 12.

That's what it says in the Manual. But what I found is that actually the Fuses No. 11 and 12 are in the middle set, i.e Module A. Plus the fuses are installed upside down compared with the diagram in the Manual. At least that is what I found here in Malaysia. Just one more of the many, many things wrong with this miserable model.

Well I just pulled out the 2 fuses. That's all and now the audible alarm has stopped, although the warning message still comes up on the dashboard. Meanwhile something strange is that the "Parking Assist" function has also been disabled. Which, according to the fuses layout has nothing at all to do with Fuses No. 11 and 12.

Anyway I can now still drive normally without that damned noise going off all the time. Still waiting for that "module" to arrive.

[apersson850]

If the parking brake isn't fully retracted, it seems very reasonable that the alarm is sounding all the time, since the risk for overheating the brake must be imminent. That the car is able to move doesn't say that the parking brakes aren't partially applied.
The electric system, like everything else, is continuously updated by Volvo. Your owner's manual may not reflect exactly your model, since there are updates that are put in production in the middle of the model year.

[nashamiki]

Actually the Volvo specialist I went to informed me that the parking brake on the passenger side was functioning normally while the one on the driver's side was not functioning at all. Meaning that the former was able to be engaged and released normally. While the latter was not engaging at all. So even when the passenger side parking brake had already been released I suppose the sensor was reading that the driver's side parking brake, although not engaged, had not been fully released. The mechanic even checked and confirmed that both parking brakes had been fully released.

Even when driving I do not detect any sluggishness and acceleration and deceleration are normal as experienced previously. Anyway a word of thanks for your words of caution.

[apersson850]

There are no sensors checking the parking brake pad positions. The motor applies a torque to apply the brake, and stops when it senses (through the motor's power consumption) that the brake has been applied.
When it retracts, it checks that the motor runs for a certain time. If the brake couldn't release, the motor was blocked, and you get an alarm.
But if the brake didn't apply properly, that alsom imples it can't be retracted, and you get an alarm about that you may destroy something if you drive the car anyway.

So the control system does its best to check proper operation, and if it can't assess that, it will rise a flag of concern.

[IainG]

Hi

Originally Posted by nashamiki

Actually the Volvo specialist I went to informed me that the parking brake on the passenger side was functioning normally while the one on the driver's side was not functioning at all. Meaning that the former was able to be engaged and released normally. While the latter was not engaging at all. So even when the passenger side parking brake had already been released I suppose the sensor was reading that the driver's side parking brake, although not engaged, had not been fully released. The mechanic even checked and confirmed that both parking brakes had been fully released.

Even when driving I do not detect any sluggishness and acceleration and deceleration are normal as experienced previously. Anyway a word of thanks for your words of caution.

Surprised they suggested the module was faulty straight away. Could the motor/drive screw on the drivers side be seized or stiff, and the module is then picking up an actual fault. Worth checking the freedom of the motor drive first??

Iain