Audi parking brake auto release

Nino Brown

Hi All,

My Audi A5 started acting up a bit yesterday, the parking brake doesn't auto release as I drive away. The way it should work, and has done for the last year since I got the car is, once the seat belt is on, and you've touched the brake, the parking brake brake disengages once there is enough torque to move the car forward as you drive away.
Starting yesterday, when I lift off the brake to drive away, the console says "please release parking brake", and if I try to drive away the parking brake doesn't release.
It's not a huge problem, since it will manually release with the button, it's just sort of embarrassing in car parks when I forget, and steep hill starts will be tricky. Has anybody seen this before?
I'm thinking it needs a new parking brake control module but that probably won't be cheap, I'd hate to put a new one in to find it wasn't the problem.

George Dalton

Manual or auto?

Kopparberg Strawberry and Lime

Probably just a sensor on the pedal or something small.

I say you wouldn't be the first with this issue so maybe a quick phone call to audi service might sus it out quick enough

ironclaw

The manual release on the Tourareg foot brake has a habit of 'sticking' too. You have to manually release twice. Not identical to the A5 issue as its full manual but quickly sorted by VW.

mickdw

So its behaving as if you dont have the seat belt on?
Any other functions in the car behaving like you dont have the belt on?

Nino Brown

George Dalton wrote: »

Manual or auto?

Manual

Nino Brown

mickdw wrote: »

So its behaving as if you dont have the seat belt on?
Any other functions in the car behaving like you dont have the belt on?

Yeah, exactly, but the seatbelt light goes out when I put on the belt.
I think I can turn off the seatbelt check in VCDS, I'll give that a go and see if it helps.

enumbers

what year a5 will need a plug in to confirm but have seen the clutch pedal position sensor on the master cylinder causing this issue. its built into the cylinder stops picking up position of pedal so doesn't know when to release brake.

Nino Brown

enumbers wrote: »

what year a5 will need a plug in to confirm but have seen the clutch pedal position sensor on the master cylinder causing this issue. its built into the cylinder stops picking up position of pedal so doesn't know when to release brake.

09, I have VCDS, haven't got a chance to plug it in yet as I've been working, I'll give it a go tomorrow. Should it throw up an error code if it's the clutch cylinder? If that's the case a new cylinder is only way fix it I assume?

enumbers

normally logs a fault and cylinder replacement is the only fix,sensor is part of it. Not very expensive though think something like 125 +vat from audi for the a4s

Gazzmonkey

Well in my b8 a4, the electromechanical handbrake won't auto disengage at the very beginning of my journey, I have to manually disengage it but after that the handbrake will auto disengage if the biting point is reached. It's always been like that.

Fundthementals

Had the exact same issue with my B6 Passat - EPB could only be released by the push button .
Turned out it was the clutch Hall effect sensor . Part cost 50 euro and 150 labour/diagnostics.

mickdw

Gazzmonkey wrote: »

Well in my b8 a4, the electromechanical handbrake won't auto disengage at the very beginning of my journey, I have to manually disengage it but after that the handbrake will auto disengage if the biting point is reached. It's always been like that.

Well it's faulty unless you have a habit of only putting your belt on once moving

George Dalton

Does the car have cruise control? If so has it stopped working as well?

Nino Brown

George Dalton wrote: »

Does the car have cruise control? If so has it stopped working as well?

No cruise control, so far the only symptom I've come across is the handbrake not auto releasing.

mickdw

Nino Brown wrote: »

No cruise control, so far the only symptom I've come across is the handbrake not auto releasing.

Cruise was standard I'm pretty sure.
import maybe?

Nino Brown

enumbers wrote: »

normally logs a fault and cylinder replacement is the only fix,sensor is part of it. Not very expensive though think something like 125 +vat from audi for the a4s

Fundthementals wrote: »

Had the exact same issue with my B6 Passat - EPB could only be released by the push button .
Turned out it was the clutch Hall effect sensor . Part cost 50 euro and 150 labour/diagnostics.

Thanks lads, I wouldn't have thought of a sensor on the clutch.

Nino Brown

mickdw wrote: »

Cruise was standard I'm pretty sure.
import maybe?

UK import

Nino Brown

Nice call gentlemen.

Clutch Position Sensor (G476)
007 -- Short to Ground
Freeze Frame:
Fault Status: 01100111
Fault Priority: 6
Fault Frequency: 1
Reset counter: 237

http://workshop-manuals.com/audi/a5/power_transmission/6-speed_manual_gearbox_0b3_front-wheel_drive/clutch_control/exploded_view_pedal_cluster_(rhd_vehicles)/
12 - Clutch position sender -G476-
Clutch pedal switch -F36- and clutch pedal switch for engine start -F194- are integrated
Can only be renewed together with clutch master cylinder


Thanks for the help lads, George I'll be in touch.

enumbers

Thanks for the update, nice to get feedback