Difference between revisions of "VW Passat (3C) Parking Brake"
| Line 22: | Line 22: | ||
* Ignition on, engine off. | * Ignition on, engine off. | ||
* Cycle the Parking Brake ON, then OFF first. ''The normal hydraulic brake pedal must be applied before the EPB will operate.'' | * Cycle the Parking Brake ON, then OFF first. ''The normal hydraulic brake pedal must be applied before the EPB will operate.'' | ||
| + | ** The parking brake MUST be OFF or Basic Settings cannot operate. Measuring Block group 012.2 can be used to confirm if the status is Open (released/off) or Closed (clamped/on). | ||
'''[Select]'''<br> | '''[Select]'''<br> | ||
'''[53 - Parking Brake]'''<br> | '''[53 - Parking Brake]'''<br> | ||
Revision as of 14:38, 7 May 2014
Coding
Note: When replacing the Parking Brake Control Module it is necessary to save a complete Auto-Scan before performing repairs. The ABS Module coding will be lost when the Parking Brake Module is replaced. You MUST have a record of the existing coding or you won't be able re-code the ABS module!
- 0000010 = Parking Brake without Auto-Hold (North America)
- 0000011 = Parking Brake without Auto-Hold (Rest of World / PR-UH1)
- 0000012 = Parking Brake with Auto-Hold (Rest of World / PR-UH2)
- 0000013 = Parking Brake with Auto-Hold (North America)
Basic Setting
Caution!
- Do not perform any of these Basic Settings while the brakes are disassembled! Opening, closing, function tests, and otherwise cycling the Electronic Parking brakes should only be done with the pads and calipers properly installed on the rotors.
- Please follow the procedures EXACTLY. There's a reason for every step. If you skip any prerequisites or other steps here, you are likely to experience "issues" for which no documented resolutions exist, in which case we will not be able to help you resolve them.
- It is strongly recommended to run a full Auto-Scan first thing to check for any preexisting faults! There have been several reports of repair shops damaging the Electronic Parking Brake System when trying to do rear brakes, but not telling the customer and then sending the car out the door.
Open Rear Parking Brake
Prerequisites:
- Connect a battery charger as per repair manual.
- Ignition on, engine off.
- Cycle the Parking Brake ON, then OFF first. The normal hydraulic brake pedal must be applied before the EPB will operate.
- The parking brake MUST be OFF or Basic Settings cannot operate. Measuring Block group 012.2 can be used to confirm if the status is Open (released/off) or Closed (clamped/on).
[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 007
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The brake pads are now opening.
Important: Wait 30 seconds after the brakes stop moving before carrying out the next step.
Due to a firmware problem in some modules, failure to wait can result in damage to the control module.
[Done, Go Back]
[Close Controller, Go Back - 06]
- Turn ignition off.
The caliper pistons do not move back into the caliper, this is normal.
Close Rear Parking Brake
Prerequisites:
- Connect a battery charger as per repair manual.
- The Parking Brake must be OFF before Basic Setting are possible.
[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 006
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The brake pads are now closing.
Important: Wait 30 seconds after the brakes stop moving before carrying out the next step.
Due to a firmware problem in some modules, failure to wait can result in damage to the control module.
[Done, Go Back]
[Close Controller, Go Back - 06]
Function Test
Prerequisites:
- Connect a battery charger as per repair manual.
- The Parking Brake must be OFF before Basic Setting are possible.
[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 010
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The brake pads are now opening and closing 3 times.
Important: Wait 30 seconds after the brakes stop moving before carrying out the next step.
Due to a firmware problem in some modules, failure to wait can result in damage to the control module.
[Done, Go Back]
[Close Controller, Go Back - 06]
Longitudinal Acceleration Sensor (G251)
Prerequisites:
- System voltage at least 12.0 V.
[Select]
[03 - Brake Electronics]
[Measuring Blocks - 08]
Group 004
[Go!]
Check field 4, the value has to be between -1.5 and +1.5 m/s².
[Done, Go Back]
[Close Controller, Go Back - 06]
[53 - Parking Brake]
[Basic Settings - 04]
Group 020
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The status of the Longitudinal Acceleration Sensor (G251) is now being displayed.
[Done, Go Back]
To make sure the basic setting was successful, check the sensor again.
[Close Controller, Go Back - 06]
[03 - Brake Electronics]
[Measuring Blocks - 08]
Group 004
[Go!]
Check field 4, the value has to be between -2.5 and +2.5 m/s².
[Done, Go Back]
[Close Controller, Go Back - 06]
Replacement
After Replacing this Control Module these Steps have to be performed in the following Order:
- Code Brake Electronics (J104) Control Module
- Basic Setting for Steering Angle Sensor (G85)
- Basic Setting for Lateral Acceleration Sensor (G200)
- Basic Setting for Brake Pressure Sensor 1 (G201)
- Basic Setting for Longitudinal Acceleration Sensor (G202)
- Basic Setting for Longitudinal Acceleration Sensor (G251)
- Code Parking Brake Electronics (J540) Control Module
- Perform Parking Brake Function Test
In case you are having trouble with procedure please contact us directly and we will assist you with the Coding Process. Every inquiry on this topic has to include a full Auto-Scan as well as which parts have been replaced and why, also make sure the Auto-Scan includes the complete VIN of the vehicle in question.
Video Link
Electro-Mechanical Parking Brake (EPB), Rear Brake Service
