Brake pads, removing and installing
Special tools, testers and auxiliary items required
- Torque wrench V.A.G 1331/
- Torque wrench V.A.G 1332/
- Piston resetting tool T10145
- Interchangeable Head T40036
- Vehicle Diagnosis, Testing and Information System VAS 5051
Removing
NOTE:
- When removing, mark brake pads that will be used again. Install in the same position, otherwise braking effect will be uneven!
- Operating the electromechanical parking brake after a long drive is recommended.
- Pad play is automatically adapted approximately every 1000 km.
- Set vehicle to vehicle lift mode. → 43 - Self Leveling Suspension
- Raise vehicle.
- Remove wheels.
CAUTION:
If brake pads are ceramics, wheel must not fall on brake disc, otherwise it will be irreparably damaged. To remove/install wheel, insert two assembly pins in wheel bolt mount. The long assembly pin is in the upper position.
- With ignition switched off, connect Vehicle Diagnostic, Testing and Information System VAS 5051 with Diagnostic cable, 3 m with voltage supply VAS 50511 to 16-pin vehicle Data Link Connector (DLC) and select parking brake with "Address word" 53.
NOTE:
- Ignition on
- Release parking brake
- Coding check and reported if necessary.
- DTC memory interrogated, errors shown corrected and DTC memory erased.
Shown on VAS 5051 display:
- Select function "53 - Parking brake".
- Select function "04 - Basic setting".
Fig 4: Identifying Diagnostic Operation System VAS 5051A (Prompt For Entering Display Group Appears In Display Zone & Input Keypad Appears In Display Zone)
Shown on VAS 5051 display:
- The request to enter a display group number appears in display field - 1 -.
- An entry keypad is shown in display field - 2 -.
When installing new brake pads
- Using entry keypad, enter in display field - 2 - the "05" or "005" for "Display group number one and confirm by pressing " Q button. (Reset pistons)
When re-installing old brake pads
- Using entry keypad in display field - 2 - , enter "07" or "007" for "Display group number one and confirm by pressing " Q button. (brake opens completely, pad thickness does not need to be entered later)
Affects all vehicles
- Remove attachment bolts from brake caliper housing, to do so counter-hold guide pins.
NOTE:
- Actuator or brake system connector must not be disconnected.
- Slide connector out of bracket
- Remove brake caliper sideways
- Remove brake pads
- Remove guide clamps
NOTE:
- It is possible to change brake discs with brake carrier installed.
- Press pistons back using Piston Resetting Tool T10145
Installing
Clean brake caliper with mineral spirits exclusively.
- Insert brake pad retaining springs
- Insert brake pads.
- Make sure that the brake pads are located correctly in anti-rattle springs - arrows -.
- Secure brake caliper housing using new self-locking bolts.
NOTE:
- The repair kit includes four self-locking hex bolts which must be installed in all cases.
- Install electronic parking brake connector in bracket.
Fig 13: Identifying Diagnostic Operation System VAS 5051A (Prompt For Entering Display Group Appears In Display Zone & Input Keypad Appears In Display Zone)
Shown on VAS 5051 display:
- The request to enter a display group number appears in display field - 1 -.
- An entry keypad is shown in display field - 2 -.
- Using entry keypad, enter in display field - 2 - the "06" or "006" for "Display group number one and confirm by pressing " Q button. (guide pistons together)
- Press left Arrow button to leave basic setting.
When installing new brake pads
Fig 14: Identifying Diagnostic Operation System VAS 5051A (Prompt For Entering Display Group Appears In Display Zone & Input Keypad Appears In Display Zone)
Shown on VAS 5051 display:
- The request to enter a display group number appears in display field - 1 -.
- An entry keypad is shown in display field - 2 -.
- Press left arrow button 2 times
Shown on VAS 5051 display:
- Selection function "10 - Adaptation"
- Measure thinner brake pad without backing plate and enter value using keypad or scroll bars.
- Select keypad or enter via scroll bars
- Enter min - max value, between 10-23 mm using entry keypad in display field - 2 -.
- Confirm by pressing Q button (guide pistons together)
- Select Save and then Transfer.
When re-installing used brake pads, procedure is changed
Fig 16: Identifying Diagnostic Operation System VAS 5051A (Prompt For Entering Display Group Appears In Display Zone & Input Keypad Appears In Display Zone)
Shown on VAS 5051 display:
- The request to enter a display group number appears in display field - 1 -.
- An entry keypad is shown in display field - 2 -.
- Using entry keypad, enter in display field - 2 - the "05" or "005" for "Display group number one and confirm by pressing" Q button.
- Install wheels → 44 - Wheels, Tires and Wheel Alignment
- Check brake fluid level and top off if necessary.
NOTE:
- The electronic parking brake must now be re-calibrated.
Requirements
- Electronic parking brake must be released.
- Selector lever must be in "P" position.
- Switch ignition off, remove ignition key and lock steering wheel lock.
The re-calibration is performed.
- The electronic parking brake audibly travels up and back down.
- The air gap adjusts itself.
- Wait until this process is completed.
The re-calibration is now finished.
The DTC memory is then erased.