Overview - Front Brakes, Four-Piston Brake

Fig 1: Exploded View Of Front Brakes, Four-Piston Brake

Courtesy of AUDI OF AMERICA, LLC

1. Brake Shield
   • Refer to BRAKE SHIELD, REMOVING AND INSTALLING 
2. Wheel Bearing Housing
3. Bracket
   • For brake hose and wire
4. Bolt
   • 20 Nm
5. Hose Bracket
   • for brake hose
6. Brake Hose
   • Make sure the brake hose is routed correctly. Make sure the brake hose is not blocked, bent, twisted or rubbing against the vehicle.
   • Replace if damaged
   • Make sure that tabs are properly seated in the grooves on the bracket.
   • Brake hose to brake caliper tightening specification: 14 Nm
7. Hose Bracket
   • Replace if damaged
8. Bracket
   • For the brake line/hose
   • On the body
9. Spring
   • Replace if damaged
10. Brake Line
    • Do not change the bending shape.
    • Replace a damaged or bent brake line
    • Brake line to brake hose tightening specification: 14 Nm
11. Bolt
    • 200 Nm
12. Brake Pad Wear Indicator Wire
    • For the left inner brake pad with the Left Front Brake Pad Wear Sensor -G34-
    • Replace when replacing the pads
    • Refer to BRAKE PAD WEAR INDICATOR WIRE, REMOVING AND INSTALLING 
13. Anti-Friction Plate
    • Installation position. Refer to Fig 2.
14. Protective Cap
15. Bleed Screw
    • Refer to HYDRAULIC SYSTEM, BLEEDING
    • 18 Nm
16. Spring Bracket
    • Installing. Refer to Fig 4.
17. Brake Caliper
    • Allocation. Refer to the appropriate Electronic Parts Information.
    • Refer to BRAKE CALIPER, REMOVING AND INSTALLING, FOUR-PISTON BRAKE 
    • Refer to BRAKE CALIPER, REPLACING, FOUR-PISTON BRAKE 
    • Servicing. Refer to BRAKE CALIPER PISTON, REMOVING AND INSTALLING, FOUR-PISTON BRAKE .
18. Anti-Friction Plate
    • Installation position. Refer to Fig 2.
19. Brake Pads
    • Allocation. Refer to the appropriate Electronic Parts Information.
    • Inner brake pads with a mount for the brake pad wear sensor
    • Check the pad thickness. For the wear limit, refer to BRAKE PADS, CHECKING THICKNESS
    • Always replace on both sides of the axle.
    • Refer to BRAKE PADS, REMOVING AND INSTALLING, FOUR-PISTON BRAKE 
    • Refer to Fig 3
20. Brake Rotor
    • Allocation. Refer to the appropriate Electronic Parts Information.
    • Wear limit specified on the brake rotor
    • Refer to BRAKE ROTOR, CHECKING, STEEL BRAKES
    • Always replace on both sides of the axle.
    • When replacing the brake rotors, also replace the brake pads.
    • Refer to BRAKE ROTOR, REMOVING AND INSTALLING, STEEL BRAKES 
21. Bolt
    • 8 Nm
22. Bolt
    • 10 Nm

Anti-Friction Plates Installation Position A

Fig 2: Anti-Friction Plates Installation Position -A-

Courtesy of AUDI OF AMERICA, LLC

• Insert all four anti-friction plates -A- into the brake pad contact surfaces as shown.
• Anti-friction plate installation position: the small narrow tab faces the brake caliper.
• Make sure the installation position is correct before installing the brake pads.

Installation position of the four-piston brake brake pads

Fig 3: Brake Pad Installation Position

Courtesy of AUDI OF AMERICA, LLC

1. Inner brake pad with groove -arrow- for brake pad wear indicator sensor
2. Outer Brake Pad

-- Clip the brake pads with the springs into the brake caliper pistons.

Spring Bracket, Installing

Fig 4: Spring Bracket, Installing

Courtesy of AUDI OF AMERICA, LLC

-- After inserting the brake pads -2-, slide the spring bracket -1- onto the brake pads through the eyes and let it engage into the mount.

• The spring bracket must engage audibly and noticeably in the mount in the brake caliper.