Hydraulic Unit Overview
WARNING:
- Always disconnect the battery ground strap.
- When removing and installing the brake lines, make sure the lines are marked and installed according to the identification on the ABS hydraulic unit.
- Install only original factory made, pre-formed brake lines refer to the Parts Information
- Close brake lines and connections immediately with plugs. Brake line tightening torque is 15 Nm (11 ft lb).
- After completing any work that requires opening the brake hydraulic system, bleed the brake system with brake filling and bleeding device US 1116 or equivalent BRAKE FLUID, BLEEDING .
- In addition, carry out a high- and low-pressure test of the brake system HIGH AND LOW PRESSURE, CHECKING .
- Brake line
- Brake master cylinder to ABS hydraulic unit, bottom rear
- Marking "HA" on ABS hydraulic unit
- Brake line
- Brake master cylinder to ABS hydraulic unit, bottom rear
- Marking "VA" on ABS hydraulic unit
- Brake master cylinder with brake booster
- S4/S6 models have hydraulic brake servo BRAKE MASTER CYLINDER AND HYDRAULIC BRAKE SERVO OVERVIEW
- Brake line
- ABS hydraulic unit to right-front brake caliper
- Marking "VR" on ABS hydraulic unit, top
- Brake line
- ABS hydraulic unit to rear axle
- Marking "HA" on ABS hydraulic unit, top
- Brake line
- ABS hydraulic unit to left-front brake caliper
- Marking "VL" on ABS hydraulic unit, top
- Cover
- Install tightly
- Also retains wiring harness
- ABS solenoid valve relay -J106-
- Starting with VIN..PN 039 805, relay includes a fuse
- When replacing, always use relay with fuse
- Wiring harness
- ABS return flow pump relay -J105- ABS COMBINATION RELAY
- ABS hydraulic unit -N55-WARNING:
- No repairs may be performed on the ABS hydraulic unit except replacement of the two relays. Do not loosen bolt connections.
- Replace the ABS hydraulic unit only as a complete assembly, if necessary.
- High and low pressure testing HIGH AND LOW PRESSURE, CHECKING .
- Ground wire
- Ensure good contact
- Toothed washer
- Washer
- Nut
- 10 Nm (7 ft lb)
- Bushing
- Mounting
- Self-locking nut
- Always replace
- 7 Nm (62 in lb)
- Bracket
- Mount ABS hydraulic unit