Removing and Installing / Replacing Hydraulic Unit ABS/ASC+T

Note: Follow general instructions.
Before starting work, read out fault memory of ABS/ASC+T control module and print out diagnostic record.
After completing work, carry out function test on ABS/ASC+T unit.
After completing work, bleed brake system.

Remove end firewall.





Remove seal (1) towards top.





Remove vacuum line and B + line from assembly compartment partition wall.
Turn seals (1) through 90° and thus unlock. Remove assembly compartment partition wall (2) towards top.
Installation: When installing the vacuum line and B + line, ensure rubber grommets are correctly seated.
Remove master brake cylinder.





Detach lines (16), seal connection bore with plugs.
V) From THZ circuit V to ABS/ASC+T unit circuit V (front axle circuit)
H) From THZ circuit H to ABS/ASC+T unit circuit H (rear axle circuit)
FR) From ABS/ASC+T unit VR to wheel brake front right
FL) From ABS/ASC+T unit VL to wheel brake front left
HR) From ABS/ASC+T unit HR to wheel brake rear right
HL) From ABS/ASC+T unit HL to wheel brake rear left
Installation:
Brake hose couplings
M10x1 18 ± 1 Nm
M12x1 18 ± 1 Nm






Unfasten plug connection (1) and disconnect.
Remove brake lines with rubber grommet from metal body and press in direction of engine. Do not under any circumstances bend brake lines.
Release hexagon screw (2) and remove ABS/ASC+T unit towards top.
Installation: Ensure that rubber grommet is correctly seated when installing brake lines.





Installation: Check rubber mount (1) for correct seating. Replace damaged rubber mount.





Replacing hydraulic unit
Release screws (1) and carefully detach control module (2) from hydraulic unit (3).
Installation: Replace micro-encapsulated screws.
Control unit on hydraulic unit
E46 (MK20) 2.6 Nm
E46 (MK60) 5 Nm
(4WD) 2.9 Nm






Release screws (1).





Release screw (1) and remove bracket (2) from hydraulic unit (3)