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ABS-Control Unit, Remove and Install (ABS 5.3, ABS
5.3 / TC)
Important: Before
undertaking repair work to ABS hydraulic modulator or the control
unit for the ABS hydraulic modulator, it is essential to read the
repair instructions for ABS 5.3, ABS 5.3 / TC, ABS 8.0, ABS 8.0 /
ESP.
 Remove
| 1. |
Remove hydraulic modulator with ABS-control unit 
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| 2. |
Clamp hydraulic modulator in vice with pump motor side
downwards
Note: Use soft metal
protective jaws.
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| 3. |
Unlatch wiring harness plug (1) for pump motor and remove from
the ABS control unit
| • |
Press wiring harness plug carefully out of clamp mounting
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| 4. |
Remove fastening bolts (arrows). Remove ABS control unit from
hydraulic modulator.
Note: Fastening bolts
may not be re-used!
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Install
| 5. |
Check gasket (1) for perfect condition and cleanliness
Note: Check gasket for
cracks, rough surface, notches etc. If the sealing surfaces are
damaged, the ABS control unit must be replaced.
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| 6. |
Clean sealing surface (2) on the control unit carefully with
lint-free cloth
Note: If there are
heavy deposits or gasket residue: soak the cloth in spirits.
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| 7. |
Align the ABS-control unit (3) centrally and place carefully on
the hydraulic modulator (4)
Note: Do not tilt the
ABS-control unit when placing it on the hydraulic modulator!
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| 8. |
Insert new fastening bolts
Note: If the fastening
bolts are difficult to turn while bolting on or it is not possible
to attain the required tightening torque, the assembly is defective
and must therefore be replaced completely.
| • |
Screw in fastening bolts (1) by hand until the bolt heads are
in contact with the ABS-control unit
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| • |
Then screw in the fastening bolts diagonally in several
stages
Note: Until the ABS
control unit is in even contact with the pump housing and the
fastening bolts are only tightened slightly.
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| • |
Screw in fastening bolts (2) and tighten gently by hand
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| • |
Tighten fastening bolts (1) diagonally using MKM-J-6459-B (3) - tightening torque 2.6 Nm
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| • |
Tighten fastening bolts (2), tightening torque 2.6 Nm
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| 9. |
Connect wiring harness plug (1) for pump motor to ABS control
unit
Note: Engaging spring
(2) must engage audibly. Press wiring harness into clamp
mounting.
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| 10. |
Install hydraulic modulator with ABS-control unit
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| 12. |
Check function of brakes and ABS during test drive
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