Service Bulletin
5.75" Diameter Trailer Axles With
P89® Integral Disc Brakes
ABS Sensor Block Replacement

October 2016

The following instructions provide the necessary information for the
proper replacement of the ABS sensor block on SAF-HOLLAND® P89
INTEGRAL® Rotor Disc Brake Axles. Additional information can be
found in the SAF-HOLLAND® Disc Brake Axle service manuals
(XL-SA20018UM-en-US for P89, XL-SA20024-en-US for P89 Plus).

3.

NOTE: Before beginning any axle/brake service procedures,
park the vehicle on a level surface. Block the wheels
to prevent the vehicle from moving. Support the
vehicle and axle(s) with safety stands. DO NOT work
under a vehicle supported only by jacks.

4.

Failure to properly support the vehicle and
axles prior to commencing work could
create a crush hazard which, if not avoided,
can result in death or serious injury.

Cover the spindle with plastic sheeting or a large plastic bag to
prevent metal chips from contaminating the spindle grease.

NOTE: If any metal shavings contaminate the spindle grease
or spindle seal, the seal MUST be removed and the
spindle MUST be thoroughly cleaned.
Clearly mark the centerline of the damaged ABS sensor block
on the Axle (Figure 1).

IMPORTANT: These marks are needed in step 6 to properly
position the replacement ABS sensor block.

Figure 1

The following parts are provided in the SAF-HOLLAND® P89/
P89 Plus ABS sensor block replacement kit. One kit contains
all parts required for one wheel end:
SAF-HOLLAND® ABS SENSOR BLOCK REPLACEMENT KIT
ITEM

PART NUMBER

1
2
3
4a
4b
5
6

04029107100Z
04029107200Z
2001100000070
01092003100Z
2024100000120
01093002300Z
04387002918

DESCRIPTION

QTY

ABS Sensor
ABS Sensor Clip
ABS Sensor Block
Spindle Seal (P89)
Spindle Seal (P89 Plus)
hub Cap Gasket
Spindle Grease (P89 Plus)

1
1
1
1
1
1
1

P89/P89 Plus INTEGRAL® ABS Sensor
Block Replacement
1.

Remove the head unit. Refer to Section 7 of the XLSA20018UM-en-US for the P89. Refer to Section 8 of the
XL-SA20024UM-en-US for the P89 Plus.

2.

Remove the hub spindle seal.

XL-SA20030SB-en-US · 2016-10-03 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF,
and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.

Service Bulletin
5.

Remove the damaged ABS sensor block using a suitable
abrasive cutoff tool and/or an air chisel (Figure 2).

Figure 3

IMPORTANT: DO NOT use an oxi-acetylene torch.
DO NOT cut into the axle body.
DO use an appropriate sized abrasive cut off
tool to weaken one weld (Figure 2).
Completely remove the damaged ABS sensor block using an
air chisel (Figure 3).
Remove the remainder of the damaged ABS sensor block
using a hand grinder with a 60 or coarser grit flexible
sanding disc (Figure 4).
IMPORTANT: DO NOT remove excessive axle material.
6.

Connect the ABS sensor block center line marks made in Step
4 above and mark a line 2 3/4" ± 1/16" (70 ± 2 mm) from
the spindle shoulder (Figure 5).

Figure 2

Figure 4

CUTOFF TOOL

Figure 5
WEAKENED WELD
SHOULDER

2 3/4" (70 mm)

XL-SA20030SB-en-US · 2016-10-03 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF,
and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.

2

Service Bulletin
7.

Center the replacement ABS sensor block on the line marked
in step 4 and 6. Line it up with the 2 3/4" (70 mm) mark
made in step 6. Using appropriate welding gloves, hold it
firmly in place and tack it in place on both sides (Figure 6).

8.

Weld both sides with a 3/16" fillet weld. DO NOT weld
around the ends of the ABS sensor block (Figure 7).

9.

Reinstall the head unit on the spindle using the appropriate
new spindle seal (01092003100Z for P89, 2024100000120
for P89 Plus(Figure 8)), reinstall the wheel end components.
Refer to instructions detailed in Section 11 of XL-SA20018UMen-US for P89, Section 8 of XL-SA20024UM-en-US for P89 Plus.

Figure 6

NOTE: For P89 Plus, Item 6, 04387002918 spindle grease, must
be applied to the spindle bearing journals.

Figure 7

Figure 8

P89
01092003100Z

3

P89 PLUS
2024100000120

XL-SA20030SB-en-US · 2016-10-03 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF,
and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.

Service Bulletin
10. Re-Install the ABS sensor and retaining clip (Refer to instructions detailed in Section 16 of XL-SA20018UM-en-US for P89,
Section 10 of XL-SA20024UM-en-US for P89 Plus). Rotate the
wheel end and ensure there is no interference between the
rotor attachment bolts and the ABS sensor block and sensor
(Figure 9):

Figure 9

11. Reinstall hub cap using new hub cap gasket 01093002300Z,
refer to Section 13 of XL-SA20018UM-en-US for P89, Section
8.2 of XL-SA20024UM-en-US for P89 Plus Disc Brake Axle
service manuals.
NOTE: If the P89 hub lubrication medium is oil, lubrication
procedures will occur after hub cap installation.
12. If the P89 hub lubrication medium is oil, refer to Section 12
of XL-SA20018UM-en-US Disc Brake Axle service manual for
lubrication instructions.
13. Reinstall the caliper according to Section 14 of the XLSA20018UM-en-US for P89, Section 8.2 of XL-SA20024UMen-US for P89 Plus Disc Brake Axle service manuals.
14. Adjust the brakes.
Refer to Section 5 of XL-SA20018UM-en-US P89 Disc
Brake service manual to determine whether your
SAF-HOLLAND® trailer axle is fitted with Knorr Bremse
SK7 calipers, or with SAF-HOLLAND® SBS 2220 K0 calipers.
For Knorr-Bremse SK7 Calipers adjustment procedures
refer to the Knorr/Bendix® SK7 caliper service manual
Y006474 which can be found at www.knorr-bremsecvs.
com under documentation.
For SAF-HOLLAND® SBS 2220 K0 adjustment procedures
refer to SBS 2220 K0 service manual XL-SA40001RM-enDE which can be found at www.safholland.com.
15. Check the brake for proper application and release.

XL-SA20030SB-en-US · 2016-10-03 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF,
and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.

4