Function Check
▪ While connected with the RaceABS software switch to the “Testing” page.
Check all sensors for plausibility and proper function. Delete the balance
bars. Press brake pedal: brake switch bit should toggle between 0 and 1, the
display “Pressure sensor” should show a logical value. Check sensor and bal‐
ance bar, if the brake switch doesn’t toggle. Rotate ABS map switch, the val‐
ue “Multiswitch” should turn up clockwise. Manually move yaw/accelerome‐
ter sensor to the right and left as well as to the front and rear. The “Ax” and
“Ay”‐values should increase positive or negative analogue to the Tilt. See sec‐
tion Testing [} 30].
▪ Put the car on jack stands so all wheels can be freely rotated. While connec‐
ted with the RaceABS software and viewing the "Testing" page, rotate each
wheel and verify the correct wheel speed responds in the "Testing" page, see
section Testing [} 30].
▪ Click "Pump On" button on the “Testing”‐page. The pump now runs for 10
seconds or until you press the button again. After the pump shuts off, an as‐
sistant hold the brake pedal down (Please check: all wheels have to be
locked!) Next, while the assistant still holds brake pedal down, click the "Re‐
lease Brake" button for a given wheel (one at a time). Verify that brake relea‐
ses at that wheel by rotating the wheel before clicking the next button. Re‐
peat for each wheel.
Notice
During this release test, the pump may switch on repetitively.
See chapter: Testing [} 30]
▪ On the "Testing" page now decide between the "Repair Bleeding (Tandem
MC)" and “Repair Bleeding (Balanced Bar)”. Click on the button “Start wizard”
at the bottom right. Follow the instructions listed in the sub window in order
to bleed the ABS hydraulic unit.
Notice
This will bleed the ABS hydraulic unit only, not the brake lines
or the wheel brake cylinders.
See chapter: Repair Bleeding Wizard [} 33]
▪ Bleed brakes in normal fashion, starting with the furthest brake from the
master cylinder and finishing with the nearest. Check errors one last time, di‐
agnosis any errors present, then disconnect MSA Box II from ABS harness.
Once MSA Box II is disconnected verify that MIL lamp turns off and stays off.
▪ Check for proper brake operation at low speeds first. Start with ABS map
switch in a neutral position (position 5 to 7).
Notice
Refer to manual for more information regarding the ABS map
switch position function. See chapter: ABS in Motorsport [} 5]
and Features [} 6].
▪ ABS warning light (MIL) on for a short time when you switch on the ignition,
on permanent when map switch in position 12 (OFF).
Appendix | 10
Bosch Motorsport ABS M4 Manual 39 / 54
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