Hydroaggregate Press. Build - BMW 745i Repair Instructions

10 ABS
BMW '7' series cars
Hydroaggregate press. build
A, B S control unit No.
0265100002
Volt. betw. leads 1 1
+
10
>
10,8V Display on brake dynamometer (BPS):
see test sequence
Front left
right
left/right 3s
4.2000 N (both wheels), diff. between
wheels < 400 NI
5. Display reading drops: front and rear
axles: < 500 N
1
After this, reading at front:
600 N ... 1450 N
Rear left
right
left/right
3s
At rear: 600 N .. , 1350 N
Important: keep pedal force uniform
Brake dynamometer (BPS) display
must not vary by more than 150 N
I
within 3 s; initial braking force is dis·
I
played by pressing
Test
1. Switch off the ignition. Connections needed: T·plug at ABS wiring harness and at ABS
sequence: control unit
2. With front axle on brake dynamometer and • flashing on tester, set to FRONT UR at
rn
3. Switch on ignition. Note voltage between leads 1 and 10 (run engine at idle speed If neces·
sary). Switch on brake dynamometer (BPS) for both wheels .
4. Apply brakes until brake dynamometer reading is 2000 N (left and right), and maintain this ,
pedal force steadily
5. Press
~
. After 2 s the pump will cut in, the valve will be opened for app. 4 s and moved
to the retention phase after a short period of pressure buildup, and the's' display will start
to run . When 3 s are displayed, press
~
6. To repeat, press ~ . To move on to next wheel, press
[!)
Test positions: FRONT UR,
REAR lIR in any desired order. .
."...,--::-.:-::-::-.:-""1:':-:-:.-:-=--=-=:==:-------
III
nominal values are not reached: check battery, perform test steps 05·0"6/01, check hydro·aggregate.
Further information on workshop manual microfiche, Group 34, job No. 34 51 520; Troubleshooting - ABS