BMW 3 (E46). Manual — part 172
connect BMW Diagnosis and
Information System (DIS) to 20 pin
Data Link Connector (DLC) under
hood (1999 models), or 16 pin
DLC/OBD II connector under dash
(2000- 2001 models). Call up
service function Bleeding
ABS/ASC or service function
Bleeding ABS/DSC, depending on
which system the vehicle is
equipped with.
-
Connect pressure bleeding device
to brake fluid expansion tank and
pressurize.
CAUTION!
Do not exceed a pressure of 2 bar (29
psi) when pressure bleeding the
brake system. Excessive pressure
will damage the brake fluid reservoir.
Attach bleed hose and fluid receptacle
to bleeder screw (arrow). Open
bleeder screw. Allow DIS bleeding
procedure to cycle hydraulic control
module valves with bleed screw open.
-
After bleeding procedure is
completed, slowly depress brake
pedal (12 times on ABS/ASC
vehicles, 5 times on ABS/DSC
vehicles) with bleeder screw open,
holding pedal down on the last
pump. When escaping fluid is free
of air bubbles, close bleeder
screw and release brake pedal.
CAUTION!
Bleeder hose must always remain
submersed in clean brake fluid
whenever the bleeder valve is open.
-
Refill brake fluid reservoir and
proceed to rear left wheel.
-
Proceed with remaining wheels in
order as listed earlier.
Tightening torques
Bleeder screws (wrench size):
7 mm screw
3.5 - 5 Nm
(2.5 - 3.7 ft-lb)
11 mm screw
12 - 16 Nm
(9 - 12 ft-lb)
340-3
Brake Pads, Calipers,
and Rotors
Brake pads can be replaced without
disconnecting the brake fluid hose from
the caliper or having to bleed the
brakes. The rotors can be replaced
without disassembling wheel hub and
bearing. Always machine or replace
rotors in pairs. Replace pads in sets.
Refer to the accompanying illustration
(previous page) and the detail notes
below during replacement procedures.
WARNING!
Although semi-metallic and
metallic brake friction materials
in brake pads or shoes no
longer contain asbestos, they
produce dangerous dust.
Treat all brake dust as a
hazardous material.
Do not create dust by grinding,
sanding, or cleaning brake
friction surfaces with
compressed air.
Brake pads,
calipers and rotors,
assembly
1
-
Brake caliper
guide bolts
7 mm Allen head
Torque to 30 Nm
(22 ft-lb)
2
-
Brake caliper
Brake line: torque to
18 Nm (13 ft-lb)
See
Caliper
removal
3
-
Brake pad wear
sensor
See
Brake pad
wear sensor
4
-
Brake pad
anti-rattle clip
See
Brake pad
anti-rattle clip
5
-
Brake pads
Replacement
warning at 3.0 mm
(0.11 in.)
See Brake pads
6
-
Front brake
rotor retaining
screw
Torque to 16 Nm
(12 ft-lb)
7
-
Front brake
rotor
Make sure contact
surfaces are clean
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