BMW 7 Series: Brake Testing And Bleeding
BLEEDING BRAKE SYSTEM WITH DSC
Necessary preliminary work
- Remove left sensor opening
- Read and comply with GENERAL INFORMATION.
IMPORTANT: When replacing or repairing, observe the filling and bleeding instructions for the following parts:
- Tandem brake master cylinder
- Hydraulic unit
- Components and lines which are fitted between these assemblies.
Connect bleeder unit with max. 2 bar filling pressure.
A second person is needed to help carry out this work.
Only use brake fluids that have been approved by BMW, see BRAKE SYSTEM - OPERATING FLUIDS.
Connect DIS (BMW scan tool).
Select path: Service functions - Chassis and Suspension - Traction control system - Bleeding procedure.
IMPORTANT: Check relevant equipment manufacturer's operating instructions for each device.
Charging pressure should not exceed 2 bar.
Connect bleeder unit to expansion tank and switch on.
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Fig. 1: Connecting Bleeder Unit To Expansion Tank
Fully rinse the brake system
Connect vent hose with collecting vessel to vent valve on rear right brake caliper.
Open vent valve and purge until clear, bubble-free brake fluid emerges.
Close vent valve.
Follow same procedure on rear left, front right and front left wheel brake.
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Fig. 2: Locating Vent Valve On Rear Right Brake Caliper (1 Of 2)
Bleeding rear axle brake circuit
Connect vent hose with collecting vessel to vent valve on rear right brake caliper.
Open vent valve.
Run bleeding procedure with DIS with vent valve open.
After completing routine, press brake pedal 5 times to floor; clear and bubble-free brake fluid must flow out.
Close vent valve.
Repeat procedure at rear left.
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Fig. 3: Locating Vent Valve On Rear Right Brake Caliper (2 Of 2)
Bleeding front axle brake circuit
Connect vent hose with collecting vessel to vent valve on front right brake caliper.
Open vent valve.
Run bleeding procedure with DIS with vent valve open.
After completing routine, press brake pedal 5 times to floor, clear and bubble-free brake fluid must flow out.
Close vent valve.
Repeat procedure at front left.
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Fig. 4: Connecting Vent Hose With Collecting Vessel To Vent Valve
Switch off bleeder unit and remove from expansion tank.
Check brake fluid level. If necessary, top up/draw off to "MAX" level.
Close expansion tank.
NOTE: Pay attention to gasket (1) in sealing cap.
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Fig. 5: Identifying Gasket And Brake Fluid Level
READ NEXT:
Checking Brake Discs
Necessary preliminary tasks
Remove WHEELS.
Checking thickness difference:
Measure thickness difference within brake surfaces at 8 point (spread
over the circumference) with a
micrometer gauge
Replacing Fluid In Brake System
Necessary preliminary work
Remove left sensor opening
Read and comply with GENERAL INFORMATION.
IMPORTANT: When carrying out repairs to the brake system, follow the
procedure set out in BLEEDING
Front Brakes
CHECKING BRAKE DISCS
Necessary preliminary tasks
Remove WHEELS.
Checking thickness difference:
Measure thickness difference within brake surfaces at 8 point (spread
over the circumference) with
SEE MORE:
Electromechanical Parking Brake (EMF)
General details
The electromechanical parking brake (EMF) is applied/released by means of the
parking brake button on the
center console control panel. The parking brake status is indicated by the
function indicator lamp on the button
and an indicator lamp on the instrument cluster.
Fig. 78: Inst
Removing And Installing/Renewing Dynamic Drive Expansion Hose
Part 2 (In Front Wheel Arch)
Notes
WARNING: DANGER OF POISONING if oil is ingested/absorbed through the
skin!
RISK OF INJURY if oil comes into contact with eyes and skin!
IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to
enter the hydraulic
system.
Do not draw off hydraulic fluid (risk of contamination).
