Nissan Murano: Brake System :: Basic Inspection / Brake Booster
Inspection
VACUUM INSPECTION
Idle the engine for one minute to apply vacuum to the brake booster. Stop the engine. Depress the brake pedal several times at five second intervals until the accumulated vacuum is released to atmospheric pressure. Check that the clearance between brake pedal and dash lower panel gradually increases (A —>B —>C) each time the brake pedal is depressed during this operation.

Depress the brake pedal with the engine running. Then stop the engine while holding down the brake pedal. Check that the brake pedal stroke does not change after holding down the brake pedal for 30 seconds or more.

NOTE:
A slight impact with a small click may be felt on the pedal when the brake pedal is fully depressed. This is normal brake system operation.
OPERATION
Depress the brake pedal several times at five second intervals with the engine stopped. Start the engine with the brake pedal fully depressed. Check that the clearance between brake pedal and dash lower panel decreases.

NOTE:
A slight impact with a small click may be felt on the pedal when the brake pedal is fully depressed. This is normal brake system operation.
Inspection
Check for brake fluid leakage at the following areas:
Master cylinder mounting face
Reservoir tank mounting face
Sub tank mounting face
Brake tube and brake tube connections
Brake hose and brake hose connections
If any brake fluid leakage is found, repair as necessary...
Inspection
Check for uneven wear of the disc brake rotor using a micrometer. Replace the disc brake rotor if the thickness is below the wear limit. Thickness variation (measured at 8 positions)
: Refer to Front Disc Brake...
Other information:
DTC Description
DTC DETECTION LOGICTCM communication blockage lasts for 2 seconds or more when turning ON the ignition switch. (Communication not established.) DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detection condition
U0073
COMM BUS A OFF
(Control Module Communication Bus A Off)
Diagnosis condition
When turning ON the ignition switch
Signal
CAN communication
Threshold
TCM communication blockage (Communication not established)
Diagnosis delay time
Last for 2 seconds or more
POSSIBLE CAUSEHarness or connector (CAN communication line is error)FAIL-SAFE
Selector shock is large
Start is slow
Acceleration is slow
Lock-up is not performed
DTC Confirmation Procedure
PREPARATION BEFORE WORK
If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test...
Exploded View
1.
Center pillar upper finisher
2.
Front door welt
3.
Front pillar finisher
4.
Dash side finisher
5.
Front outer kicking plate
6.
Front inner kicking plate
7.
Center pillar lower finisher
8.
Rear door welt
9...