Mitsubishi 3000GT Service Manual page 905

Judgement in Inspection by Using Brake Force Tester
Scan tool
No.
Operation
display
04 After brake force
M tester indication
has stabilized,
operate scan
tool to force the
actuator to oper-
ate and check
05 FL VALVE
the change in
M
brake force.
REAR
VALVE
M
Table 1: Change in brake force
Front wheels:
Step 1
Step 2
Rear wheels:
Step 1
Step 2 (In approx. 6 s)
SERVICE BRAKES - On-vehicle Service
Normal
condition
1) Brake force
changes as
shown in Table
1 after actuator
is forced to
drive with a
scan tool.
2) Immediately af-
ter checking
Step 2 value
(in approx. 3
s), increasing
brake pedal de-
pression force
does not in-
crease brake
force.
NOTE
N (la.)
(1) During forced drive using the scan tool, forced drive operation
is stopped when any wheel speed reaches 10 km/h (6 mph).
(2) Failure to keep the brake pedal depression force constant can
result in misjudgement.
Even if the judgement has resulted in NG, it might be that
the depression force was not kept constant. Therefore, repeat
the same check again as necessary.
(3) The probable causes given above all assume that all the other
brake parts are normal.
TSB Revision
Abnormal
Probable
condition cause
Brake force in
Incorrect HU
Step 1 shows very brake tube
little or almost no connection
decrease.
Faulty HU
Brake force de- Clogged
creases in Step 1 brake line
but in Step 2, it other than
shows very little or HU
almost no in-
Faulty HU
crease.
Increasing brake Fluid leaking
pedal depression in HU
force increases (poor seal-
brake force.
ing)
Remedy
Connect
correctly
Replace HU
assmbly
Check and
clean brake
line
Replace HU
assmbly
Replace HU
assembly