SERVICE BRAKES On-vehicle Service
Judgement in Inspection by Using Brake Force Tester
No.
04
05
Scan tool
display
VALVE
M
FL VALVE
M
REAR
VALVE
M
Operation
After brake force
tester indication
has stabilized,
operate scan
tool to force the
actuator to oper-
ate and check
the change in
brake force.
Table 1: Change in brake force
Front wheels:
N
1,000 (220)
Step 1
Step 2
(In approx. 6 s)
1,000 200 (220 44)
Rear wheels:
650 (143)
Step 1
Step 2
(In approx. 6 s)
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.
Abnormal
Probable
condition
cause
Brake force in
Step 1 shows very
little or almost no
decrease.
Brake force de-
creases in Step 1
but in Step 2, it
shows very little or
almost no in-
crease.
Increasing brake
pedal depression
force increases
brake force.
Incorrect HU
brake tube
connection
Faulty HU
Clogged
brake line
other than
HU
Faulty HU
Fluid leaking
in HU
(poor seal-
ing)
Remedy
Connect
correctly
Replace HU
assmbly
Check and
clean brake
line
Replace HU
assmbly
Replace HU
assembly
NOTE
(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
Содержание 1992 3000GT
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