4A-16 Brake Control System and Diagnosis:
Booster Operation Inspection
S7RS0B4106016
There are two ways to perform this inspection, with and
without a tester. Ordinarily, it is possible to roughly
determine its condition without using a tester.
NOTE
For this check, make sure that no air is in
hydraulic line.
Check Air Tightness
1) Start engine.
2) Stop engine after running for 1 to 2 minutes.
3) Depress brake pedal several times with the same
load as in ordinary braking and observe pedal travel.
If pedal goes down deep the first time but its travel
decreases as it is depressed the second and more
times, air tightness is obtained.
4) If pedal travel doesn’t change, air tightness isn’t
obtained.
NOTE
If defective, inspect vacuum lines and sealing
parts, and replace any faulty part. When this
has been done, repeat the entire test.
Check Operation
1) With engine stopped, depress brake pedal several
times with the same load and make sure that pedal
travel doesn’t change.
2) Start engine while depressing brake pedal. If pedal
travel increases a little, operation is satisfactory. But
no change in pedal travel indicates malfunction.
Check Air Tightness Under Load
1) With engine running, depress brake pedal. Then
stop engine while holding brake pedal depressed.
1. 1st 2. 2nd 3. 3rd
1. 1st, 2nd, 3rd
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I2RH01410006-01
H: Hold
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