Brake Control System and Diagnosis: 4A-10
Flushing Brake Hydraulic System
S5JB0A4106009
It is recommended that entire hydraulic system be
thoroughly flushed with clean brake fluid whenever new
parts are installed in hydraulic system.
Periodical change of brake fluid is also recommended.
Booster Operation Check
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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.
Inspection without Tester
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.
[A]: Good 2. 2nd
1. 1st 3. 3rd
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I5JB0A410008-01
[B]: No Good 1. 1st, 2nd, 3rd
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IYSQ01410018-01
IYSQ01410019-01
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