![](../../../img/35/AC000870AC00ENG.png)
![](../../../img/35/AC000871AC00ENG.png)
![](../../../img/35/AC000872AC00ENG.png)
|
1.Carry out the simplified
brake booster operation check in the following
procedure: (1)
Run the engine for 1 to 2 minutes, and then stop. Depress
the brake pedal with normal depression force. The result is
judged as "Good" when the pedal stroke is great at the first
depression, and becomes smaller as you repeat depressing the
pedal. If the pedal stroke does not change, the result is
judged as "No Good." (2)
With the engine stopped, depress the brake pedal several
times. Keep the brake pedal depressed and start the engine.
At this time, when the pedal moves down slightly, the result
is judged as "Good." The result is judged as "No Good" if
the pedal does not move down. (3)
With the engine running, depress the brake pedal. Stop the
engine in this condition. The result is judged as "Good"
when the pedal height does not change for approximately 30
seconds. The result is judged as "No Good" if the pedal
moves up. 2.The brake booster is judged as normal
when the results of all the above checks are "Good." When
one or more of the above check results are "No Good," then
the check valve, vacuum hose, or brake booster is suspected
faulty.
|
|
1.Before starting this
inspection, remove the brake booster check valve from the
vehicle and check its operation (Refer to
<LHD>,
<RHD>).
|
|
2.Connect a vacuum gauge
between the vacuum hose (incorporating the check valve) and
the brake booster.
|
![](../../../img/35/ACB03686AC00ENG.png)
|
3.Connect a pressure gauge
and a pedal depression force gauge as shown. Air-bleed the
pressure gauge and then follow the procedure below: (1)
Airtightness test with no load Start the engine, and stop
it when the vacuum gauge indicator has reached approximately
-67 kPa. The result is judged as "Good" when the drop
of the vacuum approximately 15 seconds after the engine was
stopped is within -3.3 kPa. (2)
Airtightness test with load Start the engine and depress
the brake pedal with 200 N. Stop the engine when the vacuum
gauge indicator reached approximately -67 kPa. The
result is judged as "Good" when the drop of the vacuum
approximately 15 seconds after the engine was stopped is
within -3.3 kPa. When one or more of the above
check results are judged as "No Good," the vacuum hose or
brake booster is suspected faulty. (3)
Brake booster characteristics test Perform this test
after the above (1) and (2) were performed. .....1.
Non-servo effect test With the engine stopped, make sure
that the vacuum gauge reading is 0 kPa. Depress the brake
pedal with 100 N and 300 N, and measure the fluid pressure
generated. Standard value:
|
Item
|
Pedal
depression
force
|
100
N
|
300
N
|
Generated fluid
pressure kPa
|
0 -
560
|
2,060 -
2,860
|
|
.....2.
Servo effect test Start the engine. Depress the brake
pedal with 100 N and 300 N when the vacuum gauge indicator
reached approximately -67 kPa, and measure the fluid
pressure generated. Standard value:
|
Item
|
Pedal
depression
force
|
100
N
|
300
N
|
Generated fluid
pressure kPa
|
3,970 -
5,970
|
8,800 -
10,730
|
|
|