![](../../../img/35/AC000870AE00ENG.png)
![](../../../img/35/AC000871AE00ENG.png)
![](../../../img/35/AC000872AE00ENG.png)
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1.For simple checking of the
brake booster operation, carry out the following
tests: (1)
Run the engine for one or two minutes, and then stop it. If
the pedal depresses fully
the first time but gradually becomes higher when depressed
succeeding times, the booster is operating
properly. If the pedal height remains unchanged, the booster
is defective. Go to step 2. (2)
With the engine stopped, step on the brake pedal several
times. Then step on the brake
pedal and start the engine. If the pedal moves downward
slightly, the booster is in good condition.
If there is no change, the booster is defective. Go to step
3. (3)
With the engine running, step on the brake pedal and then
stop the engine. Hold the pedal
depressed for 30 seconds. If the pedal height does not
change, the booster is in good condition,
if the pedal rises, the booster is defective. 2.If
the above three tests are okay, the booster is OK. If one of
the above three tests
is not okay, the check valve, vacuum hose, or booster is
defective. Check the check valve (Refer
to ), vacuum
hose for leaks, high volume engine vacuum applied
to booster. Repair or replace as necessary. If these are OK,
replace the booster and repeat
this test starting at Step 1.
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