Chery T21 2014 Service Manual page 1193

Vacuum Booster with Brake Master Cylinder Assembly
On-vehicle Inspection
1. Check vacuum booster assembly.
a. Air tightness check.
 Start engine and stop it after 1 or 2 minutes. Slowly depress brake pedal several times.
 Make sure that booster is airtight. Check that distance every time the pedal depressed is gradually
decreased compare to the previous operation.
If pedal operation is not as specified, check the check valve. If check valve is normal, replace the
vacuum booster assembly.
 Start engine. Depress and hold pedal, then stop engine.
 Make sure that booster is airtight. Depress and hold pedal for 30 seconds, and check that pedal
reserve distance does not change.
If pedal operation is not as specified, check the check valve. If check valve is normal, replace the
vacuum booster assembly.
b. Operation check.
 Stop engine.
 Depress pedal several times and check that pedal
reserve distance does not change.
 Depress and hold pedal, and then start engine.
Check that pedal can only be depressed lightly.
If pedal operation is not as specified, check the
check valve. If check valve is normal, replace the
vacuum booster assembly.
Chery Automobile Co., Ltd.
26 - BRAKE
RT21260160
RT21260170
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