Chery QQ, Service Manual

Page: 217 / 635

Chery QQ Service Manual Chassis System
4) Stroke of brake pedal
The excessively short stroke of
the brake pedal is mostly caused by
the action of the air inside the
braking system. Discharge the air
inside the system until all the air
is discharged completely. Refer to
the “Air Discharge for Hydraulic
Systems” for more details. The
reasons uncommonly seen to cause the
excessively long stroke of the brake
pedal are as follows:
Excessive tears and wears of the
friction lining
Leakage in the hydraulic system
Make regular and periodic
measurements of the brake pedal
strokes, which refer to the distances
for the pedal to move from a
completely released position to the
floor.
5). Braking liquid leakage
Leave the engine in idle running
operation and leave the transmission
shaft at the
“
idle gear
”
position.
Step on the brake pedal and keep the
stepping force unreplaced. If the
pedal is lowered slowly under the
unreplaced force, it means there
might be leakage in the hydraulic
system. Make the following visual
checks to see if there is any leakage:
Check the liquid level inside the
main pump liquid storage tank of
the braking system. Normal tears
and wears of the friction lining
will lead to the slight lowering of
the liquid level in the storage
tank. If the liquid level is too
low, it will cause the brake
alarming indication light to be on,
which means there might be
internal or external leakage for
the hydraulic system.
Check to see if there is any
leakage at the joints of the
braking pipe and the braking tube.
Check the torque of the fastening
parts or replace the oil pipe and
tube.
Check to see if the components
connecting the brake are damaged
or not. Replace the components if
needed.
Check to see if there is any
leakage at the protection cover of
the clamp and wheel cylinder. If
any, replace the parts as needed.
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Chery Automobile Co., Ltd