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Chery S11 / Chery QQ. Manual - part 28

Chery QQ Service Manual Chassis System

Section two Disc brake

1、Specifications

Unit Specifications

Application

Dimension Specifications

Caliper piston diameter

48mm

Brake disc diameter

236mm

Brake disc reject depth comment

16mm

Brake disc minimum depth

17mm

Brake disc process depth

18mm

Brake disc depth new

20mm

Depth deviation

0.01mm

Maximal transverse hop

0.03mm

Maximal transverse hop assembly

0.1mm

Maximal scratch

0.4mm

Brake gasket depth

16mm

Minimum Brake gasket depth

7mm

Application

Torque Specifications

Caliper bolt dowel pin

30N.m

Caliper bracket bolt

95N.m

Caliper linkage brake hosepipe

40N.m

Exhaust valve

8N.m

Front brake disc

6N.m

Cover plate

6N.m

Wheel bolt

110N.m

ABS front sensor bolt

10N.m

Chery QQ Service Manual Chassis System

2.Diagnosis info and procedure

1) Brake disc depth deviation check
Measure brake disc depth in 4 points or
more to check brake disc depth
deviation. Use micrometer to measure
all values on same distance from brake
disc edge.

2) Brake disc transverse hop check
Attention: When removing the disc from
wheel bearing flange, clear the rust or
dirt on the interface of the disc.
Leave wheel on the vehicle to check
transverse hop in order to get more
accurate hop in actual brake condition.
If there are no any wheel check units
on vehicle, remove wheel to check. Keep
the position of caliper to insure exact
readings.
Disassembly procedure
1. Support and lift vehicle.
2. Mark dots on wheel and wheel hub.
3. Remove wheel.
4. Clear surface of the disc.
5. Install and screw wheel nuts.
6. Fix micrometer to steering node.
Must keep the contactor of micrometer
contact with 10mm from edge of surface
of the disc.
7. Set micrometer to zero.
8. Turn wheel a circle. Check the hop
in micrometer. If the hop exceeds 0.1mm,
repair or replace the disc. If total
hop exceeds 0.1mm, adjust or replace
the disc.
Under some conditions, the over
Transverse hop can be improved by
demarcate the position of the disc on
wheel hub. If the hop cannot be
improved in this way, check if the hop
of wheel hub is too big or too loose.
If the hop exceeds 0.05mm, wheel hub

must be replaced. If the hop is
satisfied the request, the brake disc
could be repaired or replaced.
Steps of installation
1. Remove wheel nuts fixing the disc
on wheel hub.
2. Please refer “ Install and

removing tire and wheel” when
install tire and wheel. Align wheel
and tire with original marks.

3.Lower vehicle

3.Service guide

1)Brake gasket check

Check brake lining once driving

every 10，000—15,000km.

Check brake lining once replacing

wheel or tire.

Check two ends of caliper and two

ends of out lining. Worst wear is
usually in this position.

Check the thickness of lining to

insure the lining is not worn early.
Some linings have a
heat-insulating layer. Don’t
mistake the layer as lining. Inner
lining can be checked through check
hole on top of caliper.

Chery QQ Service Manual Chassis System

Replace lining when its thickness

is below 7mm. If the lining is fixed
by rivet, when lining wear position
is 0.5mm from rivet, replace lining
and all linings in the disc.

Install a big C caliper on top of

shell to peak rear of outside
lining.

Slowly screw C caliper until the

piston enters cylinder deep enough
to pull out caliper from the disc.

5. Remove bolts on lower end of
caliper.
HINT: Turn caliper carefully to avoid
damage bolt hood.
7. Turn caliper upwards to repair
lining.
8. Remove lining from caliper support.
9. Remove two clamps from support.
10、Check if following parts is cut,
crack or wear. Replace any damaged
parts:

The support bolt hood.
Piston protector

11、Check if bolts are damaged. Replace
new one if damaging.

3)Polish gasket and brake disc

Polish the disc surface after

replacing lining.

Polish new disc surface after

replacing disc.

Polish new lining 2 times at

48km/h.

Apply middle pressure on brake

pedal.

Keep enough cooling between two

braking.

1. Brake caliper

2. Locating bolt

3. Brake disc

Chery QQ Service Manual Chassis System

4)Brake caliper replace
Disassembly procedure
1、Drain out 1/3 fluid in master
cylinder.
2、Support and lift vehicle.
3、Mark the position of wheel to the
wheel hub.
4、Remove front tire and wheel assembly.
See “Remove and install tire and
wheel”.
5、Install a big C caliper on top of
shell to peak rear of outside lining.
6、Slowly screw C caliper until the
piston enters cylinder deep enough to
pull out caliper from the disc.
HINT: Don’t use flexible hose to
suspend caliper, otherwise it will

damage hose.
7. If remove caliper from vehicle to
repair or replace, it will need to
remove hose bolts and open hose. If
only replacing brake lining, it needs
not to open hose.
8. Block caliper shell and pipe outlet
to prevent fluid to flow out.
9.Removal caliper bolt
10. Remove caliper shell.
11. Check if bolt covers are cut, crack
or wear. Replace any damaged cover.
12. Check if piston covers are cut,
crack or wear. Replace any damaged
cover.
13. Check if bolts are damaged. Replace
new one if damaging.

Piston protector

1. screw

2. soft

pipe

3. washer

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