Chery A15. Instruction - page 81

INSPECTION OF VACUUM BOOSTER

Inspection of brake performance

The driver will feel the brake pedal difficult to step down and its resistance force
considerably increase compared with normal condition when he step it after the vacuum
booster fails. In this case, the booster assy. shall be replaced in time. The condition of
vacuum booster is also determined in accordance with the following convenient method:

-- Shut down the engine, and forcefully step on the brake pedal several times to remove the

vacuum kept inside the vacuum booster.

-- Step on the brake pedal with the appropriate force to make the pedal kept in proper

position.

-- Start up the engine. If you feel the brake pedal fall down automatically and considerably

(force increase), it shows that the function of vacuum booster is normal; if the pedal is no
reaction, and nor force increase, it exhibits that the booster has failed, and the booster shall
be replaced.

-- Replace the booster assy., and, at the same time, replace the gasket. The tightening torque

of the booster assy. and master brake cylinder retaining nut is 20±2 N* m.

Inspection of the check valve of booster vacuum hose

The check valve of vacuum booster is installed in the vacuum hose. If the check valve
failure, the driver will feel the brake pedal difficult to step down, with the feeling of failure
to step it down to its limit, and the subsequent braking performance decreases evidently.

Blow the compression air in accordance with the direction of arrow on the check valve body
when inspecting the check valve, and the air is available to pass through; and don’t pass
through if blowing the air in the reverse direction. Its one-way through is also inspected
using the mouth suction method. Replace the vacuum hose assy. if the check valve is badly
sealed.

PARKING BRAKE SYSTEM

The parking brake is realized by adding a set of manual operating mechanism on the

rear wheel brake, as shown in the figure below. Due to the common use of a set of brake with
the rear wheel brake, it simplifies the structure and reduces the weight.

P-17

Disassembly/Assembly and Installation of Parking Brake System

(as shown in the figure above)

Fit the parking brake dust cover assy. tightly on the parking brake control mechanism, and
use the nuts to secure the parking brake control mechanism assy. onto the welding pegs on
the vehicle body.
* Remove the tire and rear wheel brake drum, and detach the brake cable clip and parking

brake cable suspension clamp, which the tightening clips on the rear axle are available for
the bottom of body

* Remove the auxiliary instrument panel (see the Disassembly/Assembly of Auxiliary

Instrument Panel)

* Remove the parking brake cable and compensation rod connection adjusting nut and lock

nut; And the tightening torque of lock nut is 9±3 Nm.

* Install the hand brake cable and control rod in the reverse order of removal.

1. Brake control rod

5. Compensation rod

2. Tie rod

6. Nut (20Nm)

3. Adjusting nut

7. Parking brake cable

4. Lock nut (8Nm)

8. Parking brake dust cover assy.

Adjustment of Parking Brake

(as shown in the figure below)

2

P-18

The rear brake is an automatic adjusting intermittent
drum brake, so it is necessary to adjust the parking
brake under the normal use, and it is required to
adjust the brake only when replacing the parking
brake cable, brake shoe assy. or brake wheel
cylinder. Adjust it in accordance with the following
procedures:

-- Loosen the handle of parking brake.

-- Forcefully step on the brake pedal once.

-- Pull the handle of parking brake upwards 4

ratchets.

-- Tighten the adjusting nut until the two wheels isn't

available to be turned by hand, as shown in the
figure.

-- Unclip the parking brake, and check whether the

two rear wheels operate freely.

ABS (ANTI-LOCK BRAKE SYSTEM) CONTROL SYSTEM

INTRODUCTION TO ABS CONTROL SYSTEM

Chery’s A15LHD series vehicle adopts the MK
series ABS system manufactured based on the
imported technology. The system is the current
newest generation of anti-lock brake system all
over the world, which has the EBD (Electronic
Brake Distribution) function, and it is unnecessary
to prepare for the brake proportion control valve.
This system has the following characteristics:

* Integrated module structure design

* Small dimension, light weight and low cost

* Security and reliable, easy to maintenance

* With the failure information storage and

self-diagnostics interfaces

DISASSEMBLY/ASSEMBLY AND INSTALLATION OF ABS CONTROLLER

Adjusting Nut

Adjusting Nut

P-19

Notices:

* Use the diagnostic tester to find out the
seasons of failures, and then repair it;

* Unpack the spare part packaging just
before the beginning of installation;

* Only the original parts are available;

* Pay more attention to the cleanliness during
repair, and wipe it only with the non-woolen
cloth;

* Use the cleaning agent without the mineral
oil to wipe the outside surface clean before
repair;

* Do not use the compressed air or move the
vehicle when the system activates;

* Remove the ABS assy., and use the proper
plugs to block all outlets of hydraulic equipment
quickly as possible;

* Remove other parts which may disturb the
repair operation;

* Please use the brake fluid DOT 4, and do
not apply any mineral oil;

* Use the brake fluid to soak the seals and
O-ring, and it is prohibited to use the engine oil
or ointment;

* Check the availability of the regular brake
system and ABS brake function after the
completion of repair;

l Check the leakage of all joints of hydraulic

pipes.

Removal of MK20-I HECU assy.

* Turn off the ignition switch and disconnect the
negative wire of battery;

* Remove the electrical harness from the ABS
assy.;

* Step the pedal downwards >60 mm, and use the
pedal support to fasten it; It will shut down the

P-20

Рассказать друзьям