Chery A15 / 480 LHD model. Manual - part 67

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.

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)

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

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
central valve of main bump and thus the brake fluid

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