Dacia SuperNova (engine E7J). Service manual — part 79
MECHANICAL ELEMENTS CONTROL
37
HAND BRAKE SECONDARY CABLE
RE MOUNTING
Grease the cable with UM 185 Li 2.
Perform the dismounting operations in the reverse order.
Adjust the hand brake control lever stroke.
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MECHANICAL ELEMENTS CONTROL
37
BRAKE FLEXIBLE HOSES
The SUPER NOVA vehicles are equipped with flexible hoses with copper gaskets in order
to ensure the sealing.
PRECAUTIONS IMPOSED TO BE RESPECTED WHEN
DISMOUNTING – REMOUNTING A RECEIVER
OR A BRAKE FLEXIBLE HOSE
Due to security reasons, in order to avoid brake flexible hose twisting and the risk to get in
contact with the suspension elements, it is necessary to observe the following operations sequence.
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TIGHTENING MOMENTS (daNm)
X (caliper flexible)
2,0
Y (the attachment connection screw of the rigid pipe on the flexible) 1,5
MECHANICAL ELEMENTS CONTROL
37
BRAKE FLEXIBLE HOSES
DISMOUNTING
Unscrew the connection (1) (wrench) of the rigid pipe on the flexible hose till the moment
when the spring (3) is relaxed, having releasing the splinted area (4) of the sustaining bed.
Unscrew the flexible from the caliper and eventually dismount the caliper.
REMOUNTING
Assemble the caliper with the caliper fork, mount the wedges and then screw the flexible in
the caliper, then tighten at the moment of 2 daNm.
The flexible must be mounted when the half axle is in the position:
- symmetric wheels (mounted suspension)
- train in line (straight wheels)
Position the female end of the flexible on the sustaining bed (5) without twisting forcing and
check if the splinted area ( 4 ) is freely coupling in the bed splints, then place back the spring (3)
and screwing the rigid pipe on the flexible avoiding twisting.
Tighten the connection screw at a moment of 1,5 daNm.
Purge the brake circuit.
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MECHANICAL ELEMENTS CONTROL
37
BRAKE PRESSURE CONTROLLER
Brake pressure controller, load sensitive, avoiding the rear wheels blocking.
OPERATION PRINCIPLE
The brake pressure controller enables the rear circuit pressure “ modulation “ according to
two parameters:
- the pressure value in the front circuit
- the load on the rear axle
The pressure controller is operating on the principle of pressure compensation in two enclosures,
separated by means of a ball and spring valve.
The back pressure at the valve level is created by means of the force developed by the
continuos action compensating spring and of the control spring acting in proportion as the rear
axle load is increasing.
The pushing rod is transmitting the force of the lever spring to the pressure controller piston,
which is controlling the valve ball being in the open normal position (position P 1).
BRAKING MOMENT
In the same time with pressure increase when entering in the pressure controller, this will act
upon the ball, forcing it to overcome the continuos acting spring force and by uncovering the
valve hole, to facilitate the releasing of this pressure. In the braking moment, due to position
changing of the vehicle body compared to the rear axle, by means of the acting levers, the limiting
piston is moving toward the interior, reducing the fluid exist diameter, leading to the obtaining in
this way of the pressure reduction in the rear circuit.
DE BRAKING MOMENT
In the moment of fluid inlet pressure restoring ( by leg lifting from the brake pedal ), the piston
will come back in the initial position, gradually and quickly allowing the same diameter existent at
the beginning of the braking for which the valve is open ( position P1 ).
1.
Pressure controller body
2.
Valve
3.
Plug
4.
Spring
5.
Ball
6.
Piston
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