2004 DACIA SOLENZA Repair Manual

GENERAL
30 - 4
30Tightening moments (daNm)
REAR AXLE
Rear
axle
8.5
3.5
7.5
12
22
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GENERAL
30 - 5
30Tightening moments (daNm)
REAR AXLE
Rear
axle
7.5
2
12 1.45
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GENERAL
30 - 6
30Composition and dimensions of the main
braking system elements
Front brakes
- brake caliper bore diameter → 54 mm
- brake disk diameter → 235 mm
- disk axial runout measured at → 215 0. 04 mm
- brake disk maximal thickness 20 mm
- brake disk minimal thickness 19 mm
- braking pad thickness (support included) 14 mm
- brake pad minimal thickness (support included) 7 mm
Rear brakes
- wheel braking cylinder bore diameter → 22 mm
- new drum diameter → 228 mm
- drum diameter after grinding → 229 mm
- braking shoes lining width 40 mm
- braking shoes lining thickness 5 mm
- minimal accepted braking lining height above rivets 0.5 mm
Master cylinder
- diameter of bore 20.6 mm
Brake fluid reservoir without alarm sensor
Pressure limiter for circuit in parallel
S ervobrake master vac 7" 177.8 mm
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GENERAL
30 - 7
30Braking system diagnostic
Rigid pedal: when braking, an
increased effort for a small decel-
eration is performed
Ye s Replace: shaft, pedal or
servobrake fork.
Ye s
Ye s
Ye s No
No
No
No
Replace the servobrake
(broken membrane)
Replace the servobrake
(broken membrane)
Check:
- the integrity of the depression
pipe, consequently of the retain-
ing valve;
- the sealing of the depression pipe
at the servobrake, consequently at
the vacuum pump (inlet manifold).

Is the engine
regime changing
when braking ?
The engine pedal
is rigid from time
to time ?
1
Is the connection
shaft between the
ser vobra ke fork
and the pedal,
grabed?
At the servobrake
entrance i s the
depre ssion the
imposed one ? I. FAILUR
E : RIGID PEDAL
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GENERAL
30 - 8
30
1

I. FAILURE : RIGID PEDAL (ctd)
One of the rigid
brake pipes is it
smashed ?
Dismount the brake caliper or
the brake cylinder?
Replace the corresponding rigid
pipe.
Ar e the br a ke
caliper’s pistons or
the cylinders ones
correctly gliding ?
STOP
Replace the defective parts
(with Genuine Spare Parts)
Replace t he brake pads, conse-
quently the brake shoes (see
bellow situations).Are the brake pads,
consequently the shoes
gas ket in good condit ion?
The brake linings are to be replaced when
they are: -greasy -shiny
-not in accordance with the
manufacturer ’s prescriptions (genuine Spare
Pa rts have not been used).
Ye s Ye s
No
No
No
Braking system diagnostic
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GENERAL
30 - 9
30
II. FAIL URE : LONG PEDAL
When braking, the brake pedal is slowly moving.
Perform a test with the stopped engine, after previously
performing five successive pushing on the brake pedal
(in order to vacuum the servobrake).
Locate and repair or replace the
item where a brake fluid leak is
established.
Ye s
No
Is the br ak e f luid level
lower compared to
the r e quired o ne?
Replace the brake pump, because the pressure gas-
ket (sealing) between the primary circuit and the sec-
ondary circuit is defective.
STOP
Braking system diagnostic
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GENERAL
30 - 10
30Braking system diagnostic
I. CO NSTANT EFFECT TO THE PEDAL
EFFECTS
T ough pedal:
High effort for small deceleration.
Elastic pedal
In order to di agnose, an i ncident where
the use was normal is to be analyzed and two
tests are to be pe rformed:
1. While driving the vehicle :
Interpretation test: pedal stroke/ deceleration
rate.
2. While vehicle i s stopped, engine c ut.
A dditional test of brake pedal press:
Pe rform five c onsecutive pressings on the
brake pedal in order to vacuum the
servobrake, before taking into consideration
the test result.
Long pedal
The test i s to be performed with stopped
vehicle and cut engine.
REMARK:
It is neces sary to perform five
consecutive pressings on the brake pedal,
in order to vacuum the servobrake before
taking into consideration the test result.
Floor pedal
The test i s to be performed with stopped
vehicle and cut engine.
REMARK :
Perform five consecutive pressings on
the brake pedal, i n order to vacuum the
s ervobrake before takin g into
consideration the test result. POSSIBLE CAUSES
- Assi stance defect
- Brake linings:
- greasy
- stacking to t he disk ( non-c onform )
- heating, prolonged bra king with c onstant
pedal press
- Stuck piston
- R igid duct narrowed (flattening)
- Air presence in the circuit: defective purging
- Internal leak in the braking circuit.
- Leak of fluid from reservoir (external fluid
leak from braking circuit).
Automatic adjustment : ha nd brake c able too
tighten. - Important and asymmetric wear of the
b rake linings
- St roke too ample between the servobrake
pushing rod and the brake pump
- Brake fluid having high temperature.
- Hydraulic l eak (check the sealing of the
b raking system components)
- Sealing gaskets defects of the two brake
pump circuits.
- Brake fluid having high temperature
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GENERAL
30 - 11
30Braking system diagnostic
II. CONSTANT EFFECT AT BEHAVIOUR
EFFECTS
Brakes not accomplishing the required
b raking distance
Vibrating brakes
When braking, the vehicle ( front part)
is left/right deviating
Braking
Heating brakes POSSIBLE CAUSES
- Non-uniform worn brake linings (backing
off);
- Brake l inings slightly gr eased;
- Springs with modified characteristics.
- Brake disks with high wobbling;
- Inconstancy brake disks width;
- Particles abnormal deposit on brake disks
(oxidation between linings and disk).
- Front axle suspension, steering (to be
checked);
- Stuck piston;
- Tires – wear, inflation pressure;
- R igid duct narrowed (flattening).
- Stuck piston;
Automatic adjustment : hand brake cable very
tighten.
REMARK :
Automatic recovering is performed by
means of the brake pedal, if there is no ab-
no rm al t ensi on in the hand brake cable
when released (hand brake released).
- Return spring.
- Insufficient hydraulic stroke of the brake
pump, not allowing the return at rest of the
brake pump pistons ( brake pump remaining
under pressure);
- St uck pistons or hardly returning;
- R igid duct narrowed (flattening);
- Def ective adjustment of the hand brake
control.
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