2004 DACIA SUPERNOVA brake

20
CLUTCH
It is a dry mono-disc clutch with hydraulic
command. The clutch mec hanism has a diaphragm
spring.
The clut ch d isc has an elastic hub.
Th e su pply of the hydraulic circuit is done
with liquid from the brake-liquid tank. The principle of this command is the same
as that of a brake command.
The cl utch pedal operates on the emitting
cy linder, which transmits the liquid under pres-
sure to a concentric hydraulic receiver, the mo-
bile part of which acts directly on the diaphragm
spring.
The hydrau lic receiver is fixed on the clutch crankcase through the agency of two screws.
20 - 1
IDENTIFICATION
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DRIVE SHAFTS
29
FRONT TRANSVERSAL TRANSMISSION
DISMOUNTING - THE SIDE TO WHEEL
Loosen the left wheel screws.
Lift the vehicle on an elevator with two columns.
Di smount the wheels.
Di smount the scre ws that attach the brake disk assembly on the steering knuckle.
Un screw the transmission nut by means of the RO 604 – 01 device.
Di smount :
- the nut of t he steering ball joint;
- steering ball joint from the steering knuckle, by means of the PF 476 extractor; the
attachment screws of the steering knuckle on the shock absorber end. S
PECIAL TOOLS
- RO 604-01 Hub immobilizing device
- PF 476 Ball joint extractor
TIGHTENING MOMENTS (daN/m)
- Transmission nut 21\
- Screw for fixing the bellows lid on the gearbox 2,5
- Wheels attachment screw 7,5
- Screws, nuts for fixing the steerin g knuc kle on the shock absorber 7,5
- Screw for fixing the caliper on the steeri ng knuckle 6,5
- Nut for steering ball joint 4
Pu sh the transmission in the steering knuckle and incline the latter.
Di smount the transmission, the wheel side.
29 - 1
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DRIVE SHAFTS
29
FRONT TRANSVERSAL TRANSMISSION
REMOUNTING – THE SIDE TO THE GEARBOX
The left side
Engage the t ransmission GI joint in the ge arbox (the transmission position as horizontally
as possible).
Mount the thre e attachment screws of the bellows lid on the gearbox.
The right side
Grease the t ulip fra me grooves (the grooves area) and t he tra nsmission shaft of t he
gearbox with transmission oil.
Engage the transmission GI joint (the tulip) on the transmission shaft of the gearbox
(the tra nsmission position must be as horizontally as possible).
REMOUNTING – THE SIDE TO THE WHEEL
For both sides
Engage the transmission in the steering knuckle, this one being necessary to freely enter,
so that threaded area of the steering knuckle is allowing to remounting the transmission nut.
Pe rform then the dismounting opera tions in the reverse orde r.
Ob serve the tightening moments.
Remount the brake disk assembly.
Refill the gearbox with oil.
Pr ess several times the brake pedal to enable caliper piston coming in contact with the
brake pads.
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30
GENERAL
30 - 1
SCHEDULE OF HYDRAULIC BRAKE SYSTEM IN PARALLEL
WITH BY–PASS CIRCUIT
BRAKE IN PARALLEL WITH BRAKE LIMITER
GENERAL PRINCIPLE SCHEDULE OF THE BRAKE
CIRCUIT
NO TE :
The following schedule is a ge neral principle schedule and it cannot be considered as
ref erence for the brake circuit failures and damages When replacing one of the vehicle
brake circuit element, the ducts must be identified before dismount them, in order to be
able to reconnect them obligatory in their initial positions.
* front brake circuit:
* rear brake circuit
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30
GENERAL
30 - 6
COMPOSITION AND DIMENSIONS OF THE MAIN BRAKING
SYSTEM ELEMENTS
Front brake
Brake caliper bore diameter F 54 mm
Aer ated bra ke disk diameter F 235 mm
The axial run out of the disk measured at Æ215 0,1 mm
Brake disk m aximum thickness 20 mm
Brake disk minimum thickness 19 mm
Braking pad thickness (support included) 14 mm
Minimal brake pad thickness (support included) 7 mm
R ear brake
Wheel braking cylinder bore diameter F 22 mm
Ne w drum diameter F 228 mm
Dr um diameter aft er grinding F 229 mm
Shoe braking lining width 40 mm
Braking lining thickness 5 mm
Minimal accepted braking lining height above rivets 0,5 mm
Master brake pump cylinder
Bore diameter 20,6 mm
Pump maximum stroke 32 mm
Brake fluid reservoir Without level alert sensor
Pressure limite r For parallel circuit
Ser vobrake master vac 7” 177,8 mm
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30
GENERAL
30 - 7
Rigid pedal: when braking,
an increased e ffort for a small
deceleration is perform ed
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 depre ssion
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 e ngine
pedal is rig id
fro m t i me to
time ?
1
Is the connection
sh af t between
the serv ob ra k e
fork and the pedal,
grabed?
At the servobrake
entrance i s the
depre ssion the
imposed one ? I. FAILURE : RIGID PEDAL
BRAKING SYSTEM DIAGNOSTIC
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30
GENERAL
30 - 8
1
I. FAILURE : RIGID PEDAL (ctd)
On e o f th e
rigid brake
pipes is it
smashed ?
Dismount the bra ke caliper or
the brake cylinder?
Replace the corresponding
rigid pipe.
Are the brake
caliper’s pistons
or the cylinders ones correctly gliding ?
STOP
Replace the defective parts
(with Genuine Spare Parts)
Replace the brake pads,
consequently the bra ke shoes (see bellow situations).Are the brake pads,
consequently the shoes
gasket in good
condition?
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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30
GENERAL
30 - 9
II.
FAILURE : LONG PEDAL
When braking, the bra ke pedal is slowly moving.
Pe rfo rm a t e st with t he st oppe d e ngi ne , a f t e r
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 brake fluid
level lower
compared to the required one?
Replace the brake pump, because the pressure gas-
ket (sealing) between the primary circuit and t he
secondary circuit is defective.
STOP
BRAKING SYSTEM DIAGNOSTIC
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