Renault Laguna III, Manual

Page: 2381 / 3699

37A
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47
MECHANICAL COMPONENT CONTROLS
Clutch circuit: Bleed
PK4 or TL4
37A
Bleed in the event of:
- dead travel,
- pedal at mid-travel,
- pedal to the floor,
- poor gear changing.
I - PRECAUTIONS DURING REPAIR
Risks relating to contamination.
a
The hydraulic clutch system is very sensitive to con-
tamination. The risks caused by contamination are:
- impossible to change gears,
- damage to or destruction of the clutch system,
- leaks on the hydraulic circuit.
All the operations on the hydraulic clutch circuit sys-
tem must be carried out under excellent cleanliness
conditions. This ensures that no impurities enter the
hydraulic circuit during the operation.
The cleanliness principles apply to all components
of the hydraulic clutch circuit.
Items causing contamination are:
- metal or plastic swarf,
- fibres:
• cardboard,
• brushes,
• paper,
• clothing,
• cloth,
• dust and particles in the air,
• etc.
Cleaning cloths.
a
Use lint-free cleaning cloths (see Products recom-
mended for the repair ) (04B, Consumables - Prod-
ucts).
Each cloth must only be used once.
There are two types of equipment used to bleed the
clutch circuit:
a
ARC50 via the brake fluid reservoir.
a
Syringe via the bleed hole located on the clutch
slave cylinder.
There are two procedures used to bleed the clutch
circuit:
a
If no parts of the hydraulic clutch circuit are remo-
ved:
- Carry out the bleed operation using the ARC50 via
the brake fluid reservoir or using a new syringe via
the bleed hole located on the clutch slave cylinder.
a
If no parts of the hydraulic clutch circuit are remo-
ved:
- Only carry out the bleed operation using a new sy-
ringe by injecting the brake fluid via the bleed hole
on the clutch slave cylinder.
Consumables required for the repair:
a
Bleed the clutch circuit using approved (see Vehi-
cle: Parts and consumables for the repair ) brake
fluid (04B, consumables - products).
II - PREPARATION OPERATION
a
Position the vehicle on a two-post lift (see Vehicle:
Towing and lifting ) (02A, Lifting equipment).
a
Remove the engine undertray.
Equipment required
brake circuit bleeding device
hydraulic circuit bleed syringe
Note:
- Even the tiniest air bubble in the circuit can
cause faulty operation (pedal failing to return
properly, crunching sound when changing gear,
etc.).
- Incorrect bleeding can lead to incorrect detec-
tion of faults and unnecessary part replace-
ments.