Renault Koleos Service Repair Manual: Clutch circuit: Bleed

ND5 or ND8

Mechanical component controls

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.

  • The hydraulic clutch system is very sensitive to contamination.

    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 system 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.

  • Use lint-free cleaning cloths (see Products recommended for the repair) (04B, Consumables - Products).

    Each cloth must only be used once.

There are two types of equipment used to bleed the clutch circuit:

  • ARC50 via the brake fluid reservoir.
  • Syringe via the bleed hole located on the clutch slave cylinder.

There are two procedures used to bleed the clutch circuit:

  • If no parts of the hydraulic clutch circuit are removed:
    • 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.
  • If no parts of the hydraulic clutch circuit are removed:
    • Only carry out the bleed operation using a new syringe by injecting the brake fluid via the bleed hole on the clutch slave cylinder.
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 detection of faults and unnecessary part replacements.

Consumables required for the repair:

  • Bleed the clutch circuit using approved (see Vehicle: Parts and consumables for the repair) brake fluid (04B, consumables - products).

II - PREPARATION OPERATION

  • Position the vehicle on a two-post lift (see Vehicle: Towing and lifting) (02A, Lifting equipment).
  • Remove the engine undertray.

There are several versions of bleed screw:

Screw type bleed screw.

Mechanical component controls

  • To open the bleed screw, hold the plastic union (1) using a ring spanner and undo the bleed screw (2) .

Half-turn bleed screw.

Mechanical component controls

  • To open the bleed screw, fully turn the bleed screw (3) by hand.

Bleed screw with a clip.

Mechanical component controls

  • To open the bleed screw, press and hold the clip (4) while pulling by one notch.

Bleed screw with a clip.

Mechanical component controls

  • To open the bleed screw, lift the clip (5) while pulling by one notch.

Bleed screw with two clips.

Mechanical component controls

  • To open the bleed screw, lower the clip (6) and lift the clip (7) while pulling by one notch.

III - BLEED PROCEDURE IF NO PARTS OF THE HYDRAULIC CIRCUIT ARE REMOVED

1 - Bleed using the ARC50.

  • Keep the clutch pedal in the upper position using a strap attached to the steering wheel to ensure continuity of the hydraulic circuit during the bleed operation.
Note: Take care not to disrupt the adjustment of the clutch start of travel switch.
  • Connect the brake circuit bleeding device (after having received Renault approval) to the master cylinder reservoir (see the instructions for the equipment).
  • Remove the bleed plug from the clutch slave cylinder.
  • Connect a transparent pipe to the bleed hole running to an empty container placed under the bleed hole.
  • Open the bleed screw.
  • Open the circuit between the bleeding device and the brake fluid reservoir.
  • Let the brake fluid run until all air bubbles have been released.
  • Stop the bleeding device to dump the pressure in the clutch circuit.
  • Close the bleed screw.
  • Remove the transparent pipe from the bleed hole.
  • Refit the bleed plug.
  • Top up the brake fluid level in the master cylinder reservoir after disconnecting the bleed device.
  • Disengage and engage the clutch quickly around twenty times.
  • Check that the clutch system is operating correctly.
  • Repeat the bleed operation if necessary.
  • Check the adjustment of the switch. (see 37A, Mechanical component controls, Clutch pedal switch: Removal - Refitting, page 37A-61) (37A, mechanical control elements).

2 - Bleed using a new syringe.

  • Keep the clutch pedal in the upper position using a strap attached to the steering wheel to ensure continuity of the hydraulic circuit during the bleed operation.
Note: Take care not to disrupt the adjustment of the clutch start of travel switch.
  • Remove the bleed plug from the clutch slave cylinder.
  • Connect a transparent pipe of sufficient length to the bleed hole (at least thirty centimetres) in order to place it at the same height as the reservoir.
  • Open the bleed screw.
  • Fill the brake fluid master cylinder reservoir until brake fluid flows out of the bleed screw.
Note: The transparent pipe must remain at the same height as the master cylinder reservoir to prevent air from entering inside the clutch circuit.
  • Connect a new hydraulic circuit bleed syringe filled with a useful volume of 60 ml of approved brake fluid to the end of the transparent pipe.
  • Slowly inject the entire contents of the syringe into the hydraulic clutch circuit without injecting any of the air from the top section of the syringe.
  • Close the bleed screw.
  • Remove the transparent pipe from the bleed hole.
  • Refit the bleed plug.
  • Top up the brake fluid level in the master cylinder reservoir.
  • Disengage and engage the clutch quickly around twenty times.
  • Check that the clutch system is operating correctly.
  • Repeat the bleed operation if necessary.
  • Check the adjustment of the switch. (see 37A, Mechanical component controls, Clutch pedal switch: Removal - Refitting, page 37A-61) (37A, mechanical control elements).

IV - BLEED PROCEDURE IF PARTS OF THE HYDRAULIC CIRCUIT ARE REMOVED.

WARNING The master cylinder pipe must be disconnected from its take-off point on the brake fluid reservoir, to avoid any foreign matter penetrating inside the hydraulic brake circuit.

 

WARNING Prepare for the flow of fluid and protect the surrounding components.

 

Note: Prefill the hydraulic circuit pipe equipped with a filter.

Position the filter head facing downwards to ensure that it fills.

There are several versions of pipe with and without a filter:

Pipe without filter.

Mechanical component controls

Filling position for pipe with filter.

Mechanical component controls

Filling position for pipe with filter.

Mechanical component controls

Filling position for pipe with filter.

Mechanical component controls

  • Prefill the clutch pipe using the syringe.
  • Plug the prefilled pipe on the master cylinder end to stop any brake fluid from escaping.

Mechanical component controls

  • Prefill the hydraulic tappet using the new syringe (by gravity).
  • Refit the part(s) concerned.

V - BLEED PROCEDURE AFTER A REMOVING A COMPONENT OF THE HYDRAULIC CIRCUIT.

  • Keep the clutch pedal in the upper position using a strap attached to the steering wheel to ensure continuity of the hydraulic circuit during the bleed operation.
Note: Take care not to disrupt the adjustment of the clutch start of travel switch.
  • Remove the bleed plug from the clutch slave cylinder.
  • Connect a transparent pipe of sufficient length to the bleed hole (at least thirty centimetres) in order to place it at the same height as the reservoir.
  • Open the bleed screw.
  • Fill the brake fluid master cylinder reservoir until brake fluid flows out of the bleed screw.
Note: The transparent pipe must remain at the same height as the master cylinder reservoir to prevent air from entering inside the clutch circuit.
  • Connect a new syringe containing 60 ml of approved brake fluid to the end of the transparent pipe.
  • Slowly inject the entire contents of the syringe into the hydraulic clutch circuit without injecting any of the air from the top section of the syringe.
  • Close the bleed screw.
  • Remove the transparent pipe from the bleed hole.
  • Refit the bleed plug.
  • Top up the brake fluid level in the master cylinder reservoir.
  • Disengage and engage the clutch quickly around twenty times.
  • Check that the clutch system is operating correctly.
  • Repeat the bleed operation if necessary.
  • Check the adjustment of the switch. (see 37A, Mechanical component controls, Clutch pedal switch: Removal - Refitting, page 37A-61) (37A, mechanical control elements).

VI - FINAL OPERATION

  • Refit the engine undertray.
  • Remove the vehicle from the two-post lift (see Vehicle: Towing and lifting) (02A, Lifting equipment).
    Clutch pedal position sensor: Removal - Refitting

    Clutch master cylinder: Removal - Refitting

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