C4 hydraulic clutch pedal action

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1995dj
Posts: 16
Joined: 05 Sep 2019, 11:04

C4 hydraulic clutch pedal action

Post by 1995dj »

Hi
Long story but we have been subject of a scam and left with a c4 piscasso hdi 2014.
After confirming we were the legal owners of the car I placed it for sale. The first person who viewed it said it had a clutch issue. Oh !!
The peddle did not return fully to the top without tucking your foot under it and pulling it up. I changed the master cylinder, not a nice job if you dont have 6ft long arms. Bled it through and the peddle now returns but there is 1/4 of the travel with no pressure. It no change Ok guessed wrong changed the slave cylinder - no difference.
Took 2 days off work and changed the clutch this week guess what no real difference. Ah!!!
To bleed the clutch I push the clip in and pull the feed pipe back a small amount and hold it in place whilst some presses the peddle or I vacuum or pressure bleed the system. Yes tried all sorts. Is the secret something to do with the feed pipe positioning whist bleeding.
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GiveMeABreak
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Re: C4 hydraulic clutch pedal action

Post by GiveMeABreak »

It depends on which system you have and which vehicle as there are 2 different bleeding methods depending on which.

Pop up your VIN so we know which gearbox you have.
1995dj
Posts: 16
Joined: 05 Sep 2019, 11:04

Re: C4 hydraulic clutch pedal action

Post by 1995dj »

I have the external slave cylinder on the 5 speed manual gearbox.
VF7**************[VIN obfuscated, can be read by forum staff]
Could it be a week clutch return spring
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GiveMeABreak
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Re: C4 hyhttps://frenchcarforum.co.uk/forum/posting.php?mode=reply&t=69955#draulic clutch pedal action

Post by GiveMeABreak »

Ok, here you go, these are the correct bleeding procedures. I've listed all the variants, just read through them all to make sure you have everything covered.

There is more than one bleed system:
  • Double-clip bleed system
  • Screw bleed system
Put the vehicle on a hoist.
Remove components as necessary for bleeding the hydraulic clutch control.

N.B.: Use exclusively the hydraulic fluid(s) approved by the manufacturer.

ESSENTIAL: During the bleed operations, take care to maintain the level of brake fluid in the reservoir by topping it up (If necessary).

Before any operations:
  • Mark the level of brake fluid in the reservoir
  • Remove the brake fluid reservoir cap
  • Fill the brake fluid reservoir to its maximum capacity
Bleeding: Hydraulic clutch control (Double-clip bleed system)

CAUTION: When coupling and uncoupling, maintain the hydraulic pipe in its axis and do not lever it, so as to prevent any rupture.
C4 Pic Clutch A.PNG
Remove the protection cap from the bleed orifice (4).
Store the protection cap in a clean place.
Connect a transparent tube onto the bleed orifice (4).

CAUTION: The end of the transparent pipe must be submerged into the brake fluid.

Clamp the clip (2).

CAUTION: The clip (2) must always remain clipped in position on the hydraulic clutch slave cylinder during the bleed.

Unclip the clip (3).
Pull on the hydraulic pipe (1) to free the bleed orifice (4) (In the direction of the arrow "a").
Allow the brake fluid to flow out by gravity until there are no air bubbles.
Clamp the clip (3).
Push in the hydraulic pipe (1) to close the bleed orifice (4) (In the opposite direction to the arrow ).
Fill the brake fluid reservoir to its maximum capacity.

N.B.: Two people are required to perform the following operation.

Unclip the clip (3).
Pull on the hydraulic pipe (1) to free the bleed orifice (4)(In the direction of the arrow "a").
Press the clutch pedal slowly down to the floor.
Clamp the clip (3).
Push in the hydraulic pipe (1) to close the bleed orifice (4) (In the opposite direction to the arrow "a").
Unclip the clip (2).

N.B.: Manually refit the clutch pedal in its high position.

Repeat the operation until the fluid running out is clean and free from air bubbles (20 times minimum).
Top up the brake fluid to the level marked previously.
Refit the brake fluid reservoir cap.
Uncouple the transparent pipe.
Refit the protection cap on the bleed aperture (4).
Check the travel of the hydraulic clutch control slave cylinder (see corresponding chapter).

CAUTION: Check that the bleed opening (4) is correctly closed by operating the clutch pedal several times Check there are no leaks or seeping (risk of vehicle fire in the event of a leak).

Bleeding: Hydraulic clutch control (Screw bleed system)

Quarter turn system

C4 Pic Clutch B.PNG
Remove the bleed screw (5) protection cap.
Store the protection cap in a clean place.
Couple a transparent tube on the bleed screw (5).

CAUTION: The end of the transparent pipe must be submerged into the brake fluid.
N.B. :Two people are required to perform the following operation.


Retain the clutch pedal in the lowest position (end of travel).

Open the bleed screw (5):
  • A half-turn anti-clockwise for a hydraulic clutch control slave cylinder
  • A half-turn anti-clockwise for a bleed union
Allow the brake fluid to flow out by gravity.

Close the bleed screw (5):
  • A half-turn clockwise for a hydraulic clutch control slave cylinder
  • A half-turn clockwise for a bleed union
N.B.: Manually refit the clutch pedal in its high position.

Repeat the operation until the fluid running out is clean and free from air bubbles (20 times minimum).
Top up the brake fluid to the level marked previously.
Refit the brake fluid reservoir cap.
Disconnect the transparent pipe from the bleed screw (5).
Refit the protection cap on the bleed screw (5).
Check the travel of the hydraulic clutch control slave cylinder (See paragraph 4).

CAUTION: Check there are no leaks or seeping (risk of vehicle fire in the event of a leak).

6-sided screw system
C4 Pic Clutch C.PNG
Remove the bleed screw (6) protection cap.
Store the protection cap in a clean place.
Couple a transparent tube on the bleed screw (6).

CAUTION: The end of the transparent pipe must be submerged into the brake fluid.
N.B.: Two people are required to perform the following operation.


Retain the clutch pedal in the lowest position (end of travel).
Turn the bleed screw (6) (Anti-clockwise).
Allow the brake fluid to flow out by gravity.
Close the bleed screw (6) (Clockwise).

N.B.: Manually refit the clutch pedal in its high position.

Repeat the operation until the fluid running out is clean and free from air bubbles (20 times minimum).
Top up the brake fluid to the level marked previously.
Refit the brake fluid reservoir cap .
Uncouple the transparent pipe.
Refit the protection cap on the bleed screw (6).
Check the travel of the hydraulic clutch control slave cylinder (See paragraph 4).

CAUTION: Check there are no leaks or seeping (risk of vehicle fire in the event of a leak).

Checking: Travel of the hydraulic clutch control slave cylinder
C4 Pic Clutch D.PNG
Measure the travel "A", from the clutched position "b" to the declutched position "c".
The travel "A" should be between 18 and 22 mm.
If the value is incorrect : Repeat the bleed operations.
1995dj
Posts: 16
Joined: 05 Sep 2019, 11:04

Re: C4 hydraulic clutch pedal action

Post by 1995dj »

The unit I have is not the two detailed above.
There is only one clip and the bleed is on the side
Part number 9808066680
1995dj
Posts: 16
Joined: 05 Sep 2019, 11:04

Re: C4 hydraulic clutch pedal action

Post by 1995dj »

16368094940768028755770232379100.jpg
1995dj
Posts: 16
Joined: 05 Sep 2019, 11:04

Re: C4 hydraulic clutch pedal action

Post by 1995dj »

Update- found movement on the peddle to mater cylinder the clip was not full home. Removed the peddle and checked everything looked ok.
Re- assembled and now the peddle sticks at the top - so back to square one but £650 lighter
Anyone have any ideas ??
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GiveMeABreak
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Re: C4 hydraulic clutch pedal action

Post by GiveMeABreak »

That's the official procedure for your VIN - so should cover it. Other than that I'm not sure....
1995dj
Posts: 16
Joined: 05 Sep 2019, 11:04

Re: C4 hydraulic clutch pedal action

Post by 1995dj »

Need to replace the peddle clip p308? As it has play and allows the pedal to move 40 - 50mm before pushing on the master cylinder rod.