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Citroen C4 – Brake pad replacement

This applies to my Citroen 2012 C4 1.6 HDi with automatic handbrake. So far I have only had to replace the pads on the front brakes. For service info see Citroen C4 Service.


Automatic handbrake

Normally the handbrake is applied automatically when you turn off the engine. To keep the handbrake off when the engine is turned off, follow this procedure:

  • Turn the ignition on.
  • Hold the foot brake pedal down.
  • Apply the handbrake switch
  • The handbrake will release and there will be a bleeping sound.
  • Turn ignition off
  • The handbrake will remain off until you start the engine again.


Front brakes

As far as I am aware there are two makes of brake that might be on this model, Lucas or Bosch. The one described here is Bosch.

  1. The brake caliper (which is floating, which means it is free to move a small amount side to side), is held by two screws with T50 Torx heads.

    brake caliper 1


  2. The lower one has an attachment that should be removed first, there is a plastic cap which should be prized open, then use a Torx30 to unscrew it.

    brake caliper 2


    brake caliper 3


  3. To unscrew the caliper screws, you need to hold the part that it screws into, see picture.

    brake caliper 4


  4. Unscrew the caliper - use good quality Torx T50 bits for this. When you have the caliper unscrewed, prop it up on something so it is not hanging by the brake lines. Remove the old pads and the metal clips.


  5. Remove the brake reservoir cap in the engine bay.


  6. Next you have to push in the pistons. These pistons have to be wound as they are pushed in, so you should get the proper tool for this. You can get cheap ones on eBay or similar, I got an excellent one with attachments for various different brakes for £16. If you attempt pushing in the piston without a special tool I can only wish you the best of luck as you will certainly need it !


  7. When pushing in the piston check every so often that the brake fluid is not overflowing out of the reservoir. The piston on the right-side brake must be wound clockwise. The piston must on the left-side brake must be wound anticlockwise. They should be nearly impossible to turn in the opposite direction.


  8. Next give the caliper a good cleaning and remove any build up of dirt and deposits, especially where the pads are located. You may find that a file is useful for this. You want the new pads to be able to move relatively freely, otherwise your brakes may bind - i.e., the pads keep rubbing against the disc and this causes wear and overheating. Also clean the piston gently with a cloth and solvent.


  9. I found that it was easier to reassemble the caliper assembly by taking the fixed part of the caliper off, this is also held by two Torx T50 screws.


  10. When you have it all reassembled, pump the brakes a few times to push the pistons onto the pads so as to take up any slack. Then spin the wheels and check that the brakes are not sticking - if they are, something is not right and you will have to investigate.


  11. Replace the brake reservoir cap.


  12. Use somewhere safe to check the brakes are working okay before you go out on a journey.



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The Lighter Side



Recently added pages

How you can tell if someone is a crackpot


Platonism’s Logical Blunder


Richard’s Paradox


Alexander’s Horned Sphere


Curry’s Paradox


A review of Buldt’s The Scope of Gödel’s First Incompleteness Theorem


Lebesgue Measure

There is now a new page on a contradiction in Lebesgue measure theory.



Illogical Assumptions

There is now a new page Halbach and Zhang’s Yablo without Gödel which analyzes the illogical assumptions used by Halbach and Zhang.



Easy Footnotes

I found that making, adding or deleting footnotes in the traditional manner proved to be a major pain. So I developed a different system for footnotes which makes inserting or changing footnotes a doddle. You can check it out at Easy Footnotes for Web Pages (Accessibility friendly).



O’Connor’s “computer checked” proof

I have now added a new section to my paper on Russell O’Connor’s claim of a computer verified incompleteness proof. This shows that the flaw in the proof arises from a reliance on definitions that include unacceptable assumptions - assumptions that are not actually checked by the computer code. See also the new page Representability.


Previous Blog Posts  




For convenience, there are now two pages on this site with links to various material relating to Gödel and the Incompleteness Theorem


– a page with general links:

Gödel Links


– and a page relating specifically to the Gödel mind-machine debate:

Gödel, Minds, and Machines


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