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Brake switch C4 replacement .pdf

Original filename: Brake switch C4 replacement.pdf
Title: FAQ205
Author: Ham

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Frequently Asked Questions
C4 Brake Switch causing ESP/ABS fault or Speed limit error message, Switch replacement guide.

The C4 is prone to an ABS, ESP or Speed Control Limit error message which is invariably caused
(but not always) by a faulty brake switch sending an erroneous message to the ECU
Hopefully I have fixed the problem, here is a how to.
In the passenger foot well, there are three plastic rivets which need to be removed and placed safely

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They are easily removed by griping the inner part and pulling out.

Here's the Switch which comes as a kit with a new loom which I was told has a resistor in it.
To remove the switch, grip and rotate the switch 90 degrees anti clockwise, the disconnect the connector.

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When replacing the old switch for the new one, you need to set the plunger new switch to the same length
as the old one. This is done by pushing or pulling taking care not to damage it.

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This photo shows where to measure/compare the "plunger"

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Replace the switch by pushing it into the hole and rotating clockwise 90 degrees. turn on ignition and check
that the brake lights work, if not the switch plunger might not be set to the correct length.
Hopefully now you won't have the ESP/ABS warning.
The loom simply plugs in to replace the old one.
Part numbers are:
453467 for the kit (switch and wiring loom). RRP £27.95 Inc VAT (Jan 2012)
Prices will vary due to Citroen pricing policy, exchange rates, VAT changes, dealers pricing policy, etc. etc.
and are for guidance only.


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Info 25 June 2010 by Ham

C4 - DS4 Owners

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