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post #1 of (permalink) Old 26th March 2014 Thread Starter
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Scenic Caliper Cleanup

Hi all.

If this needs to move or isn't wanted please do so.

Whilst waiting for parts for the engine I'm rebuilding I decided to give the other front end mechanicals a bit of a going over.

Although the brakes worked well on the Scenic it seemed a good opportunity to clean them up and check them over.

Front left shows heavy surface corrosion.

After descaling with an air tool and a quick rub over with a wire brush, the caliper was left for 24 hours in a electrolysis tank. Really it's just a plastic dustbin filled with water and around a 1Kg of washing soda. In the bottom of the bin is a small wheel rim and around the edge 4 steel rods that are connected to the positive lead of a battery charger and the item to be treated is connected to the negative lead. In the process the positive parts (wheel rim and steel rods) are eroded so it's important not to let the crock clip touch the electrolyte (water and washing soda solution).

24 hours later the caliper looks like this. Note that the piston is fully retracted and the fluid chamber is sealed off with a bolt and locknut. The nipple is closed too.

The rust and rusty paint peels away in flakes.
Caliper mounting bracket.

After drying them out a thorough cleanup with a wire brush gives this finish.

More to follow.
Currently in steelcityuk's garage:
Scenic 2 1.9 DCi 130. Scenic 2 1.5 DCi 100. Citroen XM SED
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