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you could fit the discs with the bearings in but im sure if you removed the disc an ats style place would only want £5 to £10 just to swap the bearing over.
the light can mean anything from an engine misfire to a faulty cat.anything that causes the engine to run poor and potentially increase emissions will cause the light to come on.from your explanation its sounds like the engine has a misfire at high revs which will eluminate the light.
a knock sensor is a peizro crystal type sensor.it is a vibration type peizro sensor so unlike other peizro crystal sensor(map sensor)it doesnt req a voltage to work.the sensor contains a ceramic element which is clamped between the sensor base and the sensor securing nut(internal cannot be...
the main areas that ive had for leaks have been from the rocker cover join,a cam seal or the sump gasket.also have a look at the black plugs on the gearbox side of the head as they can sometimes come out and leak oil everywhere.
the click is the full load switch which the cruise control and auto box models req.every clio is fitted with the same pedal so even if you dont have the above systems your pedal will still click.
seeing as you only notice it whilst braking then the problem must be on the brakes.front brakes discs on clios are quite prone to either get corroded or become distorted.