Over the last few months I've probably dismantled more than 20 R8/10 brake calipers.
All but 2 were correctly assembled. That is, the gap in the self adjuster circlip inside the piston was not alligned with the mark on the front of the piston and that mark was not aligned with the bleed screw. This means that sometime in their life all these calipers have been overhauled and reassembled incorrectly.
If they are not overhauled correctly air is trapped in the system and the pedal is spongy.
If you have one of these cars and you dont have a firm pedal then it is fair to assume air is trapped in the system and if this is still the case after a bleed I would suspect air trapped behind the piston
There is a workaround that does not involve overhauling the caliper.
P
All but 2 were correctly assembled. That is, the gap in the self adjuster circlip inside the piston was not alligned with the mark on the front of the piston and that mark was not aligned with the bleed screw. This means that sometime in their life all these calipers have been overhauled and reassembled incorrectly.
If they are not overhauled correctly air is trapped in the system and the pedal is spongy.
If you have one of these cars and you dont have a firm pedal then it is fair to assume air is trapped in the system and if this is still the case after a bleed I would suspect air trapped behind the piston
There is a workaround that does not involve overhauling the caliper.
P