I agree with others who have suggested that there is a problem with the m/c. Once sorted out, you might like to try Stahlbus bleeder valves (https://www.stahlbus.com/products/en/bleeding-system/index.php). I fitted a pair of these on my SP3 after reading some positive comments by @Topolino. Impressed with them.
+1 for the stahlbus bleed valves. I fitted them to my v4 on front and back brakes and clutch. Make it much easier (and less messy) to get firm lever.
Plus one as a vote against All Balls. They had some supplier QC issues a few years back and, in the internet world shit sticks, but, according to the distributor here that’s not been the case for many years. However, personal experience dictates otherwise and over the past 24 months I’ve had 3 instances where I have had issues with their fork seals all due to tolerances on sizes. After the 3rd time I vowed to myself never to use them again. Yes, they’re cheap but they’re cheap for a reason.
