I’d be interested to hear if you reach a conclusion on this John. It’s something I’ve been struggling with recently. I had a live axle 7 for years & traded it in for a 2017 420R last year. I wasn’t happy with the brake pedal feel on the 420 from the beginning. I was convinced there must be air in the system, after all I was going from the standard front callipers & master cylinder & 1970s British Leyland rear drums to a modern AP Racing set up, with discs at the rear (albeit, not the ‘big brakes’ uprated set up). But despite pumping numerous bottles of brake fluid through the system, the pedal still doesn’t feel as confidence inspiring as my previous car. The brakes do stop the car & it passed it’s MOT last month without any problems, but the pedal still feels a bit mushier than I feel it should. I’ve tried the traditional ‘two person’ method, a Gunson Easy Bleed & a vacuum bleeder. I’ve also tried bleeding the rear callipers with the pads removed & the pistons wound back, this method failed to produce any further air bubbles, so I can’t help but feel there isn’t any further air trapped in the rear callipers. Admittedly the pedal feel has improved quite a bit, in comparison to how it originally felt, but I can’t help feel there’s still room for improvement. I haven’t tried the ‘handbrake wiggle’, so maybe I should give that a go? I did slacken off the handbrake adjuster nut whilst bleeding the rear callipers & then gave the brake pedal a few hard presses before re-adjusting the hand brake. I hope you manage to sort yours out. Any more ideas would be appreciated! Cheers! Nigel.