Adjusting B4 rear calipers

[simonthemedic]

Hi, I am recommissioning my b4 2.0E it's been it's standing outside for over a year & having a problem with low efficiency of the handbrake. Anyone know when adjusting it do I need to use the pedal to set the disc pad clearance or pull on the handbrake a few times first then then press the brake pedal.

I have cleaned all the discs, slide pins and carrier brackets, wound the Pistons back in and reassembled everything but the handbrake won't hold it on my reasonably steep driveway yet it did so before