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Is there any delay between pulling lever and pistons moving?
It's a little bit hard to say. Even with the phone screen trick it's a little difficult to see but I'd say that if there is a delay then it seems small. If anything the pads sit fractionally further from the rotor on the rear but I thought HyRd callipers were supposed to adjust this automatically.
"pads were replaced recently with Shimano sintered pads"
How recently? Were they bedded in properly?See ninja edit :-). Resin pads.
Pads were replaced a couple of months ago but I haven't used the bike that much. They have probably covered about 100km of commuting and 4 cross races. I didn't do anything specific to bed them in but presumably they would have bedded in by now even through general use. Visual inspection reveals there to be plenty of material on the pads still (especially on the back!).
I'll try cleaning the pads and rotors and see if that helps.
I'm pretty new to disc brakes, and the Tiagra/HyRd setup on my CdF is really bugging me. The front seems to work perfectly - responsive, good feel, easy endos etc. but the rear is ridiculously soft. Applying the brakes as hard as I can from the hoods only causes me to glide to a leisurely rest and I can only just lock up the back wheel into the feeblest skid if I use the extra leverage of braking from the drops.
I've followed all the setup instructions on the TRP youtube channel a hundred times over... things like undoing and retightening the calliper while the brakes are pulled etc. and I've tried @edscoble's trick of placing a phone behind the brakes to make sure they are correctly aligned but nothing seems to help. The cable housing is the same housing that came otp from Genesis but googling suggests it's trp's compassionless [I'm leaving that autocorrect in there...] housing, and the pads were replaced recently with Shimano resin pads that should be ok and have barely any wear.
Is re-bleeding the rear the next thing I need to do, and is it a faff? Is there anything else I can or should check first?