No, I would recommend oem pads in all systems. I have no great knowledge of ABS 1 or 2 or indeed the system fitted to the ST13. The front and rear systems are essentially linked in the CBS bikes and as far as I'm aware the SMC is the animal which allows the linking of pressure front and rear. But I can't see the SMC displaces any great amount of fluid and if it did it would only be to the parts of those systems which are linked.
By that I mean the SMC does not apply pressure to all of the rear brake, only the linked part.
I won't elaborate further because I'm not fully aware of what pistons are operated by the SMC. Someone will know and I think John Heath has posted diagrams on here which show this in detail. It'll probably be on SMC threads, of which there are plenty, because they cause issues.
Upt.
By that I mean the SMC does not apply pressure to all of the rear brake, only the linked part.
I won't elaborate further because I'm not fully aware of what pistons are operated by the SMC. Someone will know and I think John Heath has posted diagrams on here which show this in detail. It'll probably be on SMC threads, of which there are plenty, because they cause issues.
Upt.