On Tue, 11 Dec 2018 14:54:43 -0800 (PST), Sir Ridesalot
wrote:

Hi there.

I put Interupter levers on an MTB Drop bar bike with cantilever brakes and now drop bar levers feel spongy. The interrupter levers feel fine. Any ideas why the two different types of brake levers feel so different? I did NOT have this problem when I did the same thing to my touring bike also with cantilever brake calipers.

Thanks and cheers.

Possibly the cable housing. If I remember correctly the main brake
levers pull the cable while the interrupter levers push against the
cable housing (for want of a better name).

cheers,

John B.