Without knowing what exactly you are experiencing with these brakes, it would be hard for me to make a direct recommendation, but I can tell you many ways to squeeze out a little bit more performance ...
What if you could find out in 10 minutes or less precisely how each and every one of your tractor-trailer's brakes is working? You'd know how much force they're producing to stop the rig, individually ...
Each time I write about the proliferation and advantages of disc brakes on road bikes, a litany of naysayers parry. Common criticisms: disc brakes are unreliable and finicky, heavier than rim ...