All of the Honda CX and GL V-twin family have a hydraulic disc brake up front - some single sided, some dual sided, some with one piston, some with two. Check out our articles below!
Depending on the country and year model, your twisted twin may have a single front disc brake with a single piston caliper, a single front disc brake with a dual-piston caliper, a dual front disc brake with single pistons or a dual front disc brake with dual pistons. The single piston front disc brake on the dual-sided setup looks like this:
The early single sided CX500s had a 276mm rotor with a min. thickness of 6mm and a 43mm piston; the dual-sided CX500s (excluding the E/T) had 38mm pistons and 240mm discs that had a min. thickness of 4mm.
By now many of the brake lines that came from the factory are rather a lot worse for wear and age; upgrading to stainless steel braided lines is getting fairly common, and is recommended.