CLASS RACER FORUM - View Single Post

ss3011 · 02-03-2011, 06:22 PM

The groove in the piston has a slight slight angle on one side. When the brakes are applied, it make the piston seal deflect slightly. When the brakes are released the seal straightens back up and slightly retracts the piston. Early disc brakes didn't have this feature and they did drag.

02-03-2011, 06:22 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: disc brake springs The groove in the piston has a slight slight angle on one side. When the brakes are applied, it make the piston seal deflect slightly. When the brakes are released the seal straightens back up and slightly retracts the piston. Early disc brakes didn't have this feature and they did drag.