Posted by Dave Horvath [172.69.50.31] on Wednesday, September 26, 2018 at 22:02:55 :
In Reply to: PIF and brake cylider posted by scott56 [172.68.189.82] on Wednesday, September 26, 2018 at 19:52:15 :
Large bore acts on the trailing shoe as it requires more pressure relative to the leading shoe. Drum drags across trailing shoe whereas leading shoe digs into drum. Different bore sizes equalizes pressure. Also known as self-energizing.