I looked at the photos and noticed the wheel cylinders. I've been overhauling mine for years. In fact I carry a spare kit on the road in case of a failure. Hone them out to smooth install cups with suitable grease, put never seize compound on the pistons and put them in. The never seize has stopped pistons from sticking in the bores and stopped rust. Have not had a failure on my daily driver in many years.
