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Hello @Jeepsinker, You were correct the problem is only in the Master Cylinder. TLDR; The little rubber valve at the end of the spring may have perished shut preventing flow in either direction. Interesting that the same problem showed up on the replacement, therefore age of master cylinders is...

Hello, Thank you for you reply. The pedal return spring is present and does return the pedal. The master cylinder and air pack are NOS from Big Mike and have the same problem that the previous master cylinder and air pack had. My 1967 M109A3 is older and has not had this problem and is driven...

Hello, I am having the same problem the brake master cylinder plunger is not returning immediately when I release the brake pedal. It was all working fine and then I did not use the truck for a couple of months. Checked the brakes and the pedal went loose, initially thought that there was a...

@rustystud Thank you for the advice - where do I find the neoprene seals ?

Update on the water pump - The vehicle has not been driven much since all the new cooling system parts have been installed. Today I popped the hood and started her up. Always amazed at the instant start even after sitting for nearly a month. The laser thermometer is showing temps below 170...

TL;DR; Summary. NOS Water Pumps will weep for 10 to 15 minutes after installation, mount the water pump with the weep hole up so that you can see when it stops weeping. If you are worried about debris falling in the hole coat it with some grease. If the seal starts to fail the water will push...

Thank you for your replies. There appears to be a range of answers, here and on the web. For example this site http://www.galvanizeit.org/hot-dip-galvanizing/how-long-does-hdg-last/in-contact-with-other-metals has a table at the bottom of the page that implies that aluminum rivets with...

I am removing the roof panels on my M109A3 shop van. The rivets appear to be aluminum, they are non magnetic and drill out really easily. The sheet metal is steel; I was under the impression that aluminum would deteriorate more quickly when in contact with steel. What type of rivets should I...