The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**MikeB** · 10-26-2017, 11:25 AM

Wow, that's scary stuff.

Definitely a good reason to rebuild like Jcfcamaro did. That's assuming you already have a factory valve.

Heck, when I converted a 69 C10 to power disc brakes around 1995, I got all the parts off a 71-72 junkyard truck. To this day, the prop valve still works fine. The booster diaphragm started leaking in the late 90s, so I had it rebuilt. I replaced the master cylinder sometime around 2012 for no reason other than the thing was very rusty. Found an NOS Raybestos-labeled M/C that was in a very nasty box that was nearly falling apart. Think I paid $17 for it at RockAuto! It's tough to beat those old USA made parts.

Hard to believe Pirate Jack doesn't immediately stop selling the prop valves and do a recall on them. I mean their liability would be HUGE if one of these things fails during a high speed stop.

10-26-2017, 11:25 AM	#9
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,425	Re: New Proportioning Valve Leaking Wow, that's scary stuff. Definitely a good reason to rebuild like Jcfcamaro did. That's assuming you already have a factory valve. Heck, when I converted a 69 C10 to power disc brakes around 1995, I got all the parts off a 71-72 junkyard truck. To this day, the prop valve still works fine. The booster diaphragm started leaking in the late 90s, so I had it rebuilt. I replaced the master cylinder sometime around 2012 for no reason other than the thing was very rusty. Found an NOS Raybestos-labeled M/C that was in a very nasty box that was nearly falling apart. Think I paid $17 for it at RockAuto! It's tough to beat those old USA made parts. Hard to believe Pirate Jack doesn't immediately stop selling the prop valves and do a recall on them. I mean their liability would be HUGE if one of these things fails during a high speed stop. __________________ Mike 1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!