h67st Posted March 9, 2021 Share Posted March 9, 2021 I'm using all Bendix brake valves and nylon lines on my truck; this is an R12 relay valve for the service brakes. What size control line should I use from the treadle valve...3/8" or 1/2"? If anyone has a service brake relay valve on their truck, could you look at what size your line is? Thank you! Quote Link to comment Share on other sites More sharing options...
h67st Posted March 9, 2021 Author Share Posted March 9, 2021 The control line port is 1/4 pipe by the way. Seems more like a 3/8 line; if they want you to use 1/2 they should have put 3/8 pipe threads there. Quote Link to comment Share on other sites More sharing options...
Popular Post Joey Mack Posted March 9, 2021 Popular Post Share Posted March 9, 2021 I just put this on a superliner that I am re-doing. I used 3/8" line to the pilot port on top... it works just fine, just supply the vavle with 1/2" or 5/8" from the tank.. the valve knows what to do.. jojo 3 Quote Link to comment Share on other sites More sharing options...
h67st Posted March 10, 2021 Author Share Posted March 10, 2021 Thank you Joey! Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted March 10, 2021 Share Posted March 10, 2021 👍 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.