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 https://www.bigmacktrucks.com/topic/66189-brake-line-size/ 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 https://www.bigmacktrucks.com/topic/66189-brake-line-size/#findComment-470288 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 https://www.bigmacktrucks.com/topic/66189-brake-line-size/#findComment-470296 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 https://www.bigmacktrucks.com/topic/66189-brake-line-size/#findComment-470344 Share on other sites More sharing options...
Joey Mack Posted March 10, 2021 Share Posted March 10, 2021 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/66189-brake-line-size/#findComment-470346 Share on other sites More sharing options...
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