Refined Trucker Posted December 6, 2014 Share Posted December 6, 2014 Wanting to add spring brakes to front drive. I only have them on rear and they are not always enough. Can you just T into existing lines to add on or is there a better way? Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/ Share on other sites More sharing options...
carlotpilot Posted December 6, 2014 Share Posted December 6, 2014 i would use existing lines and add another quick dump valve for the front Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-269271 Share on other sites More sharing options...
Ezrider Posted December 6, 2014 Share Posted December 6, 2014 i don't see why you coulden't t- into the existing lines, iv thought of doing the same, my mack and my other truck both only have maxi's on one drive axle and sometimes on a steep hill it wont hold it. in the occasional times a year i have to park on a steep incline i normally just end up popping the trailer breaks as well. Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-269276 Share on other sites More sharing options...
Popular Post thomastractorsvc Posted December 6, 2014 Popular Post Share Posted December 6, 2014 For about the same money (by the time you buy the T and fittings) buy this and do it right. http://www.ebay.com/itm/R14-R14H-Replacement-Air-Brake-Relay-Valve-Horizontal-Ports-New-No-Core-103010P-/170774218041 3 Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-269280 Share on other sites More sharing options...
j_martell Posted December 6, 2014 Share Posted December 6, 2014 Are we talking front drive axles of a tandem, or the steer axle?? Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-269290 Share on other sites More sharing options...
Refined Trucker Posted December 7, 2014 Author Share Posted December 7, 2014 Tandem drives. Thanks for input guys. The eBay valve does look to be the way to go. Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-269433 Share on other sites More sharing options...
thomastractorsvc Posted December 8, 2014 Share Posted December 8, 2014 You might be able to buy one local for less money I added the ebay link so you could see one with the part number the valve should have instructions in it Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-269583 Share on other sites More sharing options...
Keffer inc Posted January 20, 2015 Share Posted January 20, 2015 Will DOT say anything if you just tee them? Ive want to do this too when the service chambers go out. Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-275139 Share on other sites More sharing options...
Refined Trucker Posted February 7, 2015 Author Share Posted February 7, 2015 I would think not. Especially if the T is up on frame by the valve they probably won't even notice. My experience is that they are mainly concerned with brake condition and adjustment Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-277842 Share on other sites More sharing options...
MackTech Posted March 22, 2015 Share Posted March 22, 2015 You can take the plugs out of the Bendix SR7 valve and run the hoses direct to the spring fittings, no need for Ts Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-283518 Share on other sites More sharing options...
MackTech Posted March 22, 2015 Share Posted March 22, 2015 You can take the plugs out of the Bendix SR7 valve and run the hoses direct to the spring fittings, no need for Ts Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-283519 Share on other sites More sharing options...
Underdog Posted March 22, 2015 Share Posted March 22, 2015 You can take the plugs out of the Bendix SR7 valve and run the hoses direct to the spring fittings, no need for TsThis is exactly what I did on my CX years ago. on dump trailer you need the holding power of 2 axle brakes.Gregg Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-283530 Share on other sites More sharing options...
felicello122 Posted March 22, 2015 Share Posted March 22, 2015 Alot of trailers use the t right on the camber,usually one feed line and one chamber to chamber Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-283600 Share on other sites More sharing options...
Keffer inc Posted March 26, 2015 Share Posted March 26, 2015 Yep, I noticed that on almost all the container chassis around here. Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-284190 Share on other sites More sharing options...
MackTech Posted March 27, 2015 Share Posted March 27, 2015 That's how Mack use to do it..... There was an aluminum block mounted on the carrier with a line to each spring chamber Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-284224 Share on other sites More sharing options...
MackTech Posted March 27, 2015 Share Posted March 27, 2015 That's how Mack use to do it..... There was an aluminum block mounted on the carrier with a line to each spring chamber Quote Link to comment https://www.bigmacktrucks.com/topic/37988-adding-spring-brakes/#findComment-284225 Share on other sites More sharing options...
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