The Nitro Posted March 13, 2022 Share Posted March 13, 2022 I am working on getting my 2004 mack vision tipper ready for rego and I am hearing and seeing air leaking out of the boot on foot brake where it goes through firewall. Its leaking in the cabin side where pedal pushes on the valve. It leaks air when we press brake pedal lightly but seems to stop leaking if we push pedal hard. I can hear a feint leak from engine bay side when I lift little round rubber flap on brake valve but most of the air seems to leak into cab side of valve. it’s my first truck, Is this normal of not? I can’t hear any leaks there except when we push brake pedal. theres 8 ports on valve 4 up and 4 down theres a number on top of valve 5631 thanks Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/ Share on other sites More sharing options...
Onyx610 Posted March 13, 2022 Share Posted March 13, 2022 No leaks, that’s the treadle valve/foot valve. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492008 Share on other sites More sharing options...
Popular Post Joey Mack Posted March 13, 2022 Popular Post Share Posted March 13, 2022 yep, treadle valve is bad,,, not to hard to change, just pay attention to the plumbing.. mabey get small colored zip ties to mark the lines and fittings.. you got this, Jojo 3 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492013 Share on other sites More sharing options...
theakerstwo Posted March 13, 2022 Share Posted March 13, 2022 Like Joey said dont get the lines mixed up because you cant call anyone and ask were this line goes.I have seen this happen many times. 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492015 Share on other sites More sharing options...
Joey Mack Posted March 13, 2022 Share Posted March 13, 2022 I started to take pictures with my phone in recent years.. it has helped me a few times. but marking the lines is my go to approach. I used too prick punch the fittings and the valve, so when i have it off on the bench, i can swap/replace the fittings with ease.. jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492017 Share on other sites More sharing options...
mowerman Posted March 13, 2022 Share Posted March 13, 2022 That’s what I’m going to do when I pull a part this power generator I wound up with I thought of a video clip ha ha Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492023 Share on other sites More sharing options...
The Nitro Posted March 13, 2022 Author Share Posted March 13, 2022 I will order a new valve and pull this one apart afterwards just to see how it works. Thanks for the tips. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492059 Share on other sites More sharing options...
mechohaulic Posted March 14, 2022 Share Posted March 14, 2022 older style had a couple of springs under the valve plates not hefty just long enough to throw dirt or whatever. point is advised to wear safety glasses not only that project == every one. even greasing . Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492166 Share on other sites More sharing options...
mechohaulic Posted March 14, 2022 Share Posted March 14, 2022 On 3/13/2022 at 3:48 PM, The Nitro said: I will order a new valve and pull this one apart afterwards just to see how it works. Thanks for the tips. one of the best teachers is yourself when taking things apart to see what makes them tick. i never stop preaching safety . Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492167 Share on other sites More sharing options...
doubleclutchinweasel Posted March 15, 2022 Share Posted March 15, 2022 16 hours ago, mechohaulic said: one of the best teachers is yourself when taking things apart to see what makes them tick. i never stop preaching safety . That's how I learned pretty much everything I know. Take it apart and look. But, you are right on the money with the safety aspect. Always be wary of springs and things. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492221 Share on other sites More sharing options...
Onyx610 Posted March 15, 2022 Share Posted March 15, 2022 (edited) All about visuals! Edited March 15, 2022 by Onyx610 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492222 Share on other sites More sharing options...
Popular Post doubleclutchinweasel Posted March 15, 2022 Popular Post Share Posted March 15, 2022 On that R I had, it seems like I replaced practically every single part in the air brake system. It was a pretty good education. Got to be real familiar with the Bendix catalog. Most of the parts are incredibly simple. The last thing I replaced before I sold the truck was the treadle valve. I used the one with the 2-stage spring, so the initial application was easier and got harder after that. One of my earliest memories of a Mack truck was being at the shop with my dad, waiting for them to put a treadle valve in a B model so he could get on the road with it. I was no more than 4 at the time. I literally grew up in the cab of one Mack or another! 3 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492225 Share on other sites More sharing options...
The Nitro Posted March 15, 2022 Author Share Posted March 15, 2022 (edited) Picked up the new valve from freight depot yesterday and took lots of pictures of old valve plumbing and removed it from truck. Got both valves at bench vice and will swap out the fittings and try get same angles tonight after work. Looks like brass tapered air fittings so might get some sort of thread locking goo from town before I start. Most of the air lines had olives on them so not sure how interesting it will be with leaks at the 9 threaded fittings and 12 air lines I had to undo to get brake valve out Edited March 15, 2022 by The Nitro Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492254 Share on other sites More sharing options...
Joey Mack Posted March 15, 2022 Share Posted March 15, 2022 just curious.. aside from being a fruit, what is an 'Olive'? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492256 Share on other sites More sharing options...
Onyx610 Posted March 15, 2022 Share Posted March 15, 2022 I’m curious too! Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492260 Share on other sites More sharing options...
mrsmackpaul Posted March 15, 2022 Share Posted March 15, 2022 Olives are these things for airlines, well at least thats what they are called out here Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492263 Share on other sites More sharing options...
Joey Mack Posted March 15, 2022 Share Posted March 15, 2022 ferrells... That is so funny... And I love olives as well... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492264 Share on other sites More sharing options...
mechohaulic Posted March 16, 2022 Share Posted March 16, 2022 4 hours ago, mrsmackpaul said: Olives are these things for airlines, well at least thats what they are called out here Paul once again another fact is proven . no matter how long a person does a job , there's always room for new knowledge . after 50 yrs wrenching never knew they were olives. i know plenty of times when the line wouldn't move i called the brass ferrells alot of other names. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492350 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted March 16, 2022 Popular Post Share Posted March 16, 2022 Ferrals, now thats a whole different kettle of fish We can go a bit ferral but dont wanna be known as ferral, to be ferral in Australia might be like you blokes call white trash Anyway thats probably going near political correctness to much but I think you get my drift Paul 2 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492352 Share on other sites More sharing options...
Popular Post doubleclutchinweasel Posted March 16, 2022 Popular Post Share Posted March 16, 2022 Yep. "Ferrules". Not to be confused with "feral", as in wild pig, wild dog, etc. Never heard them called olives. But, I like it! Some of the manufacturers call them "sleeves". But, could a "feral" pig eating "olives", wearing long "sleeves" have a "ferrule" on his tail? How much wood could a woodchuck chuck... 1 3 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492363 Share on other sites More sharing options...
The Nitro Posted March 17, 2022 Author Share Posted March 17, 2022 HAhaha, you guys. So the treddle valve job went ok but I have 1 of the short 1/2 inch hard plasic lines going up to the governor/regulator valve not playing the game and leaking air so need a couple more bits and pieces for that. The next job on the list is the leaking tipper ram seals. I’m not trusting the single safety beam prop on one side thats on the truck so will have to make a better one before I climb up in there to pull cylinder out. Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492507 Share on other sites More sharing options...
doubleclutchinweasel Posted March 17, 2022 Share Posted March 17, 2022 2 hours ago, The Nitro said: HAhaha, you guys. So the treddle valve job went ok but I have 1 of the short 1/2 inch hard plasic lines going up to the governor/regulator valve not playing the game and leaking air so need a couple more bits and pieces for that. The next job on the list is the leaking tipper ram seals. I’m not trusting the single safety beam prop on one side thats on the truck so will have to make a better one before I climb up in there to pull cylinder out. TAKE ABSOLUTELY NO CHANCES UNDER THAT BED. I SAW A MAN DIE UNDER ONE ON AN R35 EUCLID. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492516 Share on other sites More sharing options...
theakerstwo Posted March 17, 2022 Share Posted March 17, 2022 Cause once you see it falling and your eyes get around to telling your brain that you need to move its too late like your only a spot of grease from now on.Please brace it up more than good. 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492518 Share on other sites More sharing options...
Joey Mack Posted March 17, 2022 Share Posted March 17, 2022 If anyone tells you any B.S. tell them to go away, or you go away.. I was almost cut in half by an employee of mine, we were working on a Cat V-250... older lift. I was setting it up to replace lines and I had the forks up and was fixing a chain, to hold it up and I had long 4x4's ready to put in the channels as an extra helper, and dum dum was starting to take line clamps off and lines.. If I didnt see him, he would have possibly pulled a line that would have changed both our lives.. anyway... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492519 Share on other sites More sharing options...
The Nitro Posted March 18, 2022 Author Share Posted March 18, 2022 I’m planning to drill a 5ft deep hole with the post hole digger on skid steer and position the truck over hole so that the only cross beam of body is over the hole when its at 2.8 meters high. Drop air from airbag suspension and chock all the wheels and park brakes on. Undo the top ram bolts with body fully down and attach some type of ratchet strap to top of ram that I can use to collapse ram if it wont come down itself by gravity. Raise body with ram and Cut a fresh wooden post from a box tree trunk about a ft diameter and put it down through chassis into my hole fill it in with dirt so its solid and the top of post is the right height to compliment the factory body prop thats fitted to truck already. lower body onto post and prop and put a log across rear of chassis rails as well. Lower ram with gravity or my pre installed ratchet strap up on top of ram and put my skid steer forks straddling the top half of ram main body tube and sling ram to forks and lift out when rams fully down and base unbolted. should be able to put ram back in and raise it with pump between my forks as a guide up into truck body top mount and take the weight. Chainsaw my post out then remove factory prop last and lower body fully then get top bolts in last after its all back down. Thats about the best way I can come up with that minimises the amount of time I need to be in there which is to tie ram to my forks and to ratchet the ram down to collapse it if needed. I dont like the idea of a short prop at rear of body near hinge point as I have seen that rear pin fail once and a fail there would still see a guy squashed under front of body as rear would simply see saw upwards if the hinge failed and front of body would drop as its heavier. Before I do this, anyone see something I’m missing with the plan I described? Thanks, Quote Link to comment https://www.bigmacktrucks.com/topic/69378-foot-brake-valve-leak-in-cab/#findComment-492577 Share on other sites More sharing options...
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