Bombsquad Posted March 7, 2011 Share Posted March 7, 2011 Hey lads, wondering if anyone could tell me if there is such a thing as a one way valve (pcv valve style) to go in break lines? Eg say you have two pedals individually controlling one calliper (2 master cylinders/resovuars) through a double banjo fitting, i need a way to stop the fluid bypassing the calliper and going back up the opposing line Quote Link to comment Share on other sites More sharing options...
KKtrips Posted March 7, 2011 Share Posted March 7, 2011 you have one flaw - how is the fluid going to return from the calliper - ie you will get one brake application and then the brakes will be locked up till you undo the bleed nipple.. perhaps run down what you are trying to achieve and there may be a better solution Quote Link to comment Share on other sites More sharing options...
JoKer Posted March 7, 2011 Share Posted March 7, 2011 hydro handbrake has something similar so it doesnt pump the fronts via feedback Quote Link to comment Share on other sites More sharing options...
Valiant Posted March 7, 2011 Share Posted March 7, 2011 Hydraulic handbrake? Run the master cylinders in line, or add an extra pair of rear calipers with a separate hydraulic circuit. Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted March 7, 2011 Share Posted March 7, 2011 shuttle valves are used in hydro handbrakes. they use them in topdressing plane loader trucks that have the rear mounted cab that you drive it from to load the plane. shuttle goes in the clutch line. yuh prolly get one from apex auto centre in hamiltown. i think that's where i got a couple in about 2004 Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted March 7, 2011 Author Share Posted March 7, 2011 Shuttle valve you say, are they very big cos for it to work how i want it would have to be small (like the size of a small pcv valve) I did make something myself using a double banjo bolt drilled out and with a sprung ball bearing inside it, so spring held ball bearing up blocking off the top line (aided by pressure from lower line), and then when upper line was used it pushed bearing down sealing off bottom line, however it was very hard to get machining right and sealing correctly Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted March 7, 2011 Share Posted March 7, 2011 yeah. I'm pretty sure that's where i got them from. My memory is hazey at best and it was two jobs ago. hah. If you can't get them from there, go find a topdressing outfit and find out who builds their trucks. these things. the second cab at the back runs a seperate clutch master cylinder. the brakes are done a different way being air over hydraulic rather than straight hydraulic/vac over hydraulic. so they run a shuttle valve which is pretty much what you tried to make. I'm pretty sure when I finally tracked them down, you could get them in 3/6" 5/16" and 3/8" bundy tube sizes. 3/16" being the common 'car' sized pipe. wasn't really very big at all. Quote Link to comment Share on other sites More sharing options...
Poo Posted March 7, 2011 Share Posted March 7, 2011 Yeah you can get them. My brothers alfa needed one. You want me to find out where he got it from? Quote Link to comment Share on other sites More sharing options...
Jase Posted March 7, 2011 Share Posted March 7, 2011 or 2 electric line locks would work, switch it on to block and just have it on a toggle switch about a $100 each from bnt what application is it for? Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted March 9, 2011 Share Posted March 9, 2011 http://www.trademe.co.nz/a.aspx?id=360067849 Looks to be what Aidan requires UJ? Quote Link to comment Share on other sites More sharing options...
Poo Posted March 9, 2011 Share Posted March 9, 2011 ^ that looks like what my brother uses on his alfa. Quote Link to comment Share on other sites More sharing options...
boso Posted March 9, 2011 Share Posted March 9, 2011 Shuttle valve best option i think because it will let the pressure return to tank as oil aways takes the esay path of flow. An one way check valve in each line wont work as both checks will block off wen u let pressure off and lock brake up. you can buy them from enzed or hydraulink go into a place like them tell them wot u wont to do they shod sort you out. cut away of a Shuttle valve Quote Link to comment Share on other sites More sharing options...
DavidTheCreator Posted March 10, 2011 Share Posted March 10, 2011 my old mans work has made a couple of those 2 way fire trucks before, will hit him up and see where and how much shuttle valves are, send me pm if intertested. Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted March 12, 2011 Author Share Posted March 12, 2011 Looking at that cut away of the shuttle valve it would appear to be ideal, one line coming from hand brake, one from foot brake and then the main line to the calliper. My next question then is the thing im using it for is going to be shaking all over the place, the bearing is obviously free to roll round so how likely is it that the shake push the bearing and allow fluid to bypass. Or even affect the calliper returning to normal position and draging? I think it might be one of those thing i just have to try and see if it works. Hopefully it wont be to expensive Quote Link to comment Share on other sites More sharing options...
boso Posted March 13, 2011 Share Posted March 13, 2011 the shaking wood be no problem use them all the time in plumbing up excavator attachments and they get a very hard life. maybe a return spring on the brake pedal and a common brake fluid reservoir so u dont get one reservoir over filling and one emptying. what is this set up going on? Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted March 13, 2011 Share Posted March 13, 2011 why cant you run the hand brake master inline between foot and caliper? Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted March 17, 2011 Author Share Posted March 17, 2011 I cant use common resovuar as far as i know due to the way the setup will run. Its being used on my stunt bike to allow me to run a rear foot brake and a hand brake off the single original rear calliper. Seeing as its my day off work and im already bored i thought id get some mad sick ms paint skills crankin and show you all what im trying to do. Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted March 17, 2011 Share Posted March 17, 2011 that'll be saweeeeeet I reckon you'll wanna maybe run the handbrake master a little 'low' on fluid level, and perhaps upgrade the footbrake master if it's one of those micro ones liek on some bikes, just in case it wants to purge back into the wrong cylinder. it *should* return to where it's come from, though. Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted March 17, 2011 Author Share Posted March 17, 2011 Yeah the fluid going to the wrong cylinder was one of the things i wondered about, foot brake master will be sweet. If anyone can come up with a way of running one central resovuar that would be awesome though Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted March 17, 2011 Share Posted March 17, 2011 if you could get a remote reservoir hand end it'll be as easy as running a tee, then a flexi hose all the way to the pedal. being a stunter, it'll be lol, though, if you drop it, spraying like a million litres of brake fluid everywhere. Quote Link to comment Share on other sites More sharing options...
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