N3me-350z Posted November 11, 2014 Share Posted November 11, 2014 So I'm having an issue and wondered if someone can help, I've recently gone supercharged and I've now noticed that if I'm pushing hard and slam the brakes on It takes a split second or so for the brakes to engage, can be quite worrying because it feels as if the cars not going to stop, then suddenly it brakes as normal. So only thing I can think of is I changed to a cosworth intake a while before and had to change the brake hose for a longer one and maybe this new hose is collapsing now when it the intake pressure goes from boost to vacuum. Only happens when I'm really pushing the car. Does anyone have an idea what it might be? I'm guessing first thing I should do is get a better vacuum hose and try that but just wondered if anyone else has experienced this? Quote Link to comment Share on other sites More sharing options...
GMballistic Posted November 11, 2014 Share Posted November 11, 2014 Did you put a non return valve in between your brake servo & plenum? I've had this done on my supercharged Zed as the garage that fitted it recommended doing it to prevent boost pressure affecting the brake servo. Non return valve I bought is this one: http://www.carbuildersolutions.com/uk/nylon-non-return-valve-10mm I would say check out my build thread but don't think I have a picture. I'll try to take one now for you. 2 Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 11, 2014 Author Share Posted November 11, 2014 Awesome thanks, no I don't have a non return valve fitted between servo an plenum, I'll buy one and give it a try Quote Link to comment Share on other sites More sharing options...
GMballistic Posted November 11, 2014 Share Posted November 11, 2014 Ok so it's a terrible picture but in my defence I live in Wales & it is pi**ing down outside. You can see the non return valve in the pipe leading to the servo. Hope that helps & let us know how you get on. Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 11, 2014 Author Share Posted November 11, 2014 Ok cool cheers for help, infact I've just found one in my box of goodies, hopefully this will be good enough, what do you think? Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 11, 2014 Author Share Posted November 11, 2014 Opps here's the pic Quote Link to comment Share on other sites More sharing options...
GMballistic Posted November 11, 2014 Share Posted November 11, 2014 Ok cool cheers for help, infact I've just found one in my box of goodies, hopefully this will be good enough, what do you think? Do you have a picture then? If it's a non return valve & fit's the pipe then it should work. Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 11, 2014 Author Share Posted November 11, 2014 Looks a bit cheep lol but seems to work when I blow through it and it's 10mm 1 Quote Link to comment Share on other sites More sharing options...
GMballistic Posted November 11, 2014 Share Posted November 11, 2014 Opps here's the pic Just check it works first by blowing through it. Hard to tell from the picture but can't hurt to give it a try. The nylon one I linked though from Car Builder Solutions is a very solid little piece so should the other one not be up to the task then it's not exactly an expensive part to try. Quote Link to comment Share on other sites More sharing options...
GMballistic Posted November 11, 2014 Share Posted November 11, 2014 Beat me to my response. Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 11, 2014 Author Share Posted November 11, 2014 Yeah exactly I'll probably just get one you posted anyway as it's a proven item. Will try this out tomorrow and let you know if it's worked, thanks Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 11, 2014 Author Share Posted November 11, 2014 I'm good at doing that, I also tend to start talking at the exact same time someone else does lol 1 Quote Link to comment Share on other sites More sharing options...
GMballistic Posted November 11, 2014 Share Posted November 11, 2014 Yeah exactly I'll probably just get one you posted anyway as it's a proven item. Will try this out tomorrow and let you know if it's worked, thanks No problem ~ Fingers crossed it fixes the problem and that's all it was. Quote Link to comment Share on other sites More sharing options...
Keyser Posted November 11, 2014 Share Posted November 11, 2014 I had that problem - standard pipe has one in - I think I blew mine up - I just replaced the pipe and that solved the problem. Double tap the brakes also gets round the problem - I first discovered the exact same brake fail coming into quarries at CC at around 125mph Hit the brakes nothing - release and press - Phew : I assume it is because when you come off high boost the pressure in the plenum goes positive before the blow off valve releases it, servo uses vacuum and you don't get any at that point. Hope the new valve gets you sorted Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 11, 2014 Share Posted November 11, 2014 There will be a one way valve fitted to the servo, but its not intended for FI so I would suspect that its being overwhelmed while on + boost and thats whats causing your problem. Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 11, 2014 Author Share Posted November 11, 2014 Cheers guys hopefully the one way vavle will sort it otherwise I'll get a better hose and try again Quote Link to comment Share on other sites More sharing options...
N3me-350z Posted November 13, 2014 Author Share Posted November 13, 2014 Fitted the non return vavle and all seems fixed, I've tried a good couple of full speed brakes and it feels nice and responsive now cheers for the help guys 1 Quote Link to comment Share on other sites More sharing options...
Keyser Posted November 13, 2014 Share Posted November 13, 2014 (edited) Useful for other FI builders to note this as well Edited November 13, 2014 by Keyser 1 Quote Link to comment Share on other sites More sharing options...
jumping350 Posted November 13, 2014 Share Posted November 13, 2014 noted and bought two today Quote Link to comment Share on other sites More sharing options...
GMballistic Posted November 13, 2014 Share Posted November 13, 2014 Fitted the non return vavle and all seems fixed, I've tried a good couple of full speed brakes and it feels nice and responsive now cheers for the help guys Great stuff ~ glad it's fixed & we helped. Quote Link to comment Share on other sites More sharing options...
Sam Mcgoo Posted November 13, 2014 Share Posted November 13, 2014 Good info. Not a problem I have come across as yet but I have the OEM hose fitted still. If it happens in the future, I'll know where to go. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted April 30, 2015 Share Posted April 30, 2015 Just spotted this thread. IF my oem one requires replacing, does it matter which material (nylon or aluminium) ? Quote Link to comment Share on other sites More sharing options...
GMballistic Posted April 30, 2015 Share Posted April 30, 2015 Just spotted this thread. IF my oem one requires replacing, does it matter which material (nylon or aluminium) ? No it won't matter imo. 1 Quote Link to comment Share on other sites More sharing options...
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