WesleySands Posted September 10, 2014 Share Posted September 10, 2014 This may be more on the legal side of things than the actual mechanic side but, why are you no allowed to use compression couplings when fixing brake lines? One mechanic said that they're perfectly fine to use, they've been barred for legal reasons, is that true? I realise with flaring that the line would have to break before the coupling went out. So why flare vs. using compression couplings? I've done very little brake work, so I'm still learning. Thanks. Link to comment Share on other sites More sharing options...
Max Capacity Posted September 11, 2014 Share Posted September 11, 2014 It's one of the safety laws, I guess. I test fluid and gas lines at work, We use compression fittings for pressures up to 6000psi. The flare gives a better overall seal but compression fittings will hold too. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
WesleySands Posted September 14, 2014 Author Share Posted September 14, 2014 That's what I figured it was a legal thing. Link to comment Share on other sites More sharing options...
starionesir Posted September 15, 2014 Share Posted September 15, 2014 I've seen flares break off in a couple different applications not just automotive. And as max said compression fitting can hold alot of pressure. I'm sure someone decided the compression was more prone to a failure then flares. Or maybe more prone to failure by poor installation. Link to comment Share on other sites More sharing options...
gtonstilts Posted September 15, 2014 Share Posted September 15, 2014 i have always done a double flair Link to comment Share on other sites More sharing options...
aperson Posted September 26, 2014 Share Posted September 26, 2014 I'd say illegal due to poor installation causing problems. I've always done double flare as well. Link to comment Share on other sites More sharing options...
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