X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 17 Jun 2007 13:01:39 -0400 Message-ID: X-Original-Return-Path: Received: from [206.246.194.60] (HELO visi.net) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2107644 for lml@lancaironline.net; Sun, 17 Jun 2007 08:53:02 -0400 Received-SPF: none receiver=logan.com; client-ip=206.246.194.60; envelope-from=rpastusek@htii.com Received: from [69.143.130.212] (HELO DLHTPAX009) by visi.net (CommuniGate Pro SMTP 4.2) with ESMTP id 216221009 for lml@lancaironline.net; Sun, 17 Jun 2007 08:51:54 -0400 From: "Robert Pastusek" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] SS Teflon Hoses vs SS Rubber hoses X-Original-Date: Sun, 17 Jun 2007 08:52:14 -0400 X-Original-Message-ID: <003101c7b0de$56e2f050$04a8d0f0$@com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcewmIQIBZnemqvtSdyE17P8QA9mHgAQ9bkg Content-Language: en-us Rick Titsworth was advised: (for our brake line hoses) that since the Teflon liner is typically thinner than a standard SS rubber hose liner, that there is a risk of a broken SS braid wire piercing the Teflon and initiating a leak. Any confirmation of my A&P's comments above (or is it an OWT - old wise tale). Rick, Two comments. In our application, there is almost no flex of the brake lines in normal operation. The risk of an internal puncture from a broken shield wire seems to be extremely remote to me. This is a concern if the hose has been damaged or sharply kinked during installation or service, but not for normal operations. Second, the actual flow through these lines is very small. Lots of builders have used high quality very high pressure 1/8" lines to improve reliability without problems. The result of a too-small line will be a delay between foot pedal depression and brake application--this is definitely not good, as it will cause you to "over apply" brakes, especially during emergency application, but the differences you are considering should have no noticeable effect at all. Hope this helps. Bob Pastusek