---------------------------------------------------------- RV8-List Digest Archive --- Total Messages Posted Wed 10/29/08: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:09 AM - Re: Question On Low-Pressure Brake Lines... (Christopher Stone) 2. 07:56 AM - Re: Question On Low-Pressure Brake Lines... (manuel weber) 3. 10:03 AM - Re: Question On Low-Pressure Brake Lines... (James Baldwin) 4. 01:46 PM - Re: Question On Low-Pressure Brake Lines... (david wilder) 5. 04:32 PM - Re: Question On Low-Pressure Brake Lines... (William Slaughter) ________________________________ Message 1 _____________________________________ Time: 07:09:57 AM PST US From: Christopher Stone Subject: Re: RV8-List: Question On Low-Pressure Brake Lines... Matt... RV's have been using the nylon brake supply tube for years with few problems. The issue that may give you a problems is when bleeding... Being able to see the bubbles in the supply lines make it possible to purge them. I admit that I have a sample size of one... but, we had a tough time getting all the bubbles out even when we could see them. Chris Stone RV-8 Newberg, Oregon -----Original Message----- >From: Matt Dralle >Sent: Oct 28, 2008 9:48 PM >To: rv8-list@matronics.com, rv-list@matronics.com >Subject: RV8-List: Question On Low-Pressure Brake Lines... > > >Dear Listers, > >I spent a lot of time staring at those plastic brake lines for the low pressure side and just didn't like a thing about them. Just imagine if one were to break and what a mess all the brake fluid all over the cockpit would be like. > >After some thought, I came up with the following system for the low pressure feed. I used standard AN 1/4" fittings and aluminum tubing to bring the fluid from the reservoir to a tee fitting and then to bulkhead fittings that connect to standard Aeroquip hoses to the master calendars. Yeah, it was a little more weight, but the peace of mind is worth it. > >But here's my question. Notice that on the back side of the second bulkhead, I kind of looped the tubing up and around the hole for the vent. This also positioned tee fitting nicely to feed the left and right sides. The top of that loop is maybe 4 to 5" higher than the top of the reservoir, though. Is the flow from the reservoir to the master cylinders suppose to be basically "gravity fed" or is the "pump" action from the master cylinders all that is necessary to keep the tube and master cylinders full? > >Matt Dralle >RV-8 #82880 N844RV (res) ________________________________ Message 2 _____________________________________ Time: 07:56:57 AM PST US From: manuel weber Subject: Re: RV8-List: Question On Low-Pressure Brake Lines... The important thing is to have the reservoir higher than any of the feed li nes.- Having all the bubbles out of the feed lines is not necessary as lo ng as you have enough head for a positive fluid flow to the master cylinder s.- You may have a-problem with an air lock in some of the loops you cr eated in the feed lines.- -Pressure bleeding the system from the bottom up should purge enough of the feed lines to have a sufficient solid reserv oir of fluid for feeding the master cylinders when they need additional flu id.=0A=0ARemember that the only time the master cylinders need any addition al fluid is to compensate for brake wear.=0A=0A=0A=0A=0A___________________ _____________=0AFrom: Matt Dralle =0ATo: rv8-list@mat ronics.com; rv-list@matronics.com=0ASent: Tuesday, October 28, 2008 8:48:08 PM=0ASubject: RV8-List: Question On Low-Pressure Brake Lines...=0A=0A=0ADe ar Listers,=0A=0AI spent a lot of time staring at those plastic brake lines for the low pressure side and just didn't like a thing about them.- Just imagine if one were to break and what a mess all the brake fluid all over the cockpit would be like.=0A=0AAfter some thought, I came up with the foll owing system for the low pressure feed.- I used standard AN 1/4" fittings and aluminum tubing to bring the fluid from the reservoir to a tee fitting and then to bulkhead fittings that connect to standard Aeroquip hoses to t he master calendars.- Yeah, it was a little more weight, but the peace of mind is worth it.=0A=0ABut here's my question.- Notice that on the back side of the second bulkhead, I kind of looped the tubing up and around the hole for the vent.- This also positioned tee fitting nicely to feed the l eft and right sides.- The top of that loop is maybe 4 to 5" higher than t he top of the reservoir, though.- Is the flow from the reservoir to the m aster cylinders suppose to be basically "gravity fed" or is the "pump" acti on from the master cylinders all that is necessary to keep the tube and mas ter cylinders full?=0A=0AMatt Dralle=0ARV-8 #82880 N844RV (res)=0A=0A=0A ________________________________ Message 3 _____________________________________ Time: 10:03:58 AM PST US From: "James Baldwin" Subject: RE: RV8-List: Question On Low-Pressure Brake Lines... Matt- Surely you are using one of the "reverse flow", one man brake bleeding external reservoirs? With it, the external source of brake fluid is forced back through the calipers, up the pressurized supply lines, through the master cylinders, up the un-pressurized feed lines and into the reservoir, spilling out the top into a temporary catch can. There is no possible bubble in any line. Works great, available at ACS. JBB -----Original Message----- From: owner-rv8-list-server@matronics.com [mailto:owner-rv8-list-server@matronics.com] On Behalf Of Matt Dralle Sent: Tuesday, October 28, 2008 6:48 PM Subject: RV8-List: Question On Low-Pressure Brake Lines... Dear Listers, I spent a lot of time staring at those plastic brake lines for the low pressure side and just didn't like a thing about them. Just imagine if one were to break and what a mess all the brake fluid all over the cockpit would be like. After some thought, I came up with the following system for the low pressure feed. I used standard AN 1/4" fittings and aluminum tubing to bring the fluid from the reservoir to a tee fitting and then to bulkhead fittings that connect to standard Aeroquip hoses to the master calendars. Yeah, it was a little more weight, but the peace of mind is worth it. But here's my question. Notice that on the back side of the second bulkhead, I kind of looped the tubing up and around the hole for the vent. This also positioned tee fitting nicely to feed the left and right sides. The top of that loop is maybe 4 to 5" higher than the top of the reservoir, though. Is the flow from the reservoir to the master cylinders suppose to be basically "gravity fed" or is the "pump" action from the master cylinders all that is necessary to keep the tube and master cylinders full? Matt Dralle RV-8 #82880 N844RV (res) ________________________________ Message 4 _____________________________________ Time: 01:46:18 PM PST US Subject: Re: RV8-List: Question On Low-Pressure Brake Lines... From: "david wilder" Could you please delete me from the RV list? I am going in a different direction. David Wilder ----- Original Message ----- From: "Matt Dralle" Sent: Tue, October 28, 2008 21:48 Subject:RV8-List: Question On Low-Pressure Brake Lines... Dear Listers, I spent a lot of time staring at those plastic brake lines for the low pressure side and just didn't like a thing about them. Just imagine if one were to break and what a mess all the brake fluid all over the cockpit would be like. After some thought, I came up with the following system for the low pressure feed. I used standard AN 1/4" fittings and aluminum tubing to bring the fluid from the reservoir to a tee fitting and then to bulkhead fittings that connect to standard Aeroquip hoses to the master calendars. Yeah, it was a little more weight, but the peace of mind is worth it. But here's my question. Notice that on the back side of the second bulkhead, I kind of looped the tubing up and around the hole for the vent. This also positioned tee fitting nicely to feed the left and right sides. The top of that loop is maybe 4 to 5" higher than the top of the reservoir, though. Is the flow from the reservoir to the master cylinders suppose to be basically "gravity fed" or is the "pump" action from the master cylinders all that is necessary to keep the tube and master cylinders full? Matt Dralle RV-8 #82880 N844RV (res) ----- End of original message ----- ________________________________ Message 5 _____________________________________ Time: 04:32:43 PM PST US From: "William Slaughter" Subject: RE: RV8-List: Question On Low-Pressure Brake Lines... David, you have to do that yourself. Look at the instructions at the bottom of the post. -----Original Message----- From: owner-rv8-list-server@matronics.com [mailto:owner-rv8-list-server@matronics.com] On Behalf Of david wilder Sent: Wednesday, October 29, 2008 3:44 PM Subject: Re: RV8-List: Question On Low-Pressure Brake Lines... Could you please delete me from the RV list? I am going in a different direction. David Wilder ----- Original Message ----- From: "Matt Dralle" Sent: Tue, October 28, 2008 21:48 Subject:RV8-List: Question On Low-Pressure Brake Lines... Dear Listers, I spent a lot of time staring at those plastic brake lines for the low pressure side and just didn't like a thing about them. Just imagine if one were to break and what a mess all the brake fluid all over the cockpit would be like. After some thought, I came up with the following system for the low pressure feed. I used standard AN 1/4" fittings and aluminum tubing to bring the fluid from the reservoir to a tee fitting and then to bulkhead fittings that connect to standard Aeroquip hoses to the master calendars. Yeah, it was a little more weight, but the peace of mind is worth it. But here's my question. Notice that on the back side of the second bulkhead, I kind of looped the tubing up and around the hole for the vent. This also positioned tee fitting nicely to feed the left and right sides. The top of that loop is maybe 4 to 5" higher than the top of the reservoir, though. Is the flow from the reservoir to the master cylinders suppose to be basically "gravity fed" or is the "pump" action from the master cylinders all that is necessary to keep the tube and master cylinders full? Matt Dralle RV-8 #82880 N844RV (res) ----- End of original message ----- ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv8-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV8-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv8-list Browse Digests http://www.matronics.com/digest/rv8-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.