Original Posted By: Waytogopiet(at)aol.com
Subject: Pietenpol-List: brake jobIt's been so slow on the list lately that I thought I'd go ahead and post some info on my brakes. As I mentioned, they are off a Cessna 172 and had life left on the linings, but one of the linings cracked somewhere along the line so I decided to proceed with replacement. There are two tools available to remove the old rivets and set new ones... a hammer-powered one and one with a screw press. Our EAA Chapter 35 happened to have the hammer-driven one in its tool chest so I used that one.It went very quickly and easily. One punch drives out the old rivets to release the worn linings, then a different punch and set are used to head the hollow end and back up the rivet head inside the pocket in the brake lining. Very painless. One little improvement with these new Rapco linings is that they are now made with a wear indicator... a simple notch in one edge of the lining, approximately half the depth of the lining. When it's worn down to where you can't see the notch anymore, you should be thinking about replacing the linings.According to the Rapco website and instructions, break-in of the new linings consists of a moderate taxi and application of brakes (there will be very little braking action at first), followed by a cool-down and another moderate taxi with braking. I will try this taxi testing and brake lining break-in soon.Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________
Pietenpol-List: brake job
Re: Pietenpol-List: brake job
Original Posted By: "Graham and Robyn"
Subject: Re: Pietenpol-List: brake jobOscar,When I changed brake linings on the Taylorcraft my IA told me to taxi and drag the brakes. At about 1/2 way to the end of the runway the brakes were pretty well locked up and I was having problems moving. I turned around and let things cool down and they have been happy ever since.DaveN36078 '41 BC-12-65At 11:15 AM 7/19/2006, Oscar Zuniga wrote:>>It's been so slow on the list lately that I thought I'd go ahead and post >some info on my brakes. As I mentioned, they are off a Cessna 172 and had >life left on the linings, but one of the linings cracked somewhere along >the line so I decided to proceed with replacement. There are two tools >available to remove the old rivets and set new ones... a hammer-powered >one and one with a screw press. Our EAA Chapter 35 happened to have the >hammer-driven one in its tool chest so I used that one.>>It went very quickly and easily. One punch drives out the old rivets to >release the worn linings, then a different punch and set are used to head >the hollow end and back up the rivet head inside the pocket in the brake >lining. Very painless. One little improvement with these new Rapco >linings is that they are now made with a wear indicator... a simple notch >in one edge of the lining, approximately half the depth of the >lining. When it's worn down to where you can't see the notch anymore, you >should be thinking about replacing the linings.>>According to the Rapco website and instructions, break-in of the new >linings consists of a moderate taxi and application of brakes (there will >be very little braking action at first), followed by a cool-down and >another moderate taxi with braking. I will try this taxi testing and >brake lining break-in soon.>>Oscar Zuniga>San Antonio, TX>mailto: taildrags(at)hotmail.com>website at http://www.flysquirrel.net>>>-->>>-- incoming mail is certified Virus Free.>Checked by AVG Anti-Virus.________________________________________________________________________________
Subject: Re: Pietenpol-List: brake jobOscar,When I changed brake linings on the Taylorcraft my IA told me to taxi and drag the brakes. At about 1/2 way to the end of the runway the brakes were pretty well locked up and I was having problems moving. I turned around and let things cool down and they have been happy ever since.DaveN36078 '41 BC-12-65At 11:15 AM 7/19/2006, Oscar Zuniga wrote:>>It's been so slow on the list lately that I thought I'd go ahead and post >some info on my brakes. As I mentioned, they are off a Cessna 172 and had >life left on the linings, but one of the linings cracked somewhere along >the line so I decided to proceed with replacement. There are two tools >available to remove the old rivets and set new ones... a hammer-powered >one and one with a screw press. Our EAA Chapter 35 happened to have the >hammer-driven one in its tool chest so I used that one.>>It went very quickly and easily. One punch drives out the old rivets to >release the worn linings, then a different punch and set are used to head >the hollow end and back up the rivet head inside the pocket in the brake >lining. Very painless. One little improvement with these new Rapco >linings is that they are now made with a wear indicator... a simple notch >in one edge of the lining, approximately half the depth of the >lining. When it's worn down to where you can't see the notch anymore, you >should be thinking about replacing the linings.>>According to the Rapco website and instructions, break-in of the new >linings consists of a moderate taxi and application of brakes (there will >be very little braking action at first), followed by a cool-down and >another moderate taxi with braking. I will try this taxi testing and >brake lining break-in soon.>>Oscar Zuniga>San Antonio, TX>mailto: taildrags(at)hotmail.com>website at http://www.flysquirrel.net>>>-->>>-- incoming mail is certified Virus Free.>Checked by AVG Anti-Virus.________________________________________________________________________________
Pietenpol-List: brake job
Original Posted By: "Phillips, Jack"
Subject: Pietenpol-List: brake jobDave wrote->my IA told me to taxi and drag the brakes. At about 1/2 way to the end>of the runway the brakes were pretty well locked up.>I turned around and let things cool down and they have been happy ever >since.According to the literature, for organic linings they need to get up into the 850F range but if you heat them too much too fast, you carburize the material and it becomes brittle. The heat is required to set the resins that bind the lining material and you want to form a bit of a glaze, but again- too much, too fast is not good. That's why they say to taxi about 1000 ft. to get them hot, then let them cool down, then repeat until braking action is good. The recommendation is to let them cool for 30-45 minutes between runs but I'm worried that if I do that, the brakes might get HOTTER from standing in the South Texas heat! ;o)Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________
Subject: Pietenpol-List: brake jobDave wrote->my IA told me to taxi and drag the brakes. At about 1/2 way to the end>of the runway the brakes were pretty well locked up.>I turned around and let things cool down and they have been happy ever >since.According to the literature, for organic linings they need to get up into the 850F range but if you heat them too much too fast, you carburize the material and it becomes brittle. The heat is required to set the resins that bind the lining material and you want to form a bit of a glaze, but again- too much, too fast is not good. That's why they say to taxi about 1000 ft. to get them hot, then let them cool down, then repeat until braking action is good. The recommendation is to let them cool for 30-45 minutes between runs but I'm worried that if I do that, the brakes might get HOTTER from standing in the South Texas heat! ;o)Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________
RE: Pietenpol-List: brake job
Original Posted By: "Robert Gow"
Subject: RE: Pietenpol-List: brake jobTony Bingelis describes how to condition new brake pads. I think it isin the yellow book. Here is an excerpt: "The Product Reference Memo I received with my new Cleveland wheels andbrakes states that the "conditioning" may be accomplished as follows:"1. Perform a minimum of six light pedal effort braking applicationsfrom 25 to 40 mph. Allow the brake discs to partially cool betweenstops."That's it. Apparently the procedure insures that sufficient heat isgenerated to cure the resins in the linings and yet not cause them tobecome carburized due to excessive heat.Jack Phillips-----Original Message-----[mailto:owner-pietenpol-list-server(at)matronics.com] On Behalf Of OscarZunigaSent: Thursday, July 20, 2006 8:37 AMDave wrote->my IA told me to taxi and drag the brakes. At about 1/2 way to the end>of the runway the brakes were pretty well locked up.>I turned around and let things cool down and they have been happy ever >since.According to the literature, for organic linings they need to get upinto the 850F range but if you heat them too much too fast, you carburize thematerial and it becomes brittle. The heat is required to set the resinsthat bind the lining material and you want to form a bit of a glaze, butagain- too much, too fast is not good. That's why they say to taxiabout 1000 ft. to get them hot, then let them cool down, then repeat untilbraking action is good. The recommendation is to let them cool for 30-45minutes between runs but I'm worried that if I do that, the brakes might getHOTTER from standing in the South Texas heat! ;o)Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net_________________________________________________________________________________________________________________________________
Subject: RE: Pietenpol-List: brake jobTony Bingelis describes how to condition new brake pads. I think it isin the yellow book. Here is an excerpt: "The Product Reference Memo I received with my new Cleveland wheels andbrakes states that the "conditioning" may be accomplished as follows:"1. Perform a minimum of six light pedal effort braking applicationsfrom 25 to 40 mph. Allow the brake discs to partially cool betweenstops."That's it. Apparently the procedure insures that sufficient heat isgenerated to cure the resins in the linings and yet not cause them tobecome carburized due to excessive heat.Jack Phillips-----Original Message-----[mailto:owner-pietenpol-list-server(at)matronics.com] On Behalf Of OscarZunigaSent: Thursday, July 20, 2006 8:37 AMDave wrote->my IA told me to taxi and drag the brakes. At about 1/2 way to the end>of the runway the brakes were pretty well locked up.>I turned around and let things cool down and they have been happy ever >since.According to the literature, for organic linings they need to get upinto the 850F range but if you heat them too much too fast, you carburize thematerial and it becomes brittle. The heat is required to set the resinsthat bind the lining material and you want to form a bit of a glaze, butagain- too much, too fast is not good. That's why they say to taxiabout 1000 ft. to get them hot, then let them cool down, then repeat untilbraking action is good. The recommendation is to let them cool for 30-45minutes between runs but I'm worried that if I do that, the brakes might getHOTTER from standing in the South Texas heat! ;o)Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net_________________________________________________________________________________________________________________________________