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  #1  
Old 08-03-2017, 09:07 AM
JimMac JimMac is offline
 
Join Date: Jun 2012
Location: Madison, AL
Posts: 61
Question Gear leg braided brake line

The braided brake line on my RV-12 seems very tight where it has to bend a little to connect to the caliper fitting. The brake line is so stiff and wedged in so tight between the trailing edge of the gear leg and the caliper fitting that it seems that it would impede the caliper from moving on the pins. Has anyone else had any problem with this? I have had to replace my worn-down brake shoes after only 82 hours of use. My right brake pad was dragging and always trying to turn right (at about the 70 hour point). Would it cause harm if I tried to put a permanent bend in the brake line just above the fitting that attaches to the caliper to relieve the "wedged-in" effect?
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RV-12 N864RV 90 hrs TT

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Last edited by JimMac : 08-03-2017 at 09:08 AM. Reason: removed an extra "the"
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  #2  
Old 08-03-2017, 10:08 AM
DHeal DHeal is offline
 
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Location: Windsor, California
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Be sure that there is no physical interference between the aft end of the inboard wheel pant attachment bracket and the aft-inboard corner of the brake caliper. If there is such interference, the brake caliper/linings may not wear evenly.

Also, be sure that your caliper guide pins are clean and free to move (albeit somewhat stiffly). MATCO suggests that no lubricant be used on these pins to avoid attracting grit. I typically clean the pins and sparingly apply a touch of "dry" lubricant (e.g., Boeshield, graphite, silicone, etc.).
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  #3  
Old 08-03-2017, 10:36 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by JimMac View Post
The braided brake line on my RV-12 seems very tight where it has to bend a little to connect to the caliper fitting. The brake line is so stiff and wedged in so tight between the trailing edge of the gear leg and the caliper fitting that it seems that it would impede the caliper from moving on the pins. Has anyone else had any problem with this? I have had to replace my worn-down brake shoes after only 82 hours of use. My right brake pad was dragging and always trying to turn right (at about the 70 hour point). Would it cause harm if I tried to put a permanent bend in the brake line just above the fitting that attaches to the caliper to relieve the "wedged-in" effect?
Wont help resolve your problem but just a general comment...

A standard build RV-12 doesn't have braided hose brake lines.
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  #4  
Old 08-03-2017, 11:43 AM
TS Flightlines TS Flightlines is offline
 
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Location: Ridgeland, SC
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Jim do you have sufficient slack in the hose at the caliper for the caliper to move freely?
Tom
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  #5  
Old 08-03-2017, 11:55 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Also, do not install gear leg bottom tie-wrap too close to the caliper. Bottom of braided hose needs to float. I'll take photo of my installation next time I fly.
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Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2004
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 392

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Special Thanks to EJ Trucks
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  #6  
Old 08-03-2017, 01:27 PM
JimMac JimMac is offline
 
Join Date: Jun 2012
Location: Madison, AL
Posts: 61
Default Gear leg braided brake line

Thanks for the responses, David, There is no interference between the wheel pant attach bracket and the caliper. Scott, I realize the standard RV-12 has the aluminum tube with the loop, but the builder of this plane (who I bought it from) had put these lines from TS-FlightLines on. These look like high quality lines but I may fabricate the aluminum lines with the loop and put those on. Jim S., I would be interested in seeing a photo of yours. Like I said in my initial post, The problem seems to be in how the tube was wedged between the trailing flat surface of the gear leg and the caliper attachment. The brake line is simply not going to be allowed to move as the caliper tries to move. Tom from TS FlightLines, No, there doesn't seem to be enough slack. It seems like this braided brake line might work better if it made a loop around the gear like the original design so that it would exert no resistence to the caliper movement. Well, I think I'll put the aluminum lines on as per the original design.
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Madison, AL
RV-12 N864RV 90 hrs TT

Donation Made for 2018
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  #7  
Old 08-03-2017, 02:03 PM
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Piper J3 Piper J3 is offline
 
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I will send pic next time I'm at the plane. Mine pretty much looks like the photos in the installation instructions here http://www.aircraftspecialty.com/PDF...201-4-2014.pdf
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Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2004
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 392

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
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