VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 03-03-2013, 11:41 AM
LettersFromFlyoverCountry's Avatar
LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,826
Default Brake grease?

In his excellent EAA homebuilder video on brake pads (I'm replacing mine), Dick Kohler said the two studs on which the lining plate moves should be lightly greased with a "high temperature silicon grease." I'm unfamiliar with this. Does anyone have a particular recommendation?

Also, it seems like greasing these is inviting contamination and crud to get up in there and mess up the works.
__________________
Bob Collins
St. Paul, MN.
Blog: Letters From Flyover Country
RV-12iS Powerplant kit
N612EF Builder log (EAA Builder log)
Last article: "Gonna Finish This Sucker" (Kitplanes)
Waiting for the avionics kit (backordered: chip shortage)
Reply With Quote
  #2  
Old 03-03-2013, 11:52 AM
terrye terrye is offline
 
Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 962
Default Pin Lube

I used Never-Seeze on mine. It's more likely that dirt, mud, water will get on the pins and cause them to seize than the lube get on the disc rotors and cause braking problems. Use very little. Have a look on the manufacturer's website and see if they have a maintenance manual, it should specify a lubricant product.
__________________
Terry Edwards
RV-9A (Fuselage)
2021/2022 VAF Contribution Sent
Reply With Quote
  #3  
Old 03-03-2013, 11:56 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 10,356
Default

Failure to lube caliper pins is a common cause of uneven pad wear or left/right pull when braking. The caliper must be able to slide freely. Same for any car, truck, or airplane with single-side caliper pistons.

Bob, you're right, but it's something we just live with. In the automotive world the pins get rubber seals to keep the dirt and water out. However, it's not unusual for a set of pads to go 75,000 miles these days, so nobody checks the pins very often. Ours get more regular attention.

Clean the bores and the pins with a good solvent, polish out any rust or roughness, lube lightly, and you'll be fine till next annual.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #4  
Old 03-03-2013, 12:31 PM
bruceg bruceg is offline
 
Join Date: Sep 2011
Location: AL
Posts: 69
Default

Bob, I use Permatex? Ultra Disc Brake Caliper Lube. The auto parts stores around here have it in a 10 gram package at the front counter.
__________________
Bruce G.
RV-8
Reply With Quote
  #5  
Old 03-03-2013, 03:01 PM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
Smile

Cleveland recommends the following for the anchor bolts of non-amphibious brakes -

Silicone Spray
Dri-Slide Multi-Purpose Lubricant
LPS Force 842 Dry Moly Lubricant

http://www.parker.com/literature/Air...BCMM0001-9.pdf

Just get some Silicone spray from your favorite hardware store. As mentioned earlier, you don't really want anything that remains greasy down there.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Reply With Quote
  #6  
Old 03-03-2013, 03:33 PM
ccsmith51's Avatar
ccsmith51 ccsmith51 is offline
 
Join Date: Jul 2010
Location: Orlando, FL
Posts: 1,077
Default

This is a very timely post for me. I just completed the condition inspection and replaced all brake pads. The A&P that performed the inspection suggested coating them a very light coat of lithium grease.

Now it sounds like that is not such a good idea. Should I remove them clean the pins and sockets, spray with some silicon lube, and then reassemble?

On a related issue, the left brake was leaking at the caliper disc. We changed the O-ring, using brake fluid to lube it before reinstalling the disc.

Now the left brake makes a "groaning" sound, but only when there is only a slight amount of brake pedal pressure applied. If I let off the pressure, or increase the pressure, the groan goes away. Both brakes hold well at static RPM.

Any ideas or suggestions? Thanks.
__________________
Chris Smith
Maule M5-180C (Sold)
RV-6 O-360 CS (Sold)
RV-4 O-360 FP (Sold)
Full-time in the other type of RV....
Reply With Quote
  #7  
Old 03-03-2013, 03:37 PM
Walt's Avatar
Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,348
Default

I use a dry moly spray, greases tend to collect dirt and brake dust.
__________________
Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 2000+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Reply With Quote
  #8  
Old 03-03-2013, 03:54 PM
ccsmith51's Avatar
ccsmith51 ccsmith51 is offline
 
Join Date: Jul 2010
Location: Orlando, FL
Posts: 1,077
Default

Thanks, Walt, can I get that at an auto parts store? If so I will pull the pants and brakes this weekend and clean and re-lube and reinstall.

Any ideas on the groaning noise? I can hear it in the cockpit with my ANR on. I'm trying to recall if I can feel any vibration, and if I can, it is very slight, mainly just noise. Kind of like a dry pad on a dry disc...
__________________
Chris Smith
Maule M5-180C (Sold)
RV-6 O-360 CS (Sold)
RV-4 O-360 FP (Sold)
Full-time in the other type of RV....
Reply With Quote
  #9  
Old 03-03-2013, 08:05 PM
Walt's Avatar
Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,348
Default

Quote:
Originally Posted by ccsmith51 View Post
Thanks, Walt, can I get that at an auto parts store? If so I will pull the pants and brakes this weekend and clean and re-lube and reinstall.

Any ideas on the groaning noise? I can hear it in the cockpit with my ANR on. I'm trying to recall if I can feel any vibration, and if I can, it is very slight, mainly just noise. Kind of like a dry pad on a dry disc...
Most places sell some kind of dry moly lube, I've used Hopps dry lube (gun stores) and Dri-slide from the bike store and probably a few others over the years.

"Groaning" is caused by vibration and is usually from worn or contaminated pads. If you get grease of 5606 on the pads or disc and fail to clean it off you can ruin the pads.
__________________
Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 2000+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Reply With Quote
  #10  
Old 03-03-2013, 08:22 PM
ccsmith51's Avatar
ccsmith51 ccsmith51 is offline
 
Join Date: Jul 2010
Location: Orlando, FL
Posts: 1,077
Default

OK, thanks, I'll pull everything apart and clean this weekend.
__________________
Chris Smith
Maule M5-180C (Sold)
RV-6 O-360 CS (Sold)
RV-4 O-360 FP (Sold)
Full-time in the other type of RV....
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 02:06 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.