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 07-05-2019, 05:40 PM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 581
Default More brake woes

I?m on a big cross county trip, visiting family in Summerside, PEI, 2400 NM from home. It?s been a good trip,, RVs are a great way to travel. I had 3 weather related diversions, but never got into much trouble. My first day last Saturday had me lose all of my brake fluid on the right side after landing. This was resolved after we found a broken flare in the top of leg fitting. Brakes worked great until yesterday. After a couple of short flights here I noticed my right brake was gone on rollout. After a half dozen left hand pirouettes for my right exit I had to shut down to stop turning. Got a tow back to the hangar and got a look today. I set out to bleed the brake and quickly discovered when my son pressed on the brake that fluid was coming out around the piston. No standing leak, but I had lost some fluid earlier at the end of the runway.

We removed the calliper and I got the piston out. There were no signs of any problems, not in the calliper, nor the piston or o-ring. Everything was nice and smooth. We?ll reinstall it tomorrow and check agin, just in case there was something contaminating the seal. I am not optimistic, I have always had problems with this brake leaking occasionally. I suspect there may be a non-visible defect in the assembly. Anyone else see this?

I?ve got Marco callipers, and less than 100 hours on them.
__________________
Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
Reply With Quote
  #2  
Old 07-05-2019, 06:25 PM
RV8RIVETER's Avatar
RV8RIVETER RV8RIVETER is offline
 
Join Date: Sep 2005
Location: 1T7, Kestrel Airpark , Texas
Posts: 780
Default

Had nothing but problems with my Matco masters. We bled the brakes what seemed like 5 times a year, then we had leaking out the shaft. Rebuilt and polished shaft but still no good.

We just recently put in Grove masters with built in reservoir. Wow, what a difference. Adjustable throw so we could pitch the pedal back a bit, more brake power, feel better than old ones ever did.
__________________
Wade Lively
-8, Flying!
N100WL
formerly IO-360A3B6D, Dual SDS CPI now, WW 200RV
Reply With Quote
  #3  
Old 07-05-2019, 10:23 PM
Tracer 10 Tracer 10 is offline
 
Join Date: Mar 2011
Location: Oregon
Posts: 152
Default Marco Brake Calipers

Quote:
Originally Posted by Flying Canuck View Post
I?m on a big cross county trip, visiting family in Summerside, PEI, 2400 NM from home. It?s been a good trip,, RVs are a great way to travel. I had 3 weather related diversions, but never got into much trouble. My first day last Saturday had me lose all of my brake fluid on the right side after landing. This was resolved after we found a broken flare in the top of leg fitting. Brakes worked great until yesterday. After a couple of short flights here I noticed my right brake was gone on rollout. After a half dozen left hand pirouettes for my right exit I had to shut down to stop turning. Got a tow back to the hangar and got a look today. I set out to bleed the brake and quickly discovered when my son pressed on the brake that fluid was coming out around the piston. No standing leak, but I had lost some fluid earlier at the end of the runway.

We removed the calliper and I got the piston out. There were no signs of any problems, not in the calliper, nor the piston or o-ring. Everything was nice and smooth. We?ll reinstall it tomorrow and check agin, just in case there was something contaminating the seal. I am not optimistic, I have always had problems with this brake leaking occasionally. I suspect there may be a non-visible defect in the assembly. Anyone else see this?

I?ve got Marco callipers, and less than 100 hours on them.
Is their a chance the pistons were installed backwards when last assembled into the calipers? The O-Ring end of the piston must be installed first into the caliper.
__________________
CW4 (Retired) U.S. Army
A&P: I pay double dues (it's worth it)
Restored L2-M; flown 7 years & sold.
Flying Oregon RV-6
Reply With Quote
  #4  
Old 07-05-2019, 10:35 PM
Alchemist Alchemist is offline
 
Join Date: Mar 2014
Location: Glasgow, KY
Posts: 173
Default

Had same problem, the oring was installed wrong. Make sure it goes in first.
Reply With Quote
  #5  
Old 07-05-2019, 11:52 PM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,581
Default

Glad to see you are getting lots of usage of your 9.
Caliper orings can loose their seal as they stiffen up & loose their round shape in the bore. Best to replace it if you already have it apart. O ring is same as used on a number of certified a/c so maybe the local mechanic has one.
__________________
Ralph
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more

Last edited by Ralph Inkster : 07-05-2019 at 11:55 PM.
Reply With Quote
  #6  
Old 07-06-2019, 06:09 AM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 581
Default

The o-ring in this calliper is in the bore, not the piston. There is no perceptible direction for the piston, it?s just a straight cylinder. I?ve reinstalled it in the same orientation as original based on the slight wear on the face. The o-ring is embedded in the bore wall and has a flat inside surface that is flush with the wall. There are no aviation mechanics at this field.

I?ll test it out today now that it?s reassembled. Maybe I can find an AME in Charlottetown with an o-ring. Otherwise, if it still doesn?t seal, I?ll have to order something on Monday for overnight delivery. I need to be on my way home by Wednesday or Thursday latest.
__________________
Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
Reply With Quote
  #7  
Old 07-06-2019, 07:08 AM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 581
Default

And now that I think about it, the M3-222 Buna-n o-ring seems to be the correct one for my calliper (PH-1A). This is a round cross section ring, I sure shouldn?t be seeing it flat and flush with the bore wall. I?ll try to find a suitable o-ring and replace it.
__________________
Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
Reply With Quote
  #8  
Old 07-06-2019, 07:48 AM
skyking902001's Avatar
skyking902001 skyking902001 is offline
 
Join Date: Oct 2009
Location: Gunter, TX
Posts: 337
Default O-rings

I have had several leaks at the brake cylinders (both sides). I finally replaced the factory O-rings (Buna) with Viton rings and so far no more leaks. My -8 has Matco brakes PH-1A. The calipers came with Buna rings-part number MSC2-222. The Viton part number is 222VBN. Buna rings are black, Viton rings are brown. I got them from Oringsandmore. Hope you get the issue resolved--I hate dealing with leaky brakes!
__________________
Steve Riffe
RV-8
N23SR
Dues paid to 12-1-21
www.mykitlog.com/skyking90200

Last edited by skyking902001 : 07-06-2019 at 09:03 AM. Reason: clarify
Reply With Quote
  #9  
Old 07-06-2019, 10:50 AM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 581
Default

I finally found an o-ring locally. It's a perfect fit but it probably isn't the exact part. There's no question that the original ring is deformed. I'll reassemble this afternoon and see how it seals. I ordered a couple of sets of the Viton rings that I'm getting shipped to my home, I'll replace both sides when I'm home. I'm also going to try to get myself setup for a field repair before I depart homeward. Getting the tire off will be the tricky part. I didn't bring my jack setup. If nothing else, my travel kit planning will be much better for future trips.
__________________
Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
Reply With Quote
  #10  
Old 07-06-2019, 02:48 PM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 581
Default

New o-ring is holding flawlessly. Took quite a while to bleed the brake and I've still got a soft right side pedal. The pilot pedal is solid. Suggests to me some air is trapped between the pedals, we'll go out tomorrow and try to get that out. The brake works now, all I'd like now is some confidence that the air in between the pedals isn't going to migrate past the pilot pedal and cost me my brakes again.

This is time confusing, tedious and frustrating stuff. I'm just glad my brake problems didn't show when I went through Burlington, VT - an airport that surprised me at how busy it was.
__________________
Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
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 03:07 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.