Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Brake failure

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Yak-List
View previous topic :: View next topic  
Author Message
sailor2645(at)aol.com
Guest
PostPosted: Wed Jan 13, 2016 7:32 am    Post subject: Brake failure Reply with quote
Can anyone offer advice on this issue?
I have a Yak 55M with the Cleveland brake conversion.
For the past several flights my brakes were fine for taxi out and run up but after landing and taxi back to the hangar I had difficulty holding the right brake for scavenge run up. The rotor was not any warmer than the left one.
Yesterday the right brake failed completely after landing. Coincidentally the temperature was 15* below previous flights (50*).
The reservoir is full with normal pedal travel. My aircraft manual speaks about a gauze filter in the master cylinder to preclude loss of fluid during inverted flight. Could this be blocking normal pressure equilibrium after extended inverted flight and descent to sea level?
Im guessing here cause I don't really understand how the mechanism works.
Thanks, Dan Caldwell KPGD

Sent from my iPad

- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
beach(at)digitalexp.com
Guest
PostPosted: Thu Jan 14, 2016 3:05 am    Post subject: Brake failure Reply with quote
Dan, You might check to see if any automotive-type brake was put in the system. This can ruin the seals. Only use the 5606 brake fluid. Mike Roehr

- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
Steve Geard



Joined: 09 Dec 2013
Posts: 36
PostPosted: Tue Sep 03, 2019 11:33 pm    Post subject: Re: Brake failure Reply with quote
Hey there, did you get to the bottom of your brake issues?
I have a soft pedal on my 55m and have pulled the master cylinder.
Need some rubber parts, do you know of anything available ?
Cheers Steve.

- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

_________________
SteveO
Back to top
View user's profile Send private message Send e-mail
wlannon(at)shaw.ca
Guest
PostPosted: Wed Sep 04, 2019 11:54 am    Post subject: Brake failure Reply with quote
Steve;

Are you using a red colored fluid (Aeroshell Fluid 41 or equiv.)? If so
your seals are neoprene/nitrile NOT natural rubber.

Automotive (and very old aircraft to about late 1940's) used natural rubber
seals and vegetable based brake fluid. Probably today all brake seals
should be Nitrile/Neoprene since these are compatible with both vegetable
and mineral fluids.

However, if you are about to use an automotive seal in your red fluid brake
system soak it in that fluid for at least 48 hours and ensure there has been
no change in dimensions.

Walt

--

- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
Steve Geard



Joined: 09 Dec 2013
Posts: 36
PostPosted: Sat Sep 07, 2019 11:47 pm    Post subject: Re: Brake failure Reply with quote
Thanks Walt. Yep I've had these issues with a plane in the past that used automotive master cylinder and aeromotive brakes. Had to swap out the rubbers.

Luckily most O Rings these days are Nitrile. I've soaked the parts over the weekend , and no swelling. So will reassemble with new ORings.
The rubber boots over the springs are perished, they will be a problem child to replace.

Quick question, there is a square section ORing that fits into a machined recess on the piston. It was really hard to remove, we had to pick it out bit by bit. Would appear to have been bonded in. There is a red stain on the alloy inside the recess. Is there a red locktite product that bonds Rubber to Alloy and can be used in brakefluid ?
Cheers Steve.

- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

_________________
SteveO
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Yak-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group