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schmoboy
Joined: 26 Feb 2006
Posts: 130
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 Posted: Fri Oct 10, 2014 7:43 am Post subject: Knock When Releasing Brake |
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When I release the brakes, the right main caliper "knocks". I can make
it happen all the time when in the hangar and just pressing and
releasing the right brake. It just started happening and can't track it
down. The brakes are stiff, so I don't think it's a bleed issue.
Anyone seen this happen?
Thanks,
-Sean #40303
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davidsoutpost(at)comcast.
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| Posted: Fri Oct 10, 2014 8:33 am Post subject: Knock When Releasing Brake |
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My right brake was doing this on occasion also. Yesterday during pre-flight I found a small puddle of brake fluid under the caliper. The pads on that side were well worn unevenly and the came from the caliper piston which was fully extended. The caliper paint itself was a slight shade darker than the left so it must have been hanging up and dragging. The backing plate guide pins had some rough areas too. New parts are on order and I will do both sides of course.
David Clifford
From: "Sean Stephens" <sean(at)stephensville.com>
To: rv10-list(at)matronics.com
Sent: Friday, October 10, 2014 11:43:07 AM
Subject: RV10-List: Knock When Releasing Brake
--> RV10-List message posted by: Sean Stephens <sean(at)stephensville.com>
When I release the brakes, the right main caliper "knocks". I can make
it happen all the time when in the hangar and just pressing and
releasing the right brake. It just started happening and can't track it
down. The brakes are stiff, so I don't think it's a bleed issue.
Anyone seen this happen?
Thanks,
[quote][b]
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carl.froehlich(at)verizon
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| Posted: Fri Oct 10, 2014 8:59 am Post subject: Knock When Releasing Brake |
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I had a rolled caliper piston O ring on the left side at ~100 hours. I also found this on a pre-flight – noting unusual wear on the left tire (photo attached). Pulling the wheel pant I found the brake pad to be essential gone. Pulling the caliper off the piston popped out on its own. My guess on what happened was the rolled O ring caused the piston to remained extended enough with no brakes applied to drag the tire on take offs and landings to cause the wear. I estimate this all happened in ~20 hours of service.
Replaced O rings, pads and tires on both sides. Last 100 hours have been trouble free.
Carl
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of David Clifford
Sent: Friday, October 10, 2014 12:33 PM
To: rv10-list(at)matronics.com
Subject: Re: Knock When Releasing Brake
My right brake was doing this on occasion also. Yesterday during pre-flight I found a small puddle of brake fluid under the caliper. The pads on that side were well worn unevenly and the came from the caliper piston which was fully extended. The caliper paint itself was a slight shade darker than the left so it must have been hanging up and dragging. The backing plate guide pins had some rough areas too. New parts are on order and I will do both sides of course.
David Clifford
From: "Sean Stephens" <sean(at)stephensville.com (sean(at)stephensville.com)>
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Friday, October 10, 2014 11:43:07 AM
Subject: Knock When Releasing Brake
--> RV10-List message posted by: Sean Stephens <sean(at)stephensville.com (sean(at)stephensville.com)>
When I release the brakes, the right main caliper "knocks". I can make
it happen all the time when in the hangar and just pressing and
releasing the right brake. It just started happening and can't track it
down. The brakes are stiff, so I don't think it's a bleed issue.
Anyone seen this happen?
Thanks,
| Quote: | | http://www.matronics.com/Navigator?RV10-List |
01234567
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Lew Gallagher
Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC
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| Posted: Fri Oct 10, 2014 9:43 am Post subject: Knock When Releasing Brake |
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Hey Sean,
Just a reminder about the issue of sometimes the pedal itself doesn't
completely release. There is a release passage at the very bottom of the
master cylinder on the pedal that keeps pressure on the line if the pedal
doesn't retract fully. I actually rigged up springs to help the pedals
retract until someone pointed out that the spring in the cylinder is
adequate for the job IF there is no binding in the hinge rod through the
bottom of the pedal. Making sure that the holes for that rod are drilled
straight is a much easier fix. That may not be your problem, but may be
worth checking out.
Later, - Lew
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_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed ! |
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taildragon(at)msn.com
Guest
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| Posted: Fri Oct 10, 2014 6:22 pm Post subject: Knock When Releasing Brake |
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This thread reminds me that I never explained how I resolved the "gear leg shake"
issue. No one has mentioned it for a long time. Problem solved?
Roger
#40291
| Quote: | From: lewgall(at)charter.net
To: rv10-list(at)matronics.com
Subject: Re: Knock When Releasing Brake
Date: Fri, 10 Oct 2014 13:42:24 -0400
--> RV10-List message posted by: <lewgall(at)charter.net>
Hey Sean,
Just a reminder about the issue of sometimes the pedal itself doesn't
completely release. There is a release passage at the very bottom of the
master cylinder on the pedal that keeps pressure on the line if the pedal
doesn't retract fully. I actually rigged up springs to help the pedals
retract until someone pointed out that the spring in the cylinder is
adequate for the job IF there is no binding in the hinge rod through the
bottom of the pedal. Making sure that the holes for that rod are drilled
straight is a much easier fix. That may not be your problem, but may be
worth checking out.
Later, - Lew
_-============================
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http://www.matronics.com/Navigator?RV10-List |
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rv10flyer(at)live.com
Guest
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| Posted: Fri Oct 10, 2014 7:14 pm Post subject: Knock When Releasing Brake |
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“This thread reminds me that I never explained how I resolved the "gear leg shake"”
so how did you?
I saw that there was a wedge of wood placed on the back of the leg that was meant to dampen the leg shake. I randomly get it on landings, so haven’t pursue doing it myself.
From: Roger Standley (taildragon(at)msn.com)
Sent: Friday, October 10, 2014 7:21 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: RE: Knock When Releasing Brake
This thread reminds me that I never explained how I resolved the "gear leg shake"
issue. No one has mentioned it for a long time. Problem solved?
Roger
#40291
> From: lewgall(at)charter.net
| Quote: | To: rv10-list(at)matronics.com
Subject: Re: Knock When Releasing Brake
Date: Fri, 10 Oct 2014 13:42:24 -0400
--> RV10-List message posted by: <lewgall(at)charter.net>
Hey Sean,
Just a reminder about the issue of sometimes the pedal itself doesn't
completely release. There is a release passage at the very bottom of the
master cylinder on the pedal that keeps pressure on the line if the pedal
doesn't retract fully. I actually rigged up springs to help the pedals
retract until someone pointed out that the spring in the cylinder is
adequate for the job IF there is no binding in the hinge rod through the
bottom of the pedal. Making sure that the holes for that rod are drilled
straight is a much easier fix. That may not be your problem, but may be
worth checking out.
Later, - Lew
====
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