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Lew Gallagher
Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC
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 Posted: Sat Mar 27, 2010 6:20 pm Post subject: Sticking new brakes |
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Oh yeah, here's another one.
We've had trouble with the brakes locking up during the break in taxiing phase. First we thought it was the protective coat on the rotors gumming up everything, so I cleaned it all off. Still locked up.
We were on the verge of following another's advice to replace the seals in the calipers ("if they sit too long on the shelf, they can harden and not allow the pistons to recede"). Then I remembered a post here long ago about the spring not being strong enough in the pedal pistons to retract the pedal. I think they added washers under the cir-clip to increase the spring tension -- that seemed to me like the piston would still "think" it wasn't fully retracted. At any rate, I checked, and sure enough -- on the pilot's side both pedals could be manually retracted about 1/4 inch(measured at the top of the brake pedal) -- and that slight difference freed up the calipers (since they were off the ground with our new wing jacks, easy to test!).
The quickest solution I came up with was to adapt a spring for each pedal (the co-pilot's side retract just fine) on the pilot's side. This spring attaches to the back side of the pedal hinge connection, wraps around the bottom of the rudder pedal (cushioned by a short length of vinyl tubing around the spring), and attaches to the front side of the piston/pedal connection. It pulls the pedal back every time, non-obtrusive, no more dragging brakes!
It works for now. Others had this problem and found a better solution? Maybe new pedal pistons? Stronger internal springs? Maybe will "wear in" and loosen with time?
I can take pictures if there's any interest.
Later, - Lew
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non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
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Phil.Perry(at)netapp.com
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| Posted: Sat Mar 27, 2010 6:34 pm Post subject: Sticking new brakes |
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You might try backing off the castle nut one flat. That might free up the piston so it won't bind.
Phil
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dlm46007(at)cox.net
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| Posted: Sat Mar 27, 2010 7:13 pm Post subject: Sticking new brakes |
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excellent idea. a loosening of the bolt holding the MATCO brake cylinder cured my occasional dragging brake problem. It is comforting to know that even a slight drag can be over come with power. last year at OSH I noticed a slight drag while taxing for takeoff. I had an IFR out directly after the air show. since the flagman pulled out IFR traffic for their reservation departure, although, I noticed a drag, I was cleared around about 15 other aircraft so I just pushed the throttle forward and lifted off.
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Perry, Phil
Sent: Saturday, March 27, 2010 7:34 PM
To: rv10-list(at)matronics.com
Subject: Re: Sticking new brakes
You might try backing off the castle nut one flat. That might free up the piston so it won't bind.
Phil
----- Original Message -----
From: Lew Gallagher <lewgall(at)charter.net>
To: rv10-list(at)matronics.com <rv10-list(at)matronics.com>
Sent: Sat Mar 27 19:20:50 2010
Subject: Sticking new brakes
--> RV10-List message posted by: "Lew Gallagher" <lewgall(at)charter.net>
Oh yeah, here's another one.
We've had trouble with the brakes locking up during the break in taxiing phase. First we thought it was the protective coat on the rotors gumming up everything, so I cleaned it all off. Still locked up.
We were on the verge of following another's advice to replace the seals in the calipers ("if they sit too long on the shelf, they can harden and not allow the pistons to recede"). Then I remembered a post here long ago about the spring not being strong enough in the pedal pistons to retract the pedal. I think they added washers under the cir-clip to increase the spring tension -- that seemed to me like the piston would still "think" it wasn't fully retracted. At any rate, I checked, and sure enough -- on the pilot's side both pedals could be manually retracted about 1/4 inch(measured at the top of the brake pedal) -- and that slight difference freed up the calipers (since they were off the ground with our new wing jacks, easy to test!).
The quickest solution I came up with was to adapt a spring for each pedal (the co-pilot's side retract just fine) on the pilot's side. This spring attaches to the back side of the pedal hinge connection, wraps around the bottom of the rudder pedal (cushioned by a short length of vinyl tubing around the spring), and attaches to the front side of the piston/pedal connection. It pulls the pedal back every time, non-obtrusive, no more dragging brakes!
It works for now. Others had this problem and found a better solution? Maybe new pedal pistons? Stronger internal springs? Maybe will "wear in" and loosen with time?
I can take pictures if there's any interest.
Later, - Lew
--------
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Avionics in, engine started!
Read this topic online here:
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