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llemay1(at)austin.rr.com
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 Posted: Sun May 28, 2006 3:14 pm Post subject: BRAKES |
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Problem: Have a nice RV-7 whose brakes heat up on landing with a no =
brake rollout and braking used only to stop at the hangar. Very hard to =
move by pulling on the prop on level ground for about 10 minutes. Then =
all is well and it rolls freely. Have 88 hours on the airplane and =
brake pads show no abnormal wear. Any suggestions?? =20
llemay1(at)austin.rr.com
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lifeofreiley2003(at)yahoo
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| Posted: Sun May 28, 2006 5:32 pm Post subject: BRAKES |
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Sounds like you might have some air in the brake lines. Try and bleed them and you want to do this from the bottom up.
Darrell
lowell lemay <llemay1(at)austin.rr.com> wrote:
Problem: Have a nice RV-7 whose brakes heat up on landing with a no =
brake rollout and braking used only to stop at the hangar. Very hard to =
move by pulling on the prop on level ground for about 10 minutes. Then =
all is well and it rolls freely. Have 88 hours on the airplane and =
brake pads show no abnormal wear. Any suggestions?? =20
llemay1(at)austin.rr.com
---------------------------------
Sneak preview the all-new Yahoo.com. It's not radically different. Just radically better.
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dan(at)rvproject.com
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| Posted: Sun May 28, 2006 6:12 pm Post subject: BRAKES |
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Idea #1 -- may have to add a "return spring" on your master cylinders.
Wonder if there's not enough springback built into the master cylinder.
Heard of that in a few cases, solved with a return spring. Get down in
there by the pedals, push 'em, and see if you need to pull them back for the
master cylinder pushrod to come back out, or if they stay "stuck in."
Both sides or just one side? If it's both sides, I'd be inclined to say
it's gotta be the springback thing.
Idea #2 -- could be gunk between the piston & caliper? If the pedals and
master cylinder pushrods are springing back just fine, then I'd drain the
fluid from the brakes and remove the pistons from the calipers. Could be
that there's some crud in there causing the piston to stick. Probably not,
but worth checking if nothing else pans out.
Just a couple of guesses. Best of luck. See you up at SQI & OSH for
formation?
)_( Dan
RV-7 N714D (920 hours)
http://www.rvproject.com
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RVer273sb(at)aol.com
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| Posted: Sun May 28, 2006 6:56 pm Post subject: BRAKES |
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They are supposed to run at 0 clearance.
Perhaps the linings are a little thicker than
usual. It's not uncommon to add shims between
the anvil and the puck housing. As linings wear
you can remove the shims.
Stewart RV-4
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dsvs(at)comcast.net
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| Posted: Sun May 28, 2006 10:01 pm Post subject: BRAKES |
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One other possiblity. The bolts that the brake patals pivot on may be to
tight. I know of at least one person who had this problem. They need to be
rather loose, that is why they are locked with cotter pins. Don
--
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cubflyr(at)comcast.net
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| Posted: Mon May 29, 2006 6:06 am Post subject: Brakes |
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Is this airplane new to you? There is an ancient issue with "old" return
springs on the master cylinders. The "old" ones were too short and new
replacements were sent to you from Van's for free. Was this done? It may be
in the log books but probably not. Search the archives. There are certain
lengths the correct and incorrect springs are. This measurement can be done
with the springs in place, as I recall. Having brakes that work is a nice
thing.
Michael
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charlieray(at)optonline.n
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| Posted: Mon May 29, 2006 7:09 am Post subject: BRAKES |
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Check a few things here.
bleed the system up from the bottom.
take brakes off the mount and see if the way your hose or line runs to the
caliper causes it to jam sideways in the slide pins. (loosen line and
tighten it so there is no sideload when you slide the caliper in the
mounting holes.)
polish slide pins with scotchbrite.
These are parker brakes right?
we havent even gotten to the fuselage yet, but im a mechanic.
Charles
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lifeofreiley2003(at)yahoo
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| Posted: Mon May 29, 2006 7:58 am Post subject: BRAKES |
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Charles,
I had forgotten about this issue of the caliper binding on the slide pins due to the brake fluid line side-load pressure. I had that happen on an RV7A about 9 months ago. The brakes did heat up a little from this condition while in taxi mode. I believe we were dealing with the left brake. A quick dis-assembly, cleanup and reassembly with a very light film of brake caliper pin grease and we were done. We did go ahead and bleed both brakes at the same time since we had a little grime on our hands.
Darrell
Charles Reiche <charlieray(at)optonline.net> wrote:
Check a few things here.
bleed the system up from the bottom.
take brakes off the mount and see if the way your hose or line runs to the
caliper causes it to jam sideways in the slide pins. (loosen line and
tighten it so there is no side-load when you slide the caliper in the
mounting holes.)
polish slide pins with scotchbrite.
These are parker brakes right?
we havent even gotten to the fuselage yet, but im a mechanic.
Charles
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