Today's Message Index:
----------------------
1. 08:38 PM - Brakes have me stumped (David Carr)
2. 09:25 PM - Re: Brakes have me stumped (Kelly McMullen)
3. 09:38 PM - Re: Brakes have me stumped (Kelly McMullen)
4. 09:46 PM - Re: Brakes have me stumped (Bob Leffler)
5. 10:36 PM - Re: Brakes have me stumped (Peter)
Message 1
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| Subject: | Brakes have me stumped |
Hi list,
The brakes have me stumped. I recently removed my brake linings (Matco
brakes) and found that they were showing checking/cracking as shown the
attached photos. In speaking with Matco, I learned that this is caused by
excessive heat which is likely caused by the brakes dragging.
Matco suggested that I should be able to squeeze the brake pistons by hand
and cause them to retract (makes sense). Unfortunately, this was very
difficult to do with mine, indicating there is some sort of restriction.
To narrow this down I sequentially:
- Bypassed the notorious parking brake valve
- Disconnected the master cylinder pushrods from the pedals to ensure
they're fully extended
- Removed the reservoir cap (why not)
Despite these changes I still find it very difficult to squeeze the pistons
in. I'm starting to wonder if it's possible that a) my -3 Bonaco brake
lines are restrictive, b) there's another problem I haven't thought of, or
c) that is is all a wild goose chase and it's always hard to squeeze the
pistons in.
Any ideas out there? I'd appreciate the help.
David
Message 2
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| Subject: | Re: Brakes have me stumped |
I can't comment on the Matco brakes, as I have the Clevelands. I do
however have the Bonaco lines. I have never been able to push the piston
back in on any Cleveland brake that was hooked up to a system, only if
there was no line connected. I always used a cushioned C clamp to push
the piston back in if I was replacing pads.
I have found the MS O-rings that Clevelands come with do not tolerate
the heat generated by the -10 brakes. So I have the Viton O-rings and
the synthetic equivalent to 5606 brake fluid (Royco 782?). I was able to
get the O-rings from Spruce.
The minute variation in the brake disc pushes the piston back just
enough so they don't drag. If you can push your plane by hand without a
lot of effort, on a flat surface, your brakes are not dragging. If they
drag, it is both hard to push and you generally can hear the dragging.
On 4/28/2019 8:36 PM, David Carr wrote:
> Hi list,
>
> The brakes have me stumped. I recently removed my brake linings (Matco
> brakes) and found that they were showing checking/cracking as shown the
> attached photos. In speaking with Matco, I learned that this is caused
> by excessive heat which is likely caused by the brakes dragging.
>
> Matco suggested that I should be able to squeeze the brake pistons by
> hand and cause them to retract (makes sense). Unfortunately, this was
> very difficult to do with mine, indicating there is some sort of
> restriction. To narrow this down I sequentially:
> - Bypassed the notorious parking brake valve
> - Disconnected the master cylinder pushrods from the pedals to ensure
> they're fully extended
> - Removed the reservoir cap (why not)
>
> Despite these changes I still find it very difficult to squeeze the
> pistons in. I'm starting to wonder if it's possible that a) my -3
> Bonaco brake lines are restrictive, b) there's another problem I haven't
> thought of, or c) that is is all a wild goose chase and it's always hard
> to squeeze the pistons in.
>
> Any ideas out there? I'd appreciate the help.
>
> David
Message 3
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| Subject: | Re: Brakes have me stumped |
Looking at your photos, yes, it is possible they got a bit hot. However, it
is also possible the rivets were squeezed a little too tight. That will
cause cracking around the rivets.
They only need to be tight enough that you can't move the pad on the
backing plate by hand.
Sent from my TRS-80 Model 100
On Sun, Apr 28, 2019 at 8:42 PM David Carr <junk@dcarr.org> wrote:
> Hi list,
>
> The brakes have me stumped. I recently removed my brake linings (Matco
> brakes) and found that they were showing checking/cracking as shown the
> attached photos. In speaking with Matco, I learned that this is caused by
> excessive heat which is likely caused by the brakes dragging.
>
> Matco suggested that I should be able to squeeze the brake pistons by hand
> and cause them to retract (makes sense). Unfortunately, this was very
> difficult to do with mine, indicating there is some sort of restriction.
> To narrow this down I sequentially:
> - Bypassed the notorious parking brake valve
> - Disconnected the master cylinder pushrods from the pedals to ensure
> they're fully extended
> - Removed the reservoir cap (why not)
>
> Despite these changes I still find it very difficult to squeeze the
> pistons in. I'm starting to wonder if it's possible that a) my -3 Bonaco
> brake lines are restrictive, b) there's another problem I haven't thought
> of, or c) that is is all a wild goose chase and it's always hard to squeeze
> the pistons in.
>
> Any ideas out there? I'd appreciate the help.
>
> David
>
Message 4
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| Subject: | Re: Brakes have me stumped |
I went through this a couple years ago.
1. I installed return springs on the cylinders to ensure they were wide o
pen when not depressed.
2. I had an incident in which I had to taxi back to the hangar with highe
r than normal rpm. This got everything extremely hot. I was having all
kinds of problems getting decent life out the pads afterwards. I had to
replace the rotors and the spacers because they became deformed due to the
heat. The spacers can also flare at the ends if they are over torqued and
hit up. What I found was the the various parts were hanging up and not m
oving freely.
If the inner shoe pad doesn=92t move freely, you may want to examine the sp
acer they ride on. Similarly there is another set of spacers the calipers
ride on. Can you move either of these freely with you hands?
Have you checked your rotors to ensure they aren=92t warped? The same goe
s for the plate that the pads are riveted. They can warp if over heated t
o.
It wasn=92t until I replaced all of these that brakes started functioning p
roperly. I can=92t say these are your issues, but it does give you other t
hings to check.
Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: owner-rv10-list-server@matronics.com on behalf of David Carr <junk@dc
arr.org>
Sent: Sunday, April 28, 2019 11:50 PM
Subject: RV10-List: Brakes have me stumped
Hi list,
The brakes have me stumped. I recently removed my brake linings (Matco bra
kes) and found that they were showing checking/cracking as shown the attach
ed photos. In speaking with Matco, I learned that this is caused by excess
ive heat which is likely caused by the brakes dragging.
Matco suggested that I should be able to squeeze the brake pistons by hand
and cause them to retract (makes sense). Unfortunately, this was very diff
icult to do with mine, indicating there is some sort of restriction. To na
rrow this down I sequentially:
- Bypassed the notorious parking brake valve
- Disconnected the master cylinder pushrods from the pedals to ensure they'
re fully extended
- Removed the reservoir cap (why not)
Despite these changes I still find it very difficult to squeeze the pistons
in. I'm starting to wonder if it's possible that a) my -3 Bonaco brake li
nes are restrictive, b) there's another problem I haven't thought of, or c)
that is is all a wild goose chase and it's always hard to squeeze the pist
ons in.
Any ideas out there? I'd appreciate the help.
David
Message 5
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| Subject: | Re: Brakes have me stumped |
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