Today's Message Index:
----------------------
1. 04:21 AM - Yak 52..Sticking Brakes (Sasha)
2. 05:57 AM - Re: Yak 52..Sticking Brakes (A. Dennis Savarese)
3. 07:30 AM - Re: Yak 52..Sticking Brakes (Sasha)
4. 09:30 AM - Re: Yak 52..Sticking Brakes (Jim and Vivian)
5. 10:08 AM - Re: Frances (cpayne1@joimail.com)
6. 12:33 PM - Re: Re: Frances (Terry)
7. 01:25 PM - Re: Yak 52..Sticking Brakes (A. Dennis Savarese)
8. 01:29 PM - Re: Re: Frances (A. Dennis Savarese)
9. 06:01 PM - Re: Yak 52..Sticking Brakes (DENNISDOONAN@aol.com)
Message 1
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| Subject: | Yak 52..Sticking Brakes |
--> Yak-List message posted by: "Sasha" <sashalee@iafrica.com>
Am trying to de-bug a repetitive problem with the brakes on a Yak 52...
Brake pads were recently replaced
Since then the aircraft has been subject to sticking brakes during ground operations.
At one stage 'cycling' the rudders left and right would clear the problem...this
no longer resolves the brake stick..
where must the adjustment be made to permanently release the sticking and retain
brakes effectiveness
Many thanks
Mike
-----Original Message-----
From: "Brian Lloyd"<brianl@lloyd.com>
Sent: 04/09/03 01:11:43 PM
To: "yak-list@matronics.com"<yak-list@matronics.com>
Subject: Re: Yak-List: To Stay Or Not To Stay, That Is The Question.
--> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
Crap. Tropical Storm Ivan just appeared yesterday. They are already
talking about it possibly strengthening to cat 4. It looks like it may
pass south of us about 120 mi but that just means we are pretty well in
the line of fire.
I feel like I am standing at the wrong end of a shooting gallery.
Good luck to those of you in Florida. I hope you have completed your
preparations.
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
+1.340.998.9447 St. Thomas, VI 00802
[Message truncated. Tap Edit->Mark for Download to get remaining portion.]
Message 2
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| Subject: | Re: Yak 52..Sticking Brakes |
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Sometimes old brake bladders can cause the problem. If the rear, felt
grease seal on the back of the drum is bad, it allows grease to exit the hub
which ends up on the brake bladders. Since the bladders are made of real
rubber, they do swell over time when exposed to other petroleum products
such as the grease used on the bearings in the hub.
If you had difficulty sliding the drum over the new brake pads, that is
usually caused by a "swollen" brake bladder. You may try replacing one
brake bladder or the bladder on the wheel that tends to be sticking.
If you did not adjust your brake cable, (primarily in the front cockpit
since it gets used the most), you may try loosening the front brake cable
and have someone in the rear cockpit taxi the airplane with you using the
rear brake handle. See if the brakes stick then. Both brake cables are
attached to the brake reducing valve. Should either one of these brake
cables be too tight, the brake reducing valve will continually apply air
pressure to the bladders. With the bladder or bladders slightly inflated
because of a tight brake cable, it will feel like the brakes are dragging or
binding especially now with the new brake pads. The old brake pads were
worn and therefore were not as close to the drum even with a slightly
swollen or inflated brake bladder.
If you have an air pressure gauge that you can adapt to the B nut fitting at
the end of the brake line going to the main wheels, you can remove the end
at the wheel and insert the air pressure gauge to see if there is a constant
pressure on the bladder. Since the brake reducing valve reduces the
pressure by an 8 to 1 ratio, you should only see about 90 PSI at the brake
line when your main air tank is at 50 ATM's. If you do have air pressure at
the brake line when you first turn on the main air valve and with the rudder
pedals in neutral, you should check the tightness of the brake cables
followed by replacing the brake reducing valve. The brake reducing valve is
under the right floor panel in the rear cockpit. It mounts to the bulkhead.
Good luck and please post whatever you find out.
Dennis
----- Original Message -----
From: "Sasha" <sashalee@iafrica.com>
Subject: Yak-List: Yak 52..Sticking Brakes
> --> Yak-List message posted by: "Sasha" <sashalee@iafrica.com>
>
> Am trying to de-bug a repetitive problem with the brakes on a Yak 52...
> Brake pads were recently replaced
> Since then the aircraft has been subject to sticking brakes during ground
operations.
> At one stage 'cycling' the rudders left and right would clear the
problem...this no longer resolves the brake stick..
> where must the adjustment be made to permanently release the sticking and
retain brakes effectiveness
> Many thanks
> Mike
>
> -----Original Message-----
> From: "Brian Lloyd"<brianl@lloyd.com>
> Sent: 04/09/03 01:11:43 PM
> To: "yak-list@matronics.com"<yak-list@matronics.com>
> Subject: Re: Yak-List: To Stay Or Not To Stay, That Is The Question.
>
> --> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
> Crap. Tropical Storm Ivan just appeared yesterday. They are already
> talking about it possibly strengthening to cat 4. It looks like it
may
> pass south of us about 120 mi but that just means we are pretty well
in
> the line of fire.
>
> I feel like I am standing at the wrong end of a shooting gallery.
>
> Good luck to those of you in Florida. I hope you have completed your
> preparations.
>
> Brian Lloyd 6501 Red Hook Plaza
> brianl@lloyd.com Suite 201
> +1.340.998.9447 St. Thomas, VI 00802
>
>
> [Message truncated. Tap Edit->Mark for Download to get remaining portion.]
>
>
Message 3
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| Subject: | Re: Yak 52..Sticking Brakes |
--> Yak-List message posted by: "Sasha" <sashalee@iafrica.com>
Dennis
Thanks for your most detailed reply
I will work through these and report back
Question; What does a brake reducing valve look?
Many thanks
Mike
-----Original Message-----
From: "A. Dennis Savarese"<adsavar@gte.net>
Sent: 04/09/04 02:56:00 PM
To: "yak-list@matronics.com"<yak-list@matronics.com>
Subject: Re: Yak-List: Yak 52..Sticking Brakes
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Sometimes old brake bladders can cause the problem. If the rear, felt
grease seal on the back of the drum is bad, it allows grease to exit the hub
which ends up on the brake bladders. Since the bladders are made of real
rubber, they do swell over time when exposed to other petroleum products
such as the grease used on the bearings in the hub.
If you had difficulty sliding the drum over the new brake pads, that is
usually caused by a "swollen" brake bladder. You may try replacing one
brake bladder or the bladder on the wheel that tends to be sticking.
If you did not adjust your brake cable, (primarily in the front cockpit
since it gets used the most), you may try loosening the front brake cable
and have someone in the rear cockpit taxi the airplane with you using the
rear brake handle. See if the brakes stick then. Both brake cables are
attached to the brake reducing valve. Should either one of these brake
cables be too tight, the brake reducing valve will continually apply air
pressure to the bladders. With the bladder or bladders slightly inflated
because of a tight brake cable, it will feel like the brakes are dragging or
binding especially now with the new brake pads. The old brake pads were
worn and therefore were not as close to the drum even with a slightly
swollen or inflated brake bladder.
If you have an air pressure gauge that you can adapt to the B nut fitting at
the end of the brake line going to the main wheels, you can remove the end
at the wheel and insert the air pressure gauge to see if there is a constant
pressure on the bladder. Since the brake reducing valve reduces the
pressure by an 8 to 1 ratio, you should only see about 90 PSI at the brake
line when your main air tank is at 50 ATM's. If you do have air pressure at
the brake line when you first turn on the main air valve and with the rudder
pedals in neutral, you should check the tightness of the brake cables
followed by replacing the brake reducing valve. The brake reducing valve is
under the right floor panel in the rear cockpit. It mounts to the bulkhead.
Good luck and please post whatever you find out.
Dennis
----- Original Message -----
From: "Sasha" <sashalee@iafrica.com>
To: <yak-list@matronics.com>
Subject: Yak-List: Yak 52..Sticking Brakes
> --> Yak-List message posted by: "Sasha" <sashalee@iafrica.com>
>
> Am trying to de-bug a repetitive problem with the brakes on a Yak 52...
> Brake pads were recently replaced
> Since then the aircraft has been subject to sticking brakes during ground
operations.
> At one stage 'cycling' the rudders left and right would clear the
problem...this no longer resolves the brake stick..
> where must the adjustment be made to permanently release the sticking and
retain brakes effectiveness
> Many thanks
> Mike
>
> -----Original Message-----
> From: "Brian Lloyd"<brianl@lloyd.com>
> Sent: 04/09/03 01:11:43 PM
> To: "yak-list@matronics.com"<yak-list@matronics.com>
> Subject: Re: Yak-List: To Stay Or Not To Stay, That Is The Question.
>
> --> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
> Crap. Tropical Storm Ivan just appeared yesterday. They are already
> talking about it possibly strengthening to cat 4. It looks like it
may
> pass south of us about 120 mi but that just means we are pretty well
in
> the line of fire.
>
> I feel like I am standing at the wrong end of a shooting gallery.
>
> Good luck to those of you in Florida. I hope you have completed your
> preparations.
>
> Brian Lloyd 6501 Red Hook Plaza
> brianl@lloyd.com Suite 201
> +1.340.998.9447 St. Thomas, VI 00802
>
>
> [Message truncated. Tap Edit->Mark for Download to get remaining portion.]
>
>
Message 4
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| Subject: | Re: Yak 52..Sticking Brakes |
--> Yak-List message posted by: "Jim and Vivian" <jimscjs@mbay.net>
Mike
On the CJ's I hand fit each pad as some are alittle over size, I lightly
sand them on the edges so they have a nice smooth fit, check the return
spring on them also and make sure there all in good shape, you can check the
cable tension also and make sure your not puttin air pressure to the
Bladders by have the cable to tight, just a few thoughts.
Jim
----- Original Message -----
From: "Sasha" <sashalee@iafrica.com>
Subject: Yak-List: Yak 52..Sticking Brakes
> --> Yak-List message posted by: "Sasha" <sashalee@iafrica.com>
>
> Am trying to de-bug a repetitive problem with the brakes on a Yak 52...
> Brake pads were recently replaced
> Since then the aircraft has been subject to sticking brakes during ground
operations.
> At one stage 'cycling' the rudders left and right would clear the
problem...this no longer resolves the brake stick..
> where must the adjustment be made to permanently release the sticking and
retain brakes effectiveness
> Many thanks
> Mike
>
> -----Original Message-----
> From: "Brian Lloyd"<brianl@lloyd.com>
> Sent: 04/09/03 01:11:43 PM
> To: "yak-list@matronics.com"<yak-list@matronics.com>
> Subject: Re: Yak-List: To Stay Or Not To Stay, That Is The Question.
>
> --> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
> Crap. Tropical Storm Ivan just appeared yesterday. They are already
> talking about it possibly strengthening to cat 4. It looks like it
may
> pass south of us about 120 mi but that just means we are pretty well
in
> the line of fire.
>
> I feel like I am standing at the wrong end of a shooting gallery.
>
> Good luck to those of you in Florida. I hope you have completed your
> preparations.
>
> Brian Lloyd 6501 Red Hook Plaza
> brianl@lloyd.com Suite 201
> +1.340.998.9447 St. Thomas, VI 00802
>
>
> [Message truncated. Tap Edit->Mark for Download to get remaining portion.]
>
>
Message 5
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--> Yak-List message posted by: "cpayne1@joimail.com" <cpayne1@matronics.com>
Well the first band has just swept through my area, the
first of about 30 hours worth they say. It's All huricane
All the time on TV. My CJ is lashed down to the hanger
floor, gust locks on, cowling off and stowed, furniture pads
lashed over the canopy and engine....Ole '85' is right in
line for the projected path but well inland.
Maybe the storm track will go North and give Ernie a taste
of the real thing. LOL buddy! One CJ, owned by John Stott of
Punta Gorda got damaged during Charley when parts of his
hanger drifted into the elevator and cowling.
Craig Payne
Message 6
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--> Yak-List message posted by: "Terry" <talew@comcast.net>
----- Original Message -----
From: "cpayne1@joimail.com" <cpayne1@matronics.com>
Subject: Yak-List: Re: Frances
> --> Yak-List message posted by: "cpayne1@joimail.com"
<cpayne1@matronics.com>
>
> Well the first band has just swept through my area, the
> first of about 30 hours worth they say. It's All huricane
> All the time on TV. My CJ is lashed down to the hanger
> floor, gust locks on, cowling off and stowed, furniture pads
> lashed over the canopy and engine....Ole '85' is right in
> line for the projected path but well inland.
>
> Maybe the storm track will go North and give Ernie a taste
> of the real thing. LOL buddy! One CJ, owned by John Stott of
> Punta Gorda got damaged during Charley when parts of his
> hanger drifted into the elevator and cowling.
>
> Craig Payne
>
Hi Craig,
My A/C is in a T hangar at BCT. They havn't reported wx in over two hrs. so
I think they went home. They are showing west wind at 30K to 45 K at PBI and
FLL and I am about halfway between. I removed the radio,xponder,gps and
chutes yesterday
so all I can do now is sit here and watch the boats swing in the breeze.
Good luck out there.
Terry
>
>
Message 7
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| Subject: | Re: Yak 52..Sticking Brakes |
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
I will see if I can find a sketch of one and email it to you off-list. Come
to think of it, if you do have air pressure at the brake line with the
rudder pedals in neutral, you may also have a bad brake differential valve.
That is the mechanism that you can see below the front seat right along the
main spar on the right side. It has a "tiller" arm that moves forward and
back when you move the rudder pedals left or right. You should be able to
see it without removing the front seat. The brake reducing valve output air
pressure goes to the differential valve, then to the wheels.
Regards,
Dennis
----- Original Message -----
From: "Sasha" <sashalee@iafrica.com>
Subject: Re: Yak-List: Yak 52..Sticking Brakes
> --> Yak-List message posted by: "Sasha" <sashalee@iafrica.com>
>
> Dennis
> Thanks for your most detailed reply
> I will work through these and report back
> Question; What does a brake reducing valve look?
> Many thanks
> Mike
>
> -----Original Message-----
> From: "A. Dennis Savarese"<adsavar@gte.net>
> Sent: 04/09/04 02:56:00 PM
> To: "yak-list@matronics.com"<yak-list@matronics.com>
> Subject: Re: Yak-List: Yak 52..Sticking Brakes
> --> Yak-List message posted by: "A. Dennis Savarese"
<adsavar@gte.net>
>
> Sometimes old brake bladders can cause the problem. If the rear, felt
> grease seal on the back of the drum is bad, it allows grease to exit
the hub
> which ends up on the brake bladders. Since the bladders are made of
real
> rubber, they do swell over time when exposed to other petroleum
products
> such as the grease used on the bearings in the hub.
>
> If you had difficulty sliding the drum over the new brake pads, that
is
> usually caused by a "swollen" brake bladder. You may try replacing
one
> brake bladder or the bladder on the wheel that tends to be sticking.
>
> If you did not adjust your brake cable, (primarily in the front
cockpit
> since it gets used the most), you may try loosening the front brake
cable
> and have someone in the rear cockpit taxi the airplane with you using
the
> rear brake handle. See if the brakes stick then. Both brake cables
are
> attached to the brake reducing valve. Should either one of these
brake
> cables be too tight, the brake reducing valve will continually apply
air
> pressure to the bladders. With the bladder or bladders slightly
inflated
> because of a tight brake cable, it will feel like the brakes are
dragging or
> binding especially now with the new brake pads. The old brake pads
were
> worn and therefore were not as close to the drum even with a slightly
> swollen or inflated brake bladder.
>
> If you have an air pressure gauge that you can adapt to the B nut
fitting at
> the end of the brake line going to the main wheels, you can remove the
end
> at the wheel and insert the air pressure gauge to see if there is a
constant
> pressure on the bladder. Since the brake reducing valve reduces the
> pressure by an 8 to 1 ratio, you should only see about 90 PSI at the
brake
> line when your main air tank is at 50 ATM's. If you do have air
pressure at
> the brake line when you first turn on the main air valve and with the
rudder
> pedals in neutral, you should check the tightness of the brake cables
> followed by replacing the brake reducing valve. The brake reducing
valve is
> under the right floor panel in the rear cockpit. It mounts to the
bulkhead.
>
> Good luck and please post whatever you find out.
> Dennis
>
> ----- Original Message -----
> From: "Sasha" <sashalee@iafrica.com>
> To: <yak-list@matronics.com>
> Subject: Yak-List: Yak 52..Sticking Brakes
>
>
> > --> Yak-List message posted by: "Sasha" <sashalee@iafrica.com>
> >
> > Am trying to de-bug a repetitive problem with the brakes on a Yak 52
...
> > Brake pads were recently replaced
> > Since then the aircraft has been subject to sticking brakes during
ground
> operations.
> > At one stage 'cycling' the rudders left and right would clear the
> problem...this no longer resolves the brake stick..
> > where must the adjustment be made to permanently release the
sticking and
> retain brakes effectiveness
> > Many thanks
> > Mike
> >
> > -----Original Message-----
> > From: "Brian Lloyd"<brianl@lloyd.com>
> > Sent: 04/09/03 01:11:43 PM
> > To: "yak-list@matronics.com"<yak-list@matronics.com>
> > Subject: Re: Yak-List: To Stay Or Not To Stay, That Is The
Question.
> >
> > --> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
> >
> > Crap. Tropical Storm Ivan just appeared yesterday. They are
already
> > talking about it possibly strengthening to cat 4. It looks like
it
> may
> > pass south of us about 120 mi but that just means we are pretty
well
> in
> > the line of fire.
> >
> > I feel like I am standing at the wrong end of a shooting
gallery.
> >
> > Good luck to those of you in Florida. I hope you have completed
your
> > preparations.
> >
> > Brian Lloyd 6501 Red Hook Plaza
> > brianl@lloyd.com Suite 201
> > +1.340.998.9447 St. Thomas, VI 00802
> >
> >
> > [Message truncated. Tap Edit->Mark for Download to get remaining
portion.]
> >
> >
>
>
Message 8
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--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Good luck Craig. Sounds like you're well prepared.
Dennis
----- Original Message -----
From: "cpayne1@joimail.com" <cpayne1@matronics.com>
Subject: Yak-List: Re: Frances
> --> Yak-List message posted by: "cpayne1@joimail.com"
<cpayne1@matronics.com>
>
> Well the first band has just swept through my area, the
> first of about 30 hours worth they say. It's All huricane
> All the time on TV. My CJ is lashed down to the hanger
> floor, gust locks on, cowling off and stowed, furniture pads
> lashed over the canopy and engine....Ole '85' is right in
> line for the projected path but well inland.
>
> Maybe the storm track will go North and give Ernie a taste
> of the real thing. LOL buddy! One CJ, owned by John Stott of
> Punta Gorda got damaged during Charley when parts of his
> hanger drifted into the elevator and cowling.
>
> Craig Payne
>
>
Message 9
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| Subject: | Re: Yak 52..Sticking Brakes |
--> Yak-List message posted by: DENNISDOONAN@aol.com
We had a similar problem and it turned out to be a kinked cable housing and
frayed cable at the base of the front cockpit stick. Brakes would apply, but
would not release. Hope this helps.
Dennis Doonan
Sam Patellos
N444YK
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