Re: dem brakes

robert hensarling · Post by **robert hensarling** » Mon Jan 14, 2002 7:38 am

'Well guys, I still have a bit of a problem with "dem brakes". I've replaced the fluid with the Dot 5 as per the Fairchild article. Followed the instructions to the letter, there's not one bubble in the system. Then, I put 5 lbs. pressure in the reservoir and bled them from the top, just a little at a time before adding more dot 5 and repressurizizing. The brakes work just fine after I pump them up a few times, but need to be re-pumped up after about 2 or 3 minutes.
Herby Carper (Master PT-19 restorer of 15 years on the same airplane) thinks the brake blocks may be worn down to the point that it takes extra pumping to get enough fluid in the expander tubes to activate the brakes, then when it's not being used the springs in the blocks allow the fluid back up the tubes. I haven't had the wheels off, so I don't know the condiditon of the blocks. Is that the logical next step? Also, there's no leaking of fluid anywhere I can see, the master cylinders show no indication of it either.
The good thing is that at least I have brakes (after pumping a few times), which is far better that what I had before..
Robert Hensarling
rhrocker@hilconet.com
www.mesquiterocker.com
Uvalde, Texas

[Non-text portions of this message have been removed]'

Marge & John Berendt · Mon Jan 14, 2002 9:13 am

'Bob

There shoud be only about .020 clearance between the blocks and the brake
drum. You can check this by looking through the little slots on the backing
plate. Use a feeler gauge to check them. Check this with the rakes relaxed
and then with the brakes being punped up.

John Berendt

----- Original Message -----
From: "robert hensarling"
To:
Sent: Monday, January 14, 2002 7:39 AM
Subject: [fairchildclub] dem brakes

> Well guys, I still have a bit of a problem with "dem brakes". I've
replaced the fluid with the Dot 5 as per the Fairchild article. Followed
the instructions to the letter, there's not one bubble in the system. Then,
I put 5 lbs. pressure in the reservoir and bled them from the top, just a
little at a time before adding more dot 5 and repressurizizing. The brakes
work just fine after I pump them up a few times, but need to be re-pumped up
after about 2 or 3 minutes.
> Herby Carper (Master PT-19 restorer of 15 years on the same airplane)
thinks the brake blocks may be worn down to the point that it takes extra
pumping to get enough fluid in the expander tubes to activate the brakes,
then when it's not being used the springs in the blocks allow the fluid back
up the tubes. I haven't had the wheels off, so I don't know the condiditon
of the blocks. Is that the logical next step? Also, there's no leaking of
fluid anywhere I can see, the master cylinders show no indication of it
either.
> The good thing is that at least I have brakes (after pumping a few times),
which is far better that what I had before..
> Robert Hensarling
> rhrocker@hilconet.com
> www.mesquiterocker.com
> Uvalde, Texas
>
>
> [Non-text portions of this message have been removed]
>
>
>
> To unsubscribe from this group, send an email to:
> fairchildclub-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

'

Michael Denest · Post by **Michael Denest** » Mon Jan 14, 2002 4:06 pm

'--- robert hensarling wrote:

> Well guys, I still have a bit of a problem with "dem
> brakes". I've replaced the fluid with the Dot 5 as
> per the Fairchild article. Followed the
> instructions to the letter, there's not one bubble
> in the system. Then, I put 5 lbs. pressure in the
> reservoir and bled them from the top, just a little
> at a time before adding more dot 5 and
> repressurizizing. The brakes work just fine after I
> pump them up a few times, but need to be re-pumped
> up after about 2 or 3 minutes.

Robert,
You won't see any leakage at all on the exterior. The
leaking is in the master cylinders themselves. Drain
the fluid, remove the cylinders and replace the seals
with the NAPA seal kits. This is the fix, there is
nothing wrong with the brake blocks.

Mike

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robert hensarling · Post by **robert hensarling** » Mon Jan 14, 2002 5:10 pm

'

----- Original Message -----
From: "Michael Denest"
To:
Sent: Monday, January 14, 2002 4:06 PM
Subject: Re: [fairchildclub] dem brakes

Thanks Mike, I was dreading tearing into the brake blocks. I think I recall
that someone posted the NAPA specs for the seals a couple of weeks ago, but
I failed to file that info away. Anyone remember what the NAPA part number
is?
Robert Hensarling

>
> Robert,
> You won't see any leakage at all on the exterior. The
> leaking is in the master cylinders themselves. Drain
> the fluid, remove the cylinders and replace the seals
> with the NAPA seal kits. This is the fix, there is
> nothing wrong with the brake blocks.
>
> Mike
>
> __________________________________________________
> Do You Yahoo!?
> Send FREE video emails in Yahoo! Mail!
> http://promo.yahoo.com/videomail/
>
>
> To unsubscribe from this group, send an email to:
> fairchildclub-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

'

Pilot4906@aol.com · Post by **Pilot4906@aol.com** » Mon Jan 14, 2002 9:13 pm

'NAPA 190 master brake repair kit I think....

[Non-text portions of this message have been removed]'

WALTER ALBERT · Post by **WALTER ALBERT** » Mon Jan 14, 2002 9:52 pm

'THE gap between the brake blocks and the brake drum should be between 7 and
ten thousands. this can be measured by flipping the tabs on the brake
assembly. walt

----- Original Message -----
From: robert hensarling
To:
Sent: Monday, January 14, 2002 8:39 AM
Subject: [fairchildclub] dem brakes

> Well guys, I still have a bit of a problem with "dem brakes". I've
replaced the fluid with the Dot 5 as per the Fairchild article. Followed
the instructions to the letter, there's not one bubble in the system. Then,
I put 5 lbs. pressure in the reservoir and bled them from the top, just a
little at a time before adding more dot 5 and repressurizizing. The brakes
work just fine after I pump them up a few times, but need to be re-pumped up
after about 2 or 3 minutes.
> Herby Carper (Master PT-19 restorer of 15 years on the same airplane)
thinks the brake blocks may be worn down to the point that it takes extra
pumping to get enough fluid in the expander tubes to activate the brakes,
then when it's not being used the springs in the blocks allow the fluid back
up the tubes. I haven't had the wheels off, so I don't know the condiditon
of the blocks. Is that the logical next step? Also, there's no leaking of
fluid anywhere I can see, the master cylinders show no indication of it
either.
> The good thing is that at least I have brakes (after pumping a few times),
which is far better that what I had before..
> Robert Hensarling
> rhrocker@hilconet.com
> www.mesquiterocker.com
> Uvalde, Texas
>
>
> [Non-text portions of this message have been removed]
>
>
>
> To unsubscribe from this group, send an email to:
> fairchildclub-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

'