Question Bleed air from break system

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02 Jun 2021 23:46 #3016 by Marc Davidson
Replied by Marc Davidson on topic Bleed air from break system

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02 Jun 2021 23:46 #3015 by Marc Davidson
Replied by Marc Davidson on topic Bleed air from break system
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02 Jun 2021 23:43 #3014 by Marc Davidson
Replied by Marc Davidson on topic Bleed air from break system
Steve,
From the PA-31, PA-31-300 and PA-31-325
7-65. BLEEDING PROCEDURE. If the brake line has been disconnected for any reason, it will be
necessary to bleed the brake system as described below:
a. Place a suitable container at the brake reservoir to collect fluid overflow.
b. Remove the rubber bleeder fitting cap located on the bottom of the brake unit housing on the
landing gear.
c. Slide a hose over the bleeder fitting, loosen the fitting one turn and pressure fill the brake system
with MIL-H-5606 fluid. (Refer to Figure 7-19.)
NOTE
By watching the fluid pass through the plastic hose at the top of
the brake reservoir, it can be determined whether any air remains
in the system. If air bubbles are evident, filling of the system shall
be continued until all of the air is out of the system and a steady
flow of fluid is obtained.
d. Tighten bleeder fitting and remove the hose. Check brakes for proper pedal pressure.
e. Repeat this procedure on the other gear.
f. Drain excess fluid from reservoir to fluid level line with a syringe.
Reissued: 10/12/79 LANDING GEAR AND BRAKE SYSTEM

From PA-350
7-68. BLEEDING PROCEDURE. If the brake line has been disconnected for any reason, it will be
necessary to bleed the brake system as described below:
a. Place a suitable container at the brake reservoir to collect fluid overflow.
b. Remove the rubber bleeder fitting cap located on the bottom of the brake unit housing on the
landing gear.
c. Slide a hose over the bleeder fitting, loosen the fitting one turn and pressure fill the brake system
with MIL-H-5606 fluid. (Refer to Figure 7-25.)
NOTE
By watching the fluid pass through the plastic hose at the top of
the brake reservoir, it can be determined whether any air remains
in the system. If air bubbles are evident, filling of the system shall
be continued until all of the air is out of the system and a steady
flow of fluid is obtained.
d. Tighten bleeder fitting and remove the hose. Check brakes for proper pedal pressure.
e. Repeat this procedure on the other gear.
f. Drain excess fluid from reservoir to fluid level line with a syringe.

From PA-31T2 Cheyenne II XL
8.11 BRAKE SERVICE
The brake system is filled with MlL-H-5606 (petroleum base, red)
hydraulic fluid. This should be checked at every 50 hour inspection and
replenished when necessary.
Do not use vegetable base brake fluids (blue) when refilling the system.
The brake fluid reservoir is filled by opening the access door on the upper
right portion of the nose section, exposing the brake reservoir, and removing
the filler cap. Then add fluid to the reservoir to the required level.
lf it is necessary to bleed the brake system to get air out of the lines, fluid
should be added under pressure at the bleeder on the brake unit.
No adjustment of brake clearances is necessary. lf, after extended
service, braking action requires too much movement of the toe pedal or the
brakes are spongy, check the Service Manual for corrective action.

From PA-31T3 T1040
BLEEDING PROCEDURE.
If the brake line has been disconnected for any reason, it will be necessary to bleed the brake system as
described below:
1. Place a suitable container at the brake reservoir to collect fluid overflow.
2. Remove the rubber bleeder fitting cap located on the bottom of the brake unit housing on the landing
gear.
3. Slide a hose over the bleeder fitting, loosen the fitting one turn and pressure fill the brake system with
MIL-H-5606 fluid. (Refer to Figure 32-24.)
-NOTE By watching the fluid pass through the plastic hose at the top of the brake
reservoir, it can be determined whether any air remains in the system. If air
bubbles are evident, filling of the system shall be continued until all of the
air is out of the system and a steady flow of fluid is obtained.
4. Tighten bleeder fitting and remove the hose. Check brakes for proper pedal pressure.
5. Repeat this procedure on the other gear.
6. Drain excess fluid from reservoir to fluid level line with a syringe.

That's all I got,
Hope it helps. Looks like I misspoke on the sections in my previous post. Above is a copy paste from the manuals.
Let me know if you need anything else.
Marc

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02 Jun 2021 13:05 #3013 by STEVE ELLS
Replied by STEVE ELLS on topic Bleed air from break system
Hi Marc;
I looked in my PA 31 (310-325) and (350) manual and wasn't able to find the chapters you referred to.
Do you have time to copy and paste the procedure you're referring to??

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02 Jun 2021 08:34 #3011 by Mark Frnka
Replied by Mark Frnka on topic Bleed air from break system
I am having the exact same issue in my PA-42. Did you ever figure out the issue?

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25 Feb 2019 20:28 #1703 by Marc Davidson
Replied by Marc Davidson on topic Bleed air from break system
The procedure that you have described I believe is incorrect.
I have the Maintenance manuals for the PA-31T2 and the PA-31 and both brake bleeding descriptions are the same (not what you described)
Please refer to your maintenance manual section 8 try 8.9
This is handy...I mean a must
aircraft-tool.com/shop/detail.aspx?id=225DX
This in gallon jugs, need 2 probably...
www.aviall.com/aviallstorefront/p/1045377=CP
Then try the described technique in the manual and see if it works.

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