jgore
Posts: 518
Joined: Sun Feb 17, 2002 2:41 am

How This Braking System Works?

Sun Oct 06, 2002 2:43 am


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Photo © Niksa Radicevic



Are those hydraulic tubes responsible for activate the braking system ?. Is this braking system like those non-disk brakes found on cars ?.
Thanks in advance.

Jgore  Smile
 
covert
Posts: 1507
Joined: Sun Oct 21, 2001 1:02 am

RE: How This Braking System Works?

Sun Oct 06, 2002 2:54 am

Hmm, Russkie....Kinda looks like drum brakes to me...I don't know...
none
 
jgore
Posts: 518
Joined: Sun Feb 17, 2002 2:41 am

RE: How This Braking System Works?

Sun Oct 06, 2002 2:58 am

mmmm i guess they are drum brakes.

jgore  Smile
 
covert
Posts: 1507
Joined: Sun Oct 21, 2001 1:02 am

RE: How This Braking System Works?

Sun Oct 06, 2002 3:05 am


By the way, I didn't even have to click on the picture to read the description to see that that was a Russian aircraft, the balding tire and mechanical ugliness was a dead giveaway...just a thought...
none
 
si02y
Posts: 24
Joined: Wed Nov 14, 2001 1:05 pm

RE: How This Braking System Works?

Sun Oct 06, 2002 3:09 am

Look at the state of those tyres.... tsk tsk tsk! a blow out waiting to happen!
Hydraulic brakes, yes, note the 4 pistons visible on the inboard side of the boutbard tyre and u shaped tubing at the top of the wheel. Most likely steel discs.
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: How This Braking System Works?

Sun Oct 06, 2002 3:25 am

Large aircraft brakes have large stationary dics, and rotors are keyed. The keyed rotors fit into the wheel which is keyed. When brakes are applied, hydraulics are ported to pistons which are usually evenly spaced around the dics. Pressure is applied and brakes are applied.
 
airplay
Posts: 3369
Joined: Sat Oct 25, 2003 1:58 am

RE: How This Braking System Works?

Sun Oct 06, 2002 3:41 am

Those look like disc brakes to me. The little raised portions in the castings suggest movement towards the tire.

The very small lines are the hydraulic lines. The large tubes are more likely some kind of support and shock absorber.
 
covert
Posts: 1507
Joined: Sun Oct 21, 2001 1:02 am

RE: How This Braking System Works?

Sun Oct 06, 2002 3:44 am

I wonder if airplanes use DOT3 brake fluid too.........
none
 
victech
Posts: 541
Joined: Sun Jun 11, 2000 9:46 am

RE: How This Braking System Works?

Sun Oct 06, 2002 4:22 am

I wonder if airplanes use DOT3 brake fluid too.........

Actually, I think planes today use a hydraulic fluid akin to (if not actually) Skydrol...
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: How This Braking System Works?

Sun Oct 06, 2002 4:32 am

They use Skydrol - not DOT3
 
LMP737
Posts: 4943
Joined: Wed May 08, 2002 4:06 pm

RE: How This Braking System Works?

Sun Oct 06, 2002 9:14 am

Looking at the condition of those tires you have to wonder what else they are doing/not doing to their aircraft.
Never take financial advice from co-workers.
 
UAL Bagsmasher
Posts: 1839
Joined: Wed Sep 08, 1999 12:52 pm

RE: How This Braking System Works?

Sun Oct 06, 2002 10:43 am

Yeah they are using phosphate-ester based fluid (Skydrol), which, like car brake fluid, is harmed by moisture contamination of any sort. The seals used in that system are made of either butyl rubber or ethylene-propylene elastomers.
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: How This Braking System Works?

Sun Oct 06, 2002 1:09 pm

C'mon LMP737, that tire isn't THAT bad??
Maybe their GMM has different thru flight limits  Big thumbs up
 
T prop
Posts: 915
Joined: Tue Apr 03, 2001 4:33 pm

RE: How This Braking System Works?

Sun Oct 06, 2002 1:26 pm

Maybe the GMM says roll the aircraft forward till that part is on the bottom  Big thumbs up

A few other things about automotive brake fluid. DOT3 boils at something like 450degF aircraft brakes can get a lot hotter than that. Also it contains alcohol making it a little more flammable.

Does anyone know what Russian aircraft actually use in thier hydraulic syatems? Is it petroleum based like 5606 or something with a phospate ester base?

T prop.
 
LMP737
Posts: 4943
Joined: Wed May 08, 2002 4:06 pm

RE: How This Braking System Works?

Sun Oct 06, 2002 1:44 pm

Cdfmxtech:

It looks like they ran out of black marker at Kras Air.  Big grin
Never take financial advice from co-workers.
 
User avatar
wilcharl
Posts: 1164
Joined: Sun Jun 25, 2000 11:19 am

RE: How This Braking System Works?

Sun Oct 06, 2002 1:55 pm

i once read a blirb saying that a russian pilot saved the day by topping off a leaky hyd. reseivor with coffee... (something i personaly do not believe)... no bowser access from the inside of the aircraft etc... but nothing would surprise me
 
LZ-TLT
Posts: 427
Joined: Mon Apr 23, 2001 10:34 am

RE: How This Braking System Works?

Thu Oct 10, 2002 6:37 pm

I wonder why there is Skydrol used for braking systems and not silicone-based brake fluid(somehow similar to the DOT5 car brake fluid), which is completely unaffected by moisture and so on.

As for the brakes in the photo - multi disk brakes
 
A320-Tech
Posts: 38
Joined: Sun Jan 27, 2002 11:49 am

RE: How This Braking System Works?

Fri Oct 11, 2002 3:08 am

LOL "Different Through Flight Limits"? .... umm ya ... from the Kras Air GMM .. 'Do not replace tire untill you see the METAL CHORD.. outer string bonding wear - through is A-OK until you get back home' ...
just kidding  Smile/happy/getting dizzy

A320-Tech
 
jgore
Posts: 518
Joined: Sun Feb 17, 2002 2:41 am

RE: How This Braking System Works?

Sun Oct 13, 2002 12:17 am

Thank you guys for your 2 cents.

jgore  Smile

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