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How This Braking System Works?  
User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Posted (12 years 2 months 3 weeks 4 days 6 hours ago) and read 3213 times:


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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

18 replies: All unread, jump to last
 
User currently offlineCovert From Ghana, joined Oct 2001, 1456 posts, RR: 2
Reply 1, posted (12 years 2 months 3 weeks 4 days 6 hours ago) and read 3169 times:

Hmm, Russkie....Kinda looks like drum brakes to me...I don't know...


thank goodness for TCAS !
User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Reply 2, posted (12 years 2 months 3 weeks 4 days 5 hours ago) and read 3181 times:

mmmm i guess they are drum brakes.

jgore  Smile


User currently offlineCovert From Ghana, joined Oct 2001, 1456 posts, RR: 2
Reply 3, posted (12 years 2 months 3 weeks 4 days 5 hours ago) and read 3164 times:


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...



thank goodness for TCAS !
User currently offlineSi02y From Singapore, joined Nov 2001, 23 posts, RR: 0
Reply 4, posted (12 years 2 months 3 weeks 4 days 5 hours ago) and read 3157 times:

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.


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 5, posted (12 years 2 months 3 weeks 4 days 5 hours ago) and read 3158 times:

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.

User currently offlineAirplay From , joined Dec 1969, posts, RR:
Reply 6, posted (12 years 2 months 3 weeks 4 days 5 hours ago) and read 3151 times:

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.


User currently offlineCovert From Ghana, joined Oct 2001, 1456 posts, RR: 2
Reply 7, posted (12 years 2 months 3 weeks 4 days 5 hours ago) and read 3151 times:

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


thank goodness for TCAS !
User currently offlineVictech From United States of America, joined Jun 2000, 546 posts, RR: 2
Reply 8, posted (12 years 2 months 3 weeks 4 days 4 hours ago) and read 3141 times:

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

Actually, I think planes today use a hydraulic fluid akin to (if not actually) Skydrol...


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 9, posted (12 years 2 months 3 weeks 4 days 4 hours ago) and read 3142 times:

They use Skydrol - not DOT3

User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 10, posted (12 years 2 months 3 weeks 3 days 23 hours ago) and read 3099 times:

Looking at the condition of those tires you have to wonder what else they are doing/not doing to their aircraft.

User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2148 posts, RR: 10
Reply 11, posted (12 years 2 months 3 weeks 3 days 22 hours ago) and read 3059 times:

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.

User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 12, posted (12 years 2 months 3 weeks 3 days 19 hours ago) and read 3054 times:

C'mon LMP737, that tire isn't THAT bad??
Maybe their GMM has different thru flight limits  Big thumbs up


User currently offlineT prop From United States of America, joined Apr 2001, 1029 posts, RR: 1
Reply 13, posted (12 years 2 months 3 weeks 3 days 19 hours ago) and read 3047 times:

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.


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 14, posted (12 years 2 months 3 weeks 3 days 19 hours ago) and read 3040 times:

Cdfmxtech:

It looks like they ran out of black marker at Kras Air.  Big grin


User currently offlineWilcharl From United States of America, joined Jun 2000, 1168 posts, RR: 3
Reply 15, posted (12 years 2 months 3 weeks 3 days 19 hours ago) and read 3034 times:

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

User currently offlineLZ-TLT From Germany, joined Apr 2001, 431 posts, RR: 0
Reply 16, posted (12 years 2 months 2 weeks 6 days 14 hours ago) and read 2917 times:

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


User currently offlineA320-Tech From United States of America, joined Jan 2002, 38 posts, RR: 2
Reply 17, posted (12 years 2 months 2 weeks 6 days 5 hours ago) and read 2848 times:

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


User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Reply 18, posted (12 years 2 months 2 weeks 4 days 8 hours ago) and read 2778 times:

Thank you guys for your 2 cents.

jgore  Smile


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