Now this is what you call a brake calliper unit!!

podge · 19th April 2008, 19:06

Thought you might like to see this, it is a brake unit I fitted to a 747 this afternoon.You can see my hand on one of the 4 rotors(discs) and each one of these is braked by 2 brake discs of the same surface area(unlike car disc pads),all the brakeing areas are pure carbon fibre...they get very hot in service.Each unit has 8 pistons(3000psi), the whole assembly is VERY heavy...don't even ask the price! I had to change this unit as I spotted a siezed brake piston...even 747s have similar brake problems to our cars!As for retarding power, there are 16 such units to an aircraft, swept area...do the sums!!They are very VERY effective, so much so that most crew elect to land on auto-brake, a system that allows you to preselect up to 5 different rate of retardation.This is because if the brakes are applied too hard on landing there is a very real chance of structurally damageing the landing gear.Each wheel has antilock( a superb very sophisticated system),wheel temperature,brake torque applied,tyre pressure,and automatic tyre deflation if too hot and all these parameters(16 main wheels and 2 nose gear) can all be dislayed at once on the flight deck.I hope I have not bored you too much!!...if in the wrong Forum please move it and hope the picture loads after all this. Regards..P.

bad-head-day · 19th April 2008, 20:33

Very interesting mate

smcaul · 19th April 2008, 20:45

I Agree

Westfield or 75 · 19th April 2008, 20:58

Interesting, not at all boring.

Pete · 19th April 2008, 21:00

That looks like it would nicely fit inside my 15" crown alloys. I'd be a bit concerned about the unsprung weight though, and the amount of sensors may be a struggle to fit on the dash. I bet the stopping distances would be pretty incredible!

Joking aside it looks fascinating.

Jürgen · 19th April 2008, 21:09

Quote:

Originally Posted by podge

I hope I have not bored you too much!!

Anything but boring! It's impressive ...

Quote:

Originally Posted by Pete

I bet the stopping distances would be pretty incredible!

Your 75 would have to visit the body shop all too often, Pete. Endless rear end collisions ...

Simon W · 19th April 2008, 22:25

Quote:

Originally Posted by podge

Each unit has 8 pistons(3000psi), the whole assembly is VERY heavy...don't even ask the price!

How much Podge - £40,000 ???

(plus vat of course).

pondweed · 20th April 2008, 07:54

I hope you put a bit of wood under the axle when you jacked it up, just to be sure.

ColinB · 20th April 2008, 13:13

Very interesting post.

19th April 2008, 19:06	#1
podge I really should get out more....... Rover 75 Tourer CDT CLUB SE Copper Red Mica Dec 01 ....now deceased....replaced by2003 Royal Blue T Join Date: Nov 2007 Location: North Warnborough, Hampshire Posts: 2,398 Thanks: 9 Thanked 69 Times in 20 Posts	Now this is what you call a brake calliper unit!! Thought you might like to see this, it is a brake unit I fitted to a 747 this afternoon.You can see my hand on one of the 4 rotors(discs) and each one of these is braked by 2 brake discs of the same surface area(unlike car disc pads),all the brakeing areas are pure carbon fibre...they get very hot in service.Each unit has 8 pistons(3000psi), the whole assembly is VERY heavy...don't even ask the price! I had to change this unit as I spotted a siezed brake piston...even 747s have similar brake problems to our cars!As for retarding power, there are 16 such units to an aircraft, swept area...do the sums!!They are very VERY effective, so much so that most crew elect to land on auto-brake, a system that allows you to preselect up to 5 different rate of retardation.This is because if the brakes are applied too hard on landing there is a very real chance of structurally damageing the landing gear.Each wheel has antilock( a superb very sophisticated system),wheel temperature,brake torque applied,tyre pressure,and automatic tyre deflation if too hot and all these parameters(16 main wheels and 2 nose gear) can all be dislayed at once on the flight deck.I hope I have not bored you too much!!...if in the wrong Forum please move it and hope the picture loads after all this. Regards..P. __________________ 01 75 CDT Club SE Tourer..."The Rover 75 is a British-built car to be proud of." B.M.Ws loss........OUR GAIN!!!!!!!! http://knowledgerush.com/wiki_image/...arp.300pix.jpg http://farm1.static.flickr.com/167/3...b847e1c5_m.jpg Last edited by podge; 19th April 2008 at 19:08..

19th April 2008, 20:45	#3
smcaul Loves to post Rover 75 Saloon CDT Club Join Date: Jan 2008 Location: Southampton Posts: 481 Thanks: 0 Thanked 0 Times in 0 Posts	I Agree __________________ Just a few of my favorite pictures Click Here Freedom isn't free. Somebody paid!

19th April 2008, 21:00	#5
Pete Owners Club Director Rover 75 Join Date: Oct 2006 Location: Sherfield-on-Loddon Posts: 4,874 Thanks: 137 Thanked 996 Times in 444 Posts	That looks like it would nicely fit inside my 15" crown alloys. I'd be a bit concerned about the unsprung weight though, and the amount of sensors may be a struggle to fit on the dash. I bet the stopping distances would be pretty incredible! Joking aside it looks fascinating. __________________ Follow The Club On Twitter

19th April 2008, 20:33	#2
bad-head-day Loves to post Citroen C4 Loeb Join Date: Mar 2007 Location: Staffordshire Posts: 372 Thanks: 0 Thanked 0 Times in 0 Posts	Very interesting mate

19th April 2008, 20:58	#4
Westfield or 75 Banned Rover 75 Saloon 1.8 Classic SE and Westfield 1600i Sport Join Date: Oct 2007 Posts: 74 Thanks: 0 Thanked 0 Times in 0 Posts	Interesting, not at all boring.

20th April 2008, 07:54	#8
pondweed This is my second home Waiter, Waiter! I seem to have a Roomster in my drive... Join Date: Nov 2006 Location: Sussex Posts: 3,268 Thanks: 0 Thanked 1 Time in 1 Post	I hope you put a bit of wood under the axle when you jacked it up, just to be sure.

20th April 2008, 13:13	#9
ColinB Posted a thing or two Rover 75 Tourer 1.8T Club SE Join Date: Nov 2006 Location: Croydon, Surrey Posts: 1,141 Thanks: 3 Thanked 0 Times in 0 Posts	Very interesting post.