The BSA A7-A10 Forum

Bikes, Pictures, Stories & more => Chat, Offtopic, Meetings & Everything Else => Topic started by: unclerob on 16.08. 2014 21:17

Title: Strange brake....
Post by: unclerob on 16.08. 2014 21:17
Wondering if anyone knows anything about this front brake on a Norton on ebay....
http://www.ebay.co.uk/itm/111433555964?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
I'm going to have a look at it next week and its a bit of a mystery to me!
Title: Re: Strange brake....
Post by: muskrat on 16.08. 2014 21:32
The bike looks like it'd be fun. Not sure what the brake is off but it's hydraulic operated.
Cheers
Title: Re: Strange brake....
Post by: duTch on 16.08. 2014 23:31

 Interesting brake, looks like a kind of disk operation concept- hard to see if it's double sided..?...and the hose arrangement isn't set up the same as the drawing
Title: Re: Strange brake....
Post by: muskrat on 17.08. 2014 08:43
Looks like it's double sided, there's a torque arm and hose on that side. Rear disc as well.
Hope someone buys it, as shame to see it parted out.
Cheers
Title: Re: Strange brake....
Post by: unclerob on 17.08. 2014 10:59
Getting spare parts for it could definitely be a bit of a problem then!!!!
Thinking about it overnight though I'm sure I've read something somewhere about it....Tuning for Speed maybe?
Looking at the drawing the friction material seems to be part 21 but I still can't really work how its brought into contact, looks like the chap had an interesting folder with it so should find out more soon....
Definitely agree breaking it would be a real shame.....if it doesn't go before I see it then I'll probably rescue it to keep this one company!!
Title: Re: Strange brake....
Post by: muskrat on 17.08. 2014 11:31
Yum Yum nice little tribsa. *loveit*
Title: Re: Strange brake....
Post by: unclerob on 18.08. 2014 18:17
Did go and see the bike (and bought it!), apparently built in France and raced there til the previous owner bought it back a couple of years ago....
All he really knew about the brake was the exploded diagram in the info folder and was told it was designed and made in Bristol and sold as an add on for early Commando's....so will be doing some research!
Title: Re: Strange brake....
Post by: muskrat on 18.08. 2014 20:50
Good onya lucky bugga.
Just put a head & tail light on her and have some fun.
Cheers
Title: Re: Strange brake....
Post by: unclerob on 19.08. 2014 20:07
Found out about the brake....its French made, in approx. 1973, designed by 2 brothers named Luchier originally for endurance racing though a few were sold in the US, fitted to Commando's.
It has slave cylinders each side , pressing clutch like friction plates onto the hub.....
The bike itself was built in France for racing...to Domiracer engine spec I think, though all the paperwork is in French so I might be wrong!!
I'm planning a winter re build Musky and then using it for parades at classic events....too old and too fragile to race it myself nowadays!
Title: Re: Strange brake....
Post by: unclerob on 27.08. 2014 17:06
Whilst I'm in the middle of pulling my new acquisition to bits I thought I'd post a couple more pics of the brake...
It consists of a pair of brake plates with integral slave cylinders that clamp the whole hub between them, quite a clever design really, maybe prone to getting a bit too hot and with something of an issue as far as the torque arms go....since the brake plates move in and out the arms have to be mounted on sliding pins....now very worn!
Luckily there seems to be plenty of friction material left and the seals are round in section instead of being square so should be easy enough to replace...
Title: Re: Strange brake....
Post by: Flatboy 1950 on 27.08. 2014 18:53
Put a pivot in the torque arms .... like the early Honda 750 4 front caliper mount.
Title: Re: Strange brake....
Post by: duTch on 27.08. 2014 23:19
 I think older Beemers have something similar too (caliper pivot)..?
Title: Re: Strange brake....
Post by: WozzA on 28.08. 2014 05:21
sort of like a internal disc brake set up ?   *bright idea*
Title: Re: Strange brake....
Post by: unclerob on 28.08. 2014 11:13
Yes, basically like an internal disc brake except with a complete circle of friction material instead of a pad....
Having thought more about it I'm not so sure that overheating will be that big a problem though, for one thing there is a larger area to actually get hot and its fairly well ventilated, also the separation between the part that actually gets hot and the hydraulic fluid is more than in a normal caliper arrangement....
Not totally sure what either the Honda or Bmw design is like though I'll look for some pics....the problem is the torque arm has to stop the brake plate from rotating (obviously!!) but also allow it to move freely in and out when the brake works...at the moment that's done with a hardened pin on the plate and just a hole drilled in the arm....I'm thinking of bushing the hole and then using the rubber seals from a car type single piston caliper so it can be kept greased....
Title: Re: Strange brake....
Post by: nimrod650 on 20.05. 2015 19:07
didnt the honda cbx 550f2 have internal  front disc brake
Title: Re: Strange brake....
Post by: unclerob on 20.05. 2015 22:21
It did yes but really was just a normal disc brake with a cover, whilst this is more like a pair of clutches inside the wheel. Since I last posted about it I've had the bike running a few times but not far enough....or fast enough!....to know if there is an overheating problem but the brake itself is impressively powerful (had new seals made for it) although there is a clonk as you use it since I've haven't managed to come up with a better way of mounting the torque arms so far.....
Also, out of interest, it was used quite a lot in endurance racing, Bol D'or etc but have been told it was really designed for light aircraft use...
Title: Re: Strange brake....
Post by: nimrod650 on 21.05. 2015 19:32
if as you say it was used for endurance racing overheating wont be a problem