Manky Monkey Motors

Hi. lads new to the Manky motors. Can some one help me out I have a Gs850 chopper trike with a Escort axle I have just upgraded from drum to disc and the sierra calipers the brake master cylinder is a1970's Land rover much the same look as the Girling master cylinder but I don't now the bore size  and standard brake pipe and still not getting good brakes am I not letting the brake pad's bed in but I have been out most of the day on it can some one help
cheers Ally(http://)

Welcome to MankyWorld Ally  ;) Nice to have you aboard.
Well, I can tell you the LandRover cylinder's 3/4" bore, if that helps.
Beyond that, not really sure where to start advising. I don't know the Sierra set up.
Anyone?

Oh, by the way. Nice trike! Any chance of a write up for the site?
(don't worry, it's become habit to hassle all newbies for contributions  :) )

I gotta agree with Manky, that trike is extremely pleasing to the eye, it's beautifull.


 8) 8) 8)

Very nice looking Trike that!

The problem is a mixture of things probably!

If you are sure that they are free of air then you probably need a smaller bore master cylinder or greater leverage on the brake pedal! 

The landrover master cylinder is trying to shift enough fluid to operate 4 brakes not 2. 

Twin disc on a bike would use a 5/8 bore with a ratio in the lever of 6 to 1 ish, so the lever that you pull on is about 6 to 7 times longer than the part of the lever that operates the piston in the master cylinder.

You may get away with using the landrover master cylinder if you can alter the ratio.

Hope that helps! (And makes sense)

Thanks Byz.
See- I preside, (allegedly), over this little virtual transport cafe, but I rely on the more informed ones to step forward & sort out the problems. There's usually someone here, somewhere who'll know the answers -but it's rarely me.  :(

Many Many thanks Lad's but haw do I alter the ratio?   I think I will go and measure the pedals and the length of the rod to the master cylinder and  may be get a new 5/8 cylinder will get back to you soon Ally

Hi Lads sorry for delay in getting back.  I've been on my hol's.  My  bro's been at the work shop and as set up the master cylinder and moved the forward controls the foot pedels is 200mm and the bracket that holds the bar is 90mm and the bar is 420mm long(http://)(http://[img])[/img] hope you can see what he as done
Ally

(http://)

So has that sorted the problem?
When we gonna get a write up & some photos of this trike of yours then Ally?

Not to sure as I am trying to get the new pads beded in. Am going offshore  :'(for three weeks so I will put pen to paper and hope to have some thing for you when I get back
Thanks Ally (http://)

the photo looks to show about a 2.5 : 1 ratio. pedal could do with being twice as long you need to measure from centre of pivot point of the pedal (where footpeg shaft passes through pedal) to upper end (where your toes would be) and then from pivot point down to centre of bolt in the "drop arm" that holds the "pushrod/linkage". Or you can shorten the "drop arm" by 50%+/-, which would give the same effect, ie: better leverage. I would also advise you to eliminate the exposed thread on the pushrod/linkage adjuster (put a nut or two on it, this will also act as a locknut!!...or make another to the required length,) as this is the thinnest/weakest part of the system and could/will bend under pressure.
regards
pete

Oh by the way.........good looking trike ;D

OK Guys thats me home  I've been down to the trike and my brother moved the brake bar up and we have brake's so many thanks for all who helped many thanks  Pete. it's been a race to get it done for the saints and sinners rally but we got there and it went through the m.o.t I have a write up and photos coming soon 
Ally :) :) :) :) :) :) :) :) :) :) :) :) :)

Woo hoo!  ;D

   nice trike fella, I really don't mean to pick but do yourself a favour and put a washer on the rod end bolt, large enough that if it fails (the rod end I mean, and they do) and the centre pulls out, the rod wont fall off of the linkage. Ask me how I know !

OK how do you know  ;D

Come on boy, spill the beans....How do you know?
K

Emailed to me by Brock:

This wasn't actually caused by a collapsed rod end but it did loose two in the process, the one with captive washer held , the other didn't and that was what gave me problems when stopping. Luckily we were only doing about 35 mph at the time

LOVE the title of that phot - succinct or what!

I remember seeing a rally car with the front end in similar state - it took off over a 'yump' and the driver didn't wait for it to land before turning the wheel for the upcoming 90 right...............  oops.

sorry, my mistake , should read 135 mph

wow, good job you weren't going fast then steve ;D