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4LS Front Brake.

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Dave P. View Drop Down
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    Posted: 22 Jun 2015 at 18:24
Oh bugger! why is nothing ever simple.
The front brake on my recently acquired 850GT required attention as the lever position on the brake plates was not at the optimum.
So,having dismantled the brakes the problem was obvious.The linings are very worn and in need of replacement.No problem thinks I.New shoes came still in their wrappings with the bike when I bought it.So I stripped and cleaned the brake plates and greased and assembled the new shoes and feeling fairly pleased with myself (always a mistake!)attempted to fit the smart new brakes to the hub.You know what's coming, don't you?
The new linings are too thick!! I can't get the shoes into the brake drum I had a look in Guzziology and lo,it is a known problem.
So now I've got to find someone with a lathe and the right empathy to turn down the linings.I suppose a brake specialist would be the best option but they are now few and far between.Supreme Motorcycles at Earl Shilton used to offer such a service but alas no longer.Any suggestions chaps.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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v7john View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote v7john Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 20:28
What a pain! It's been a while since I've had this done but I used SRM up the road from me in Aberystwyth. Might be worth giving them a ring if you can't find anyone closer. The cost would come from having to send the whole shebang to them wheel and all.
http://www.srmclassicbikes.com/wheels/brakes
1972 V7Sport "The Racing Rhino".
1972 V7 700cc "The Fire Bike".
1954 BSA M33

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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 20:44
Hi John.I'm going to try to avoid sending a wheel off by courier after the trouble I had last time.You may remember the Laverda SFC wheel epic.
I'll try to find someone more local.I would imagine that any engineering shop should be able to carry out the work but I'm not sure if perhaps some specialist knowledge is advantageous.

Edited by Dave P. - 22 Jun 2015 at 20:48
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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v7john View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote v7john Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 20:54
Seems SRM do collection and delivery by TNT but it's pricey!

I agree it's always best to go local if you can. I've just done a 110 mile round trip to take some cables in for modified copies to be made.
1972 V7Sport "The Racing Rhino".
1972 V7 700cc "The Fire Bike".
1954 BSA M33

Read my blog https://racingrhino.wordpress.com/
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 21:05
If you are in Northants ask Ray Dunkley look up Bike Aquablasting he does have a workshop and is Guzzi savvy no idea if he can do this work tho'
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Jerry atric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 21:53
Safety.co.uk might be worth a ring.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 21:54
No! Auto spell on iPad! It's saftek.co.uk
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 22:20
I got mine done at a local machine shop. Took the wheel in and talked the guy through it. Wired the shoes in place and fixed the levers and rods so they didn't flail roast while it was spinning in the lathe. Depends on how much over, but can sometimes punish the heel plates enough to get them in. After 1000 miles they're starting to work better now. Let's see what the MOT man says on Friday....
 
Ian
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ranton_rambler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 22:21
Should have said linish not punish! Auto correct strikes again.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2015 at 22:53
I think linings are supplied oversize so that they can be turned down to exactly fit the drum. Used to be the norm in the days of racing with 2LS brakes.
Brian.

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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2015 at 10:14
Originally posted by ranton_rambler ranton_rambler wrote:


Should have said linish not punish! Auto correct strikes again.

Yes,that did have me wondering.I thought perhaps all heel plates were just very naughty boys.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote italianmotor Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2015 at 10:55
I've had various size brake shoes relined for some of my old singles and they never fit in from the off. I just use a linishing belt on them to get them to fit in, then after a bit of use they're fine. I know the best method is to get them done in conjunction with the hub, but hey, hardly talking hi-tec high-speed machines here, mine I mean. 4LS brakes need more precision maybe. I can highly reccomend Villiers Services for brake shoe relining services.


Edited by italianmotor - 23 Jun 2015 at 10:57
Guzzi lover doing my own thing: http://www.italianmotormagazine.com
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2015 at 12:01
My worn out shoes will end up at Villiers.I've found a company local to me who will undertake to skim the new shoes so all may be well.I'm off there now,cheerio.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 2015 at 15:32
The local machine shop did the job. After assembling the brake this morning, adjusting and fettling I decided that as it was 34c degrees in the workshop I'd go for a ride.(It's 29c in the shade in the garden!!)
The brake is quite impressive, though as it will take time to bed in it may become even better.
The next thing to address is the suspension.The front end is quite hard and as the bloke I bought it from reckons it may have been fitted with a chair at some point that raises an obvious question.Did MG or someone else supply sidecar rated springs back then ?(1972)
It will take a while to get it how I want it.It's not as "friendly" as my 750 Loop.I wonder at the reasons for fitting a five speed box to a bike with more power and torque than it's four speed predecessor.Seems a bit counter intuitive,fashion perhaps?
The 850 isn't as smooth as the 750 but that may be unavoidable given it's longer stroke and higher compression ratio.Sounds like i'm disappointed I guess, but it may just need time to get it right.
Anybody else prefer four speed boxes?????
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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