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front brake conical hub #50869
01/07/07 12:35 pm
01/07/07 12:35 pm
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline OP
BritBike Forum member
Ger B  Offline OP
BritBike Forum member
G

Joined: Sep 2005
Posts: 5,963
NL
With my wife away in Brasil for a couple of weeks I finally found the time to do some work I wanted to do in November, when I asked questions about it here.
The bike stands safely in the living room, so she cannot see it...

I opened the front brake just to have a look at its condition. I never had it open before.
The shoes and lining material looks good, not hardened or glazed. Carrying surface between 90 and 95 %. The hub is a conical hub, BSA A65T 1971.

Question-1: I could unscrew by hand the nut which pulls the brake anchor plate towards the hub. How tight should this nut be?

Question-2: What is the standard thickness of the brake lining material? The thickness now is 4.5-mm, a little less than 3/16 of an inch; and it is practically the same all over the shoe. Liners are glued, not riveted.

Question-2: What is the standard ID of the iron (or steel) bushing inside the hub? I now measure 203.4-mm, equaling 8 inches head on.

My gut feeling says it's near perfect, but I happen to like to compare figures.
Thanks.


Ger B

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Re: front brake conical hub #50870
01/07/07 1:57 pm
01/07/07 1:57 pm
Joined: Aug 2001
Posts: 4,245
argyll. scotland, uk
gavin eisler Offline
BritBike Forum member
gavin eisler  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 4,245
argyll. scotland, uk
Hi Ger
Happy New Year

Question-1: I could unscrew by hand the nut which pulls the brake anchor plate towards the hub. How tight should this nut be?
Not hand tight, I loctite this nut on and tighten with the axle gripped in a vice.

Question-2: What is the standard thickness of the brake lining material? The thickness now is 4.5-mm, a little less than 3/16 of an inch; and it is practically the same all over the shoe. Liners are glued, not riveted.

New linings were 3/16", complete shoes were Lockheed 4523-166 , the linings material was Ferodo AM14 (probably superseded with modern equivalent)

Question-2: What is the standard ID of the iron (or steel) bushing inside the hub? I now measure 203.4-mm, equaling 8 inches head on.

Std 203.2 mm ( shoe diam from manual)

Sounds like nothing is too far out of spec.
Get all traces of rust out of the hub, lube the cam pivots and loctite the centre nut on .
If the centre nut gets very loose you get a clunk from the front end as the wheel moves around.
Most critical part of this assembly ( fastest wearing) is the brake cable , it must be A1 condition, and not fitted with a brake light switch, the switch causes sponginess and lost effort.
Cheers
pod


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: front brake conical hub #50871
01/07/07 2:16 pm
01/07/07 2:16 pm
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline OP
BritBike Forum member
Ger B  Offline OP
BritBike Forum member
G

Joined: Sep 2005
Posts: 5,963
NL
Hi, Pod. Happy New Year to you as well.

Everything is clean now, and as nothing is out of spec, I'll re-assemble the brake, and spill a drop of loctite on the centre nut thread.

There is a brake light switch in the cable but, being a bit of an originality person, I like to keep it. Though I made it lighter (reacting faster) by cutting thin slices off the rubber inside.
What bothered me about this brake was the return movement of the two levers. But this had nothing to do with the brake components. I found it was the spring around the inner cable core between the levers. It got caught in the inside lever. This caused the spring to expand to more length and loose strength. This also obstructed the movement of the lever.

So now we wait for the rains to go away.

Cheers,

Ger.


Ger B

Re: front brake conical hub #50872
01/07/07 4:52 pm
01/07/07 4:52 pm
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline OP
BritBike Forum member
Ger B  Offline OP
BritBike Forum member
G

Joined: Sep 2005
Posts: 5,963
NL
Rich B: I answered your e-mail via your private email account. Thanks.


Ger B

Re: front brake conical hub #50873
01/09/07 5:15 am
01/09/07 5:15 am
Joined: Oct 2003
Posts: 11,269
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member

Joined: Oct 2003
Posts: 11,269
North Georgia, USA
Ger -
Most 35 yo brakes can be improved with new linings. Either the lining has absorbed oils, is hardened with age, or has a more responsive replacement friction material now available. I highly suggest a change.

On disassembly, the pivots of a 71/72 brake should be lubed with water-proof grease. Since there is no grease nipple, it's the only time you can do it.

Longer brake arms are offered for the 71/72 front brake (Norman Hyde ??) that really make that puppy stop. More lever travel needed, but much improved stopping.

Highly suggest air wrench over LocTite on the axel nut.

Don't forget to re-adjust the 2 cam screws inside the brake.

Your wife and I are having a great time on the nude beaches here in Rio. I'll post photos later.

:bigt:


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: front brake conical hub #50874
01/09/07 7:37 am
01/09/07 7:37 am
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline OP
BritBike Forum member
Ger B  Offline OP
BritBike Forum member
G

Joined: Sep 2005
Posts: 5,963
NL
Was that you, Richard? In Rio?
Lucia phoned me last night and could not stop laughing. Is it true a mini size towel is large enough for you? eek

I'm off to work now. I'll post a better reply later. :bigt:


Ger B

Re: front brake conical hub #50875
01/10/07 12:02 am
01/10/07 12:02 am
Joined: Oct 2003
Posts: 11,269
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member

Joined: Oct 2003
Posts: 11,269
North Georgia, USA
Quote
Originally posted by Ger.:
Is it true a mini size towel is large enough for you?
Actually, a matchbook cover.

laughing


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: front brake conical hub #50876
01/10/07 1:04 am
01/10/07 1:04 am
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
M
Mr Mike Offline
BritBike Forum member
Mr Mike  Offline
BritBike Forum member
M

Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
Ger,
I have a 71 conical on my B50. The bike was resurrected from boxes of rusty parts last winter. When I got to the brake, mine too was as you described. Very little physical wear with just a lot of idle years on it. I cleaned it, serviced it, installed a new cable and adjusted it. It has stopped better than most other brakes I have had in Brit bikes.

Mr Mike

PS Your Missus will know you had the bike in the living room despite all your efforts to remove all traces.

Re: front brake conical hub #50877
01/10/07 4:28 pm
01/10/07 4:28 pm
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline OP
BritBike Forum member
Ger B  Offline OP
BritBike Forum member
G

Joined: Sep 2005
Posts: 5,963
NL
Hello Mike.
My sons girlfriend came by yesterday and in the hall, front door not yet closed, she allready asked: "What do I smell..."
"Brussels sprouts", I answered, but she didn't believe me.
Women...


Ger B


Moderated by  Alan_nc 


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