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Front brake mushy #720454
12/30/17 2:59 am
12/30/17 2:59 am
Joined: Oct 2007
Posts: 271
St. Louis, MO
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Wally Balden Offline OP
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Wally Balden  Offline OP
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St. Louis, MO
Put the front brake back together on my 70 TR6C and went to connect at the lever and basically had nothing but slack. Worked with the adjuster rod on the brake cam and got it as tight as it would go. Moved the adjuster at the lever all the way out and barely had any grab. Thought maybe I was missing some type of ferrule where the cable meets the brake anchor plate. In looking at pics it looks as if my whole cam mechanism is moved forward.

I could tear into the anchor plate to make sure everything is good in there but wondering if I am missing something simple.

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Re: Front brake mushy [Re: Wally Balden] #720456
12/30/17 3:52 am
12/30/17 3:52 am
Joined: Jun 2002
Posts: 10,181
Scotland
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Stuart Offline
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Scotland
Hi Wally,

I'm not completely sure, because your top picture doesn't show enough of it, but it appears to be the wrong cable - the outer should end in a ferrule that sits in the top of the brake plate abutment(?) and the cable should be about parallel to the fork slider.

If it's a '68 cable, the inner is longer, because the abutment for the outer is about below the rear pivot and then the inner runs to the end of a lever straight down from the front pivot. If you enter "1968 triumph" into your preferred internet search engine, look at the tls front brake plates in the returned images.

Hth.

Regards,

Re: Front brake mushy [Re: Wally Balden] #720461
12/30/17 5:50 am
12/30/17 5:50 am
Joined: Sep 2011
Posts: 1,001
New Zealand
Excalibur Online content
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New Zealand
The cable is from an early twin leader or it's simply been made wrong. You have the correct lever and adjuster as I recall them.
So, reset the adjuster rod so both brake shoes touch the drum at the same time. Then get the correct length cable (or shorten yours).

Re: Front brake mushy [Re: Wally Balden] #720488
12/30/17 1:46 pm
12/30/17 1:46 pm
Joined: Aug 2017
Posts: 1
North Georgia
S
S Griffith Offline
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Posts: 1
North Georgia
You also might want to check the length of the rod between the two brake cams. Workshop spec is 6.5" in length as I recall. If it is a different dimension, then the brake shoes would be riding on the cams at a different point changing the distance from the shoe to the drum. I have a 68 T120R and I have a lot more threads showing when my rod is properly adjusted. But given 68 was the first year for the 8" TLS set up, the cam levers are different than a 70.


Regards, Steve
2018 Triumph Tiger
1968 Triumph Bonneville T120R
1967 MGB roadster
1967 MGB GT
Re: Front brake mushy [Re: Wally Balden] #720526
12/30/17 9:54 pm
12/30/17 9:54 pm
Joined: Oct 2007
Posts: 271
St. Louis, MO
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Wally Balden Offline OP
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Wally Balden  Offline OP
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St. Louis, MO
Just measured the cable. The outer part is 42". I looked up the part on eBay and they have it at outer length at 39 3/8.

Re: Front brake mushy [Re: Wally Balden] #720539
12/30/17 10:55 pm
12/30/17 10:55 pm
Joined: Aug 2001
Posts: 4,076
argyll. scotland, uk
gavin eisler Offline
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argyll. scotland, uk
The link rod look to be adjusted too short, usually some adjustment threads are showing and the op arms should be close to parallel, these look a bit knock kneed to me.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Front brake mushy [Re: Wally Balden] #720581
12/31/17 8:23 am
12/31/17 8:23 am
Joined: Jun 2002
Posts: 10,181
Scotland
S
Stuart Offline
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Stuart  Offline
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Joined: Jun 2002
Posts: 10,181
Scotland
Hi Wally,

Originally Posted by Wally Balden
Just measured the cable. The outer part is 42". I looked up the part on ebay and they have it at outer length at 39 3/8.

The length of the outer on its own isn't that important, it's the comparison with the inner length that's more important.

As I advised above, in online images of '68 Triumphs, look at the cable routing; do the same at images of '70 Triumphs. Note the completely different routing; if the cable routing on your bike looks more like a '68, a '68 cable inner is much longer in comparison to the cable outer. Also post a picture of the right-hand side of your bikes forks and wheel?

If you haven't done it already, you might want a second person to help you check the adjustment the brake arms link rod. I disconnect one end of the link rod from one brake arm; one person uses two wrenches (one on each nut) to pull both shoes against the drum at the same time, second person adjusts the the link rod so its ends are the same distance apart as the ends of the brake arms; reconnect link rod and tighten locknut. bigt

Hth.

Regards,

Re: Front brake mushy [Re: Wally Balden] #720645
12/31/17 8:51 pm
12/31/17 8:51 pm
Joined: Nov 2011
Posts: 126
Northern Ireland
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B31 Ally Offline
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Northern Ireland
Wally,
I would be trying first what Stuart has suggested, getting the two shoes to touch the drum at the same time is vitally important, then work from there. I have came across a spongy front brake on a modern trials bike once where it supposedly couldn't be sorted, turned out that the cable had snagged on something and had got the wire coil sheath stretched so that when the brake was applied the outer sheath compressed first before the brake was applied, a new cable sorted it out. Check your own cable for damage, it is not always evident though.

Re: Front brake mushy [Re: Wally Balden] #720653
12/31/17 9:49 pm
12/31/17 9:49 pm
Joined: Nov 2012
Posts: 658
Isle of Wight, UK
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koan58 Offline
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Isle of Wight, UK
It looks like you've put new cables on. Can you compare the free inner length with that of the earlier cable?

Re: Front brake mushy [Re: Stuart] #720659
12/31/17 10:38 pm
12/31/17 10:38 pm
Joined: Dec 2012
Posts: 250
seattle
T
tiumphdave Offline
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Posts: 250
seattle
Originally Posted by Stuart
Hi Wally,

[quote=Wally Balden]Just measured the cable. The outer part is 42". I looked up the part on ebay and they have it at outer length at 39 3/8.



I checked 2 choices with google (no eBay) and they were 36 & 36 3/4" outer, 45 & 44 7/8" inner. So 9 & 8 1/8" free lengths. (P/N 60-2076). Then e-bay, 2 with measurements were 38" outers and 46 & 46 1/2" inners (8 & 8 1/2" free length). So who knows? How much free length do you have? Also, did you have the shoes off, for clean-up, or replacement?

Last edited by tiumphdave; 12/31/17 10:54 pm.
Re: Front brake mushy [Re: Wally Balden] #720740
01/01/18 3:39 pm
01/01/18 3:39 pm
Joined: Oct 2007
Posts: 271
St. Louis, MO
W
Wally Balden Offline OP
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St. Louis, MO
Mine are 43" inner and close to 50 outer - and when I say "inner" I obviously mean the black covering, not the actual cable. The actual cable I am calling "outer".

Re: Front brake mushy [Re: Wally Balden] #720787
01/01/18 8:14 pm
01/01/18 8:14 pm
Joined: Jun 2002
Posts: 10,181
Scotland
S
Stuart Offline
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Stuart  Offline
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Joined: Jun 2002
Posts: 10,181
Scotland
Hi Wally

Originally Posted by Wally Balden
when I say "inner" I obviously mean the black covering, not the actual cable. The actual cable I am calling "outer".

confused

The "inner" is the wire attached to the handlebar brake lever at one end and the front brake arm at the other end.

The "outer" is the black covering with a silver-coloured ferrule at each end, into the handlebar lever adjuster at one end and the 'abutment' cast on the brake plate at the other end.

Photo. of timing side of complete forks and wheel showing the current cable routing?

Hth.

Regards,

Re: Front brake mushy [Re: Wally Balden] #720789
01/01/18 8:19 pm
01/01/18 8:19 pm
Joined: Oct 2007
Posts: 271
St. Louis, MO
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Wally Balden Offline OP
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Posts: 271
St. Louis, MO
Basically I had it backwards. I took the cable off to measure it. I will put it back on and take a complete side pic.

Re: Front brake mushy [Re: Wally Balden] #721443
01/08/18 12:14 am
01/08/18 12:14 am
Joined: Oct 2007
Posts: 271
St. Louis, MO
W
Wally Balden Offline OP
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Wally Balden  Offline OP
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Posts: 271
St. Louis, MO
One last question. I have a brake now - wheel spins and when brake is applied the wheel stops. I know how to adjust at the lever and also at the adjuster on the cable. My question - when I pull the lever it stops the front wheel, however, it releases to a point - not all the way. The wheel still stays locked unless i manually push the lever back to its original point. I know there should be some free play but it does not want to return to the original position. Am I missing an adjustment?

Re: Front brake mushy [Re: Wally Balden] #721461
01/08/18 8:49 am
01/08/18 8:49 am
Joined: Dec 2004
Posts: 9,495
Scotland
kommando Offline
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Scotland
Have you sorted out the arm length between the 2 cams, also have you took the brakeplate off and greased the shoe feet, cam shafts, checked the shoe springs are in place and are not stretched and weakened.

Re: Front brake mushy [Re: Wally Balden] #721502
01/08/18 6:45 pm
01/08/18 6:45 pm
Joined: Oct 2007
Posts: 271
St. Louis, MO
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Wally Balden Offline OP
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Joined: Oct 2007
Posts: 271
St. Louis, MO
I have played with the arm length between the 2 cams. Not sure if I am making better or worse as I adjust. I have not taken the wheel off yet - trying to avoid that if possible. Probably a good idea. Most of the components were new - shoes, springs, etc.

Re: Front brake mushy [Re: Wally Balden] #721509
01/08/18 7:54 pm
01/08/18 7:54 pm
Joined: Dec 2013
Posts: 4,294
ohio, usa
kevin roberts Offline
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Posts: 4,294
ohio, usa
sounds like excessive friction somewhere, maybe in the cam pivots or at the shoes themselves or at the external return springs. per kommando, did you lube everything when you assembled it?

Last edited by kevin roberts; 01/08/18 7:54 pm.

"Are bikes so nice as all that?" asked the mole, shyly...

"Nice? They're the only thing," said the Water Rat Solemnly, as he leaned forward on the handlebars. "Believe me, my young friend, there is nothing -- absolutely nothing -- half so much worth doing as simply messing about with bikes."
Re: Front brake mushy [Re: Wally Balden] #721521
01/08/18 9:53 pm
01/08/18 9:53 pm
Joined: Nov 2008
Posts: 2,835
Bishop, Calif.
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desco Online content
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Bishop, Calif.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: Front brake mushy [Re: Wally Balden] #721531
01/09/18 3:01 am
01/09/18 3:01 am
Joined: Oct 2007
Posts: 271
St. Louis, MO
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Wally Balden Offline OP
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Posts: 271
St. Louis, MO
I am sure I greased everything but thinking the front wheel needs to come off to make sure everything is where it should be.


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