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front brake travel

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front brake travel

Post  woodenhead on Mon Oct 17, 2016 7:17 pm

Hi
Having problems with my front brake on model 5 forks. The travel on the arm is so great that it is hitting the bottom of the forks.
Ive measured the drum and its a couple of thou over 5" and measuring across the new shoes it reads between 4.975 and 4.980". I've tried a different cam and its no better is it o/k to shim the end of the brake shoes or should I try and build up the cam.
Regards
Mike d.

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Shimming

Post  ariel49 on Fri Oct 28, 2016 1:17 am

woodenhead wrote:Hi
Having problems with my front brake on model 5 forks. The travel on the arm is so great that it is hitting the bottom of the forks.
Ive measured the drum and its a couple of thou over 5" and measuring across the new shoes it reads between 4.975 and 4.980". I've tried a different cam and its no better is it o/k to shim the end of the brake shoes or should I try and build up the cam.
Regards
Mike d.
I'm no expert of francis-barnetts, but this seems to be a rather simple problem. Those shoes ought to work fine, considering that the drum is only a couple of thou over 5 inches. You are certain that these are the correct brake shoes? Is the brake anchor a snug fit in the fork leg? Is the bushing for the brake cam a good fit in the brake backing plate? Is the steady pin opposite the brake cam not worn down, or loose in the backing plate? If it passes all of these criteria, then I would remove the front wheel, and put the backing plate complete with shoes and cam back on the way it would normally be, and see what happens when the brake is applied. When the brakes are applied to where the brake arm is hitting the fork end, where is the cam in its travel? If the cam has not turned very far, pull the brake lever off and move it one tooth at a time until the cam has moved enough to move the brake shoes, but not enough for the brake cam to stick in the full braking mode. Let us know your results.

ariel49

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Brake travel

Post  piston 197 on Fri Oct 28, 2016 6:22 am

More importantly is the cam operating arm the correct one, there are a variety of British Hub arms , used for different manufacturers, all basically the same , but varying in offset, curve, or straight and with the angle of the slotted hole in a variety of positions.
maybe the arm is on the wrong way round ? have you thought to take it off and turn it through 180degrees ?

JH

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Re: front brake travel

Post  woodenhead on Fri Oct 28, 2016 1:30 pm

John its the arm you supplied me with when I bought the brake plate from you.
It is the correct one as I have a spares book showing the arm and looking at it it matches the cable line perfectly.
I have since found that Villiers Services will fit custom linings if you give them the dimension over the shoes and the drum diameter, Iv'e sent mine off to be done that should solve the problem.
Regards
Mike d,

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try turning it over

Post  piston 197 on Fri Oct 28, 2016 2:15 pm

Mike,
it still might be worth trying it the other way round ? it will still be in line with the cable run, I am not suggesting pointing it the other way, just making the back edge, the front.( rotation through 180 deg, across width, not along length)
( it will only make a difference if it is one where the flats are not in line with the length )

JH

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Brake

Post  kerabo on Fri Oct 28, 2016 3:53 pm

I had about 6 pairs of FB brake shoes and some of them had a metal plate wrapped around the cam end of the shoe. This would reduce free play when adjusting.
I don't know what FB they were from but this was both 5" and 6" shoes.
Regards Ken.

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Re: front brake travel

Post  woodenhead on Sat Oct 29, 2016 12:08 pm

https://www.photobox.co.uk/my/photo?album_id=4487374752&photo_id=9413466409

If you look carefully at the picture you can see the end is cranked out so it will only fit one way round. there isn't a lot of room for movement
Regards
Mike d.

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Pictures

Post  piston 197 on Sat Oct 29, 2016 12:16 pm

Not signed up to Photobox, so cannot see your photos, but it is not the curvature I am disputing, just the position of the flats, there are so many arms that are all the same, but have the flats of the hole orientated at different angles depending on the manufacturers requirement. So if you have an arm which looks the same as the catalogue it will sit higher/lower in relation to the forks dependent on the positioning of the hole to affix it to the brake cam
JH

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Re: front brake travel

Post  woodenhead on Sun Oct 30, 2016 9:26 am


[url=https://servimg.com/view/14958460/12][img]

Managed to put the picture in this time.
Regards
Mike d.

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front brake arm

Post  piston 197 on Sun Oct 30, 2016 4:06 pm

Mike,
the one on my James cadet comp looks the same as yours and does not foul the fork ( same fork, same brake plate as yours), I will have a look closer at mine tomorrow
JH

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Re: front brake travel

Post  woodenhead on Thu Nov 03, 2016 11:53 am

Hi
Just got my brake shoes back from Villiers, perfect job very little movement to operate and plenty of adjustment left. If you have the same problem send them to Villiers see there web for information they need.
Regards
Mike d.

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Re: front brake travel

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