Lack of brake cable tension, LX v-brakes

Lack of brake cable tension, LX v-brakes

Post by coloma » Thu, 07 May 1998 04:00:00


I have LX V-brakes on a cyclocross frame. The problem I'm having is that
there doesn't seem to be enough tension in the brake cables becuase the
brakes don't spring back enough when I realise the brakes levers.

I'm using one of those roller-converters because I'm using road brake
levers so there's probably some added friction there.

And the brakes are set in the boss holes that would give it the greatest
tension.

I've lubed them and checked the adjustment too and even bent the LX
spring arms back for added tension.

But it's still not enough.

Any suggestions/comments???

 
 
 

Lack of brake cable tension, LX v-brakes

Post by Gene Toll » Thu, 07 May 1998 04:00:00

Quote:

> I have LX V-brakes on a cyclocross frame. The problem I'm having is that
> there doesn't seem to be enough tension in the brake cables becuase the
> brakes don't spring back enough when I realise the brakes levers.

> I'm using one of those roller-converters because I'm using road brake
> levers so there's probably some added friction there.

> And the brakes are set in the boss holes that would give it the greatest
> tension.

> I've lubed them and checked the adjustment too and even bent the LX
> spring arms back for added tension.

> But it's still not enough.

> Any suggestions/comments???

What I did with the same setup was turn the centering screws (both arms
have one, its on the outside near the bottom) until they were almost all
the way in, then backed off *slightly* to center. I have noticed that
they aren't as snappy as the V-lever/brake setup on my trail bike, but
they are close. And put the springs back in the center boss holes.

According to the latest Velonews, Jagwire is coming out with a cable
that is *much* more flexible than usual. VN comments that they'd be
ideal in V-brake applications.
--
Regards,
Gene Tolli

"Yes sir," said Zenoida, "I do prefer the dwelling of simplicity
and truth to the mansions of treachery and imposture."
Voltaire, Candid.

 
 
 

Lack of brake cable tension, LX v-brakes

Post by Mark McMaste » Thu, 07 May 1998 04:00:00

Quote:


> > I have LX V-brakes on a cyclocross frame. The problem I'm having is that
> > there doesn't seem to be enough tension in the brake cables becuase the
> > brakes don't spring back enough when I realise the brakes levers.

> > I'm using one of those roller-converters because I'm using road brake
> > levers so there's probably some added friction there.

> > And the brakes are set in the boss holes that would give it the greatest
> > tension.

> > I've lubed them and checked the adjustment too and even bent the LX
> > spring arms back for added tension.

> > But it's still not enough.

> > Any suggestions/comments???

> What I did with the same setup was turn the centering screws (both arms
> have one, its on the outside near the bottom) until they were almost all
> the way in, then backed off *slightly* to center. I have noticed that
> they aren't as snappy as the V-lever/brake setup on my trail bike, but
> they are close. And put the springs back in the center boss holes.

> According to the latest Velonews, Jagwire is coming out with a cable
> that is *much* more flexible than usual. VN comments that they'd be
> ideal in V-brake applications.

In V-brakes, the brake leverage in the caliper arms rather than the
levers, which means a smaller cable tension results in higher force at
the pads.  The flip-side is that the return springs on the caliper arms
pull with a lower force on the cable when the brakes retract, which may
be what is causing the problem.

QPB, makers of the Travel Agent roller cable-travel converter, seems to
recognize the potential cable return problem, because they have recently
begun including a more flexible high-strand-count cable with each one
(similar the Jag Wire).  By the way, QBP also sells both plain and
teflon coated high-strand cables separately, as well.

Mark McMaster