Brake block missing

As noted in my Mad Jack's RR, I lost a brake block.

This came about because I changed the blocks during the week (fitted
KoolStop Salmons) and managed to lose the retaining screw which
locates against the rear of the block. I thought it would be OK, as
the back of the shoe points upwards slightly and the block enters it
from the back.

Obviously this is not the case, but I can't see the mechanism to cause
the block to come out - the action of braking will cause the block to
go further/harder into the shoe.


Any ideas?


Tim

Any ideas?

Magpies probably.

Could it be all the vibrations from the road surface? I have to
check/replace the bolts holing the rear rack on as they have a habit of
working loose.

in message , Tim Hall
') wrote:

As noted in my Mad Jack's RR, I lost a brake block.

This came about because I changed the blocks during the week (fitted
KoolStop Salmons) and managed to lose the retaining screw which
locates against the rear of the block. I thought it would be OK, as
the back of the shoe points upwards slightly and the block enters it
from the back.

Obviously this is not the case, but I can't see the mechanism to cause
the block to come out - the action of braking will cause the block to
go further/harder into the shoe.

Any ideas?

Wheeling the bike even slightly backwards with the brake partially
applied - perhaps as you were getting on and off trains? Only needs a
couple of inches of movement.

--
(Simon Brooke) http://www.jasmine.org.uk/~simon/

;; L'etat c'est moi -- Louis XVI
;; I... we... the Government -- Tony Blair

Tim Hall wrote:
As noted in my Mad Jack's RR, I lost a brake block.

This came about because I changed the blocks during the week (fitted
KoolStop Salmons) and managed to lose the retaining screw which
locates against the rear of the block. I thought it would be OK, as
the back of the shoe points upwards slightly and the block enters it
from the back.

Obviously this is not the case, but I can't see the mechanism to cause
the block to come out - the action of braking will cause the block to
go further/harder into the shoe.

Do you not brake when reversing!? ;-)

Slightly more seriously, how about when holding the brake on when stopped
on a hill? Or: Jobst Brand's excuse for using the cheapo Continental
model is that cartridge pads can dislodge when changing a wheel, although
I don't see how myself.

~PB

On Sun, 19 Feb 2006 19:17:44 -0000, "Pete Biggs"
wrote:

Tim Hall wrote:
As noted in my Mad Jack's RR, I lost a brake block.

This came about because I changed the blocks during the week (fitted
KoolStop Salmons) and managed to lose the retaining screw which
locates against the rear of the block. I thought it would be OK, as
the back of the shoe points upwards slightly and the block enters it
from the back.

Obviously this is not the case, but I can't see the mechanism to cause
the block to come out - the action of braking will cause the block to
go further/harder into the shoe.

Do you not brake when reversing!? ;-)

Slightly more seriously, how about when holding the brake on when stopped
on a hill?


So far this seems the most likely, although I can't confirm, or
otherwise, whether I did actually hold at a junction or similar.


The good news is I've found the screw, lurking on the garage floor.


Tim

Tim Hall wrote:
As noted in my Mad Jack's RR, I lost a brake block.

This came about because I changed the blocks during the week (fitted
KoolStop Salmons) and managed to lose the retaining screw which
locates against the rear of the block. I thought it would be OK, as
the back of the shoe points upwards slightly and the block enters it
from the back.

Obviously this is not the case, but I can't see the mechanism to cause
the block to come out - the action of braking will cause the block to
go further/harder into the shoe.

Stopped on an upward slope and used the front brake?

But my first guess would be general vibration. If your brakes are like
mine, the block is quite a tight fit into the shoe, which suggests that
the block material suffers a shear force which tends to push it back out
again, particularly with vibration.

R.