Dual Piviot brake question

Ian said:

The frame on my road bike has just been replaced under warranty and
yesterday I collected the bike from my local bike shop.

The dual pivot brakes move on the bolt fixing them to the frame/forks.
I always thought they were meant to be firmly fixed and not move. I
asked my LBS who said they are meant to move to centre the brakes as
they are pulled on. I had always centred the brakes when making any
adjustments by using the small centre adjustment screw on the brakes.

Should the brakes move on the frame fixing bolt or not?

Thanks.

Ian

No. There should be a star lock washer between the brake and the fork
to keep the brake from moving.

Ian said:

The dual pivot brakes move on the bolt fixing them to the
frame/forks.

What brakes are installed?

For those dual pivot brakes I know this would mean they are not
properly installed, a safety hazard.

--
MfG/Best regards
helmut springer panta rhei

Thanks for answers. The brakes are Tektro which came with my Giant
OCR2.

I've maintained the brakes a few times and always had them tight on
the frame/forks. But my LBS said they should move when I collecet the
bike form them. I'll check all their workmanship and contact Giant
after Easter.

Ian

In article
<[email hidden]>,

Ian said:

Thanks for answers. The brakes are Tektro which came with my Giant
OCR2.

I've maintained the brakes a few times and always had them tight on
the frame/forks. But my LBS said they should move when I collecet the
bike form them. I'll check all their workmanship and contact Giant
after Easter.

I propose that you go in there and at least tighten
the mounting nut. Maybe even remove the brakes and
inspect them.

--
Michael Press

Ian said:

Should the brakes move on the frame fixing bolt or not?

No way, the fact that they don't move around is one of the benefits of
dual pivot brakes!

--
Work and recreation are not often effected at the same time.
One using a bicycle in business makes an exception to the rule.
- Dr. Edgar H. Earl, Rochester. (~1892)

Thanks for replies. I remember when I got the bike new I had to fit an
extra washer on the main bolt as I couldnt tighten the rear brake
enough on to the frame. The LBS didn't keep this when they replaced
the brakes. I've now removed and refitted both brakes and found for
some reason they have taken the blocks off and refitted them badly
toed out and they replaced one of the cable guides/sleeves, not with a
new one but with something which is rusty inside.

I feel a letter to the manufacturer coming on.

Ian said:

The frame on my road bike has just been replaced under warranty and
yesterday I collected the bike from my local bike shop.

The dual pivot brakes move on the bolt fixing them to the frame/forks.
I always thought they were meant to be firmly fixed and not move. I
asked my LBS who said they are meant to move to centre the brakes as
they are pulled on. I had always centred the brakes when making any
adjustments by using the small centre adjustment screw on the brakes.

Should the brakes move on the frame fixing bolt or not?

Thanks.

Ian

-----------------
yes, I had the same misconception when I
first started riding. You should not
use the screw to center the brakes. The
brakes should be tight on the frame, but
not so tight that you can't center the
brakes by pushing on the brake shoes.