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Sonora Auto Brake Help Requested

Posted: Thu Sep 05, 2024 9:19 am
by Dave D
IMG_6963.JPG
I have this Sonora brake that was missing the extension spring. I have fitted a new one to it, and it sort of works. If I push the lever on the right side in an upward direction, the brake trips, If I push the red rubber stop pad to the left, it resets. However, nothing happens when I pull the lever on the left side downward. What am I not understanding? It seems so simple...
Thanks!
Dave D

Re: Sonora Auto Brake Help Requested

Posted: Thu Sep 05, 2024 10:26 am
by Inigo
Could it be that there is something broken where I have added the red mark?
Screenshot_2024-09-05-16-24-43-34_40deb401b9ffe8e1df2f1cc5ba480b12.jpg
It seem like it should open and reload the brake when you turn the left lever downwards... moving the red rubber foot to the left.

Re: Sonora Auto Brake Help Requested

Posted: Thu Sep 05, 2024 11:13 am
by Dave D
Inigio,
I think you might be right. I looked at it carefully and it does appear that something is broken.
Dave

Re: Sonora Auto Brake Help Requested

Posted: Thu Sep 05, 2024 11:40 am
by JerryVan
In the area indicated by Inigo, it appears that there should be a bent-over tab on the end of the long linkage piece. Such a tab, or "finger", would presumably catch & pull on the brake arm to reset it.

Re: Sonora Auto Brake Help Requested

Posted: Thu Sep 05, 2024 2:52 pm
by Dave D
Jerry and Inigo are correct that a tab is broken off. I wonder if I could braze a glob on there and then file it to work?
I don't have a lot of experience with brazing, but it might work.
Dave

Re: Sonora Auto Brake Help Requested

Posted: Thu Sep 05, 2024 3:33 pm
by JerryVan

Re: Sonora Auto Brake Help Requested

Posted: Fri Sep 06, 2024 8:13 pm
by Dave D
Jerry! I looked all over on Ebay hoping to find one like this. I can't believe I missed this. It definitely shows what mine is missing. Thank you!
Dave