Author Topic: CB750F1 - Fixing a frozen foot brake  (Read 3070 times)

0 Members and 1 Guest are viewing this topic.

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 10,313
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
CB750F1 - Fixing a frozen foot brake
« on: March 07, 2010, 10:14:08 pm »
I discovered the brake pedal was 100% solid, like a footpeg, thought maybe it was rusted up? So, soaked it in penetrating oil 3 days, then acetone & ATF 2 weeks, beat on it until I had to fix the splines again, not a hint of rotation. Heated the casting: nothing. Tried drilling into the body so as to add a hole for oil and/or later a grease zerk: could not drill to the shaft, hit something real hard.

What to do?  ???

Went to my friendly local 100 ton hydraulic press, presuming it would destroy the casting, closed my eyes and pressed the button, and the pedal shaft with its captured steel sleeve slid slowly out of the casting intact.  :o  It was completely rusted onto the shaft, being steel-on-steel (like the current Honda swingarm bushings and their collars  >:( ) with no way of lubing it unless you annually remove the pedal and grease it yourself. Sheesh!

So, I cut away the old sleeve, made new bronze bushings (dimensions shown in the pictures below) and pressed those in, tapped the pilot hole I had tried for a grease zerk, then spun the pedal shaft and polished the rust off until it fit the installed bushings with 0.001" clearance. Works perfectly, and with a grease fitting, will outlast the engine!
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 10,313
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: CB750F1 - Fixing a frozen foot brake
« Reply #1 on: March 07, 2010, 10:16:18 pm »
Next pix:
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 10,313
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: CB750F1 - Fixing a frozen foot brake
« Reply #2 on: March 07, 2010, 10:18:31 pm »
Now I have an extra set of bushings, if someone needs them or wants their pedal rebuilt, too. I cut two sets, just in case, while I was doing this...  :)
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline mystic_1

  • Really Old Timer ...
  • *******
  • Posts: 6,071
  • 1970 CB750K
Re: CB750F1 - Fixing a frozen foot brake
« Reply #3 on: March 07, 2010, 10:44:09 pm »
I saw your tip in your book about adding a zerk to the brake pivot on K model bikes, now I have to do it to mine :)  Never would have thought of it but it seems so obvious now.

mystic_1

"A ship in harbor is safe, but that is not what ships are built for."
- John Augustus Shedd

My build thread:  http://forums.sohc4.net/index.php?topic=68952.0