Topic: '75 CB750 brake pedal depresses too far

[Jayelwin]

So I'm a little stumped. I've completely rebuilt the entire rear wheel, new spokes, new rims, all new bearings, same brake assembly but new shoes. It's all mounted up properly linkaged to the brake pedal. And it works fine except the brake pedal has too much downward travel. I've tried to adjust the curved faced nut at the end of the linkage to the point at which the rear brake starts to engage. I'm still let with too much travel. You really have to tilt your foot down to max it out. How do you get less pedal travel to move the rear lever the proper amount?

Thanks.

[Schnell]

"I've tried to adjust the curved faced nut at the end of the linkage to the point at which the rear brake starts to engage. I'm still let with too much travel."

If this is the case, then the cam of the brake arm isn't properly engaging the brake shoes. I'm guessing it's not assembled properly.

[Schnell]

Maybe it's part #5 not oriented properly?

[Stev-o]

If this is the case, then the cam of the brake arm isn't properly engaging the brake shoes.

+1. Pull the rear brake arm off the rear brake cam and rotate it counter clockwise 1-2" and reinstall. Look here for brake part names...

http://www.hondabikes.com/fiche_section_detail.asp?section=2560117&category=Motorcycles&make=Honda&year=1974&fveh=132838

[Jayelwin]

Maybe it's part #5 not oriented properly?

That part is symmetric and the shoes fit in well. so 180 degrees wouldn't help.

[Jayelwin]

If this is the case, then the cam of the brake arm isn't properly engaging the brake shoes.

+1. Pull the rear brake arm off the rear brake cam and rotate it counter clockwise 1-2" and reinstall. Look here for brake part names...

http://www.hondabikes.com/fiche_section_detail.asp?section=2560117&category=Motorcycles&make=Honda&year=1974&fveh=132838

Makes sense but isn't that the same as tightening the nut - it just brings the rear brake lever further towards engaging. Any closer and the rear wheel will have resistance all the time.

[Johnie]

Take a look at the cam (#5) and brake arm (#7). Where they meet is a dimple in each part to orientate them. Did you check to be sure the 2 dimples line up? There are the same dimples in the brake pedal. Line them up...at least that is one thing you can check and rule out.

[ekpent]

Did you have the swing arm off ? There is a famous issue on getting the brake pedal assembly on orientated correctly in conjunction with the swing arm. I have corrected it without taking the swing arm back off but the shocks have to be unbolted, rear wheel off etc to fix and clearances are close. Look down where the pedal and rod  etc work and snap a pic.  May not be a spline shaft problem. Part #14 has to be oriented correctly around the swingarm and its other pieces to work correctly. Did you have the swingarm off--Whoops repeating   .

[grasscutter]

Take a look at the cam (#5) and brake arm (#7). Where they meet is a dimple in each part to orientate them. Did you check to be sure the 2 dimples line up? There are the same dimples in the brake pedal. Line them up...at least that is one thing you can check and rule out.

+1.

And if that still doesn't work.  You can move it 'passed' the dimple. 
This is usually done to compensate as the shoes wear down. 

[Jayelwin]

Did you have the swing arm off ? There is a famous issue on getting the brake pedal assembly on orientated correctly in conjunction with the swing arm. I have corrected it without taking the swing arm back off but the shocks have to be unbolted, rear wheel off etc to fix and clearances are close. Look down where the pedal and rod  etc work and snap a pic.  May not be a spline shaft problem. Part #14 has to be oriented correctly around the swingarm and its other pieces to work correctly. Did you have the swingarm off--Whoops repeating   .

I did have the swing arm off and I did put the spline shaft on wrong! But that was painfully obvious at the time - it pushes instead of pulls the lever arm. That was a bear to swap back with the swing arm out but I did it. This is oriented properly it just has too much travel.

I'll see about the cam thing.

[Schnell]

It's basic mechanics/physics in there. I'm sure you'll be able to find and fix a simple problem.

[flybox1]

Remove #12
Slide #7 off of #5 and rotate it clockwise on #5 by 10-15 degrees
Reinstall #7 onto #5
Reinstall #12, and turn it to achieve the desired brake pressure.

[madmtnmotors]

Really need pitchurs.... 

[Jayelwin]

Fly box solved it. Thanks. The pedal and the arm needed to be shifted a few "teeth" over. I had to remove the right driver footpeg in order to do it properly.


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