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Author Topic: Rear brake adjustment  (Read 3469 times)

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Offline ev0lve

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Rear brake adjustment
« on: March 08, 2009, 12:21:43 AM »
Gonna be a stupid question but I have replaced my rear brake shoes and now there's very little room to fit the adjuster on the end of the rod. In fact I can't and if I could it would set the brake.

If I remove the arm and rotate it counter-clockwise on the splines a bit is that the proper way to get some room for adjustment in there or is there a better way?

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KingCustomCycles.com

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Re: Rear brake adjustment
« Reply #1 on: March 08, 2009, 12:28:25 AM »
There should be a punch mark and line chiseled into the brake arm and pivot.  If you align those, it would be where the factory intended it.  The arm was intended to be installed in one location originally.  If your bike has ben modified, or the shoes were manufactured out of spec.  you may have to modify.
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Offline ev0lve

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Re: Rear brake adjustment
« Reply #2 on: March 08, 2009, 12:33:13 AM »
Excellent info. Thanks! I'll take a look and see if it's been moved.
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KingCustomCycles.com

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Re: Rear brake adjustment
« Reply #3 on: March 08, 2009, 12:35:02 AM »
You need to quit smoking and shave that god awful beard! ;D
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Offline ev0lve

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Re: Rear brake adjustment
« Reply #4 on: March 08, 2009, 12:36:55 AM »
Well, the smoking at least  :D
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Offline Hush

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Re: Rear brake adjustment
« Reply #5 on: March 08, 2009, 01:35:30 AM »
Tell him to shave his ears Iggy. ;D
OK this is simple, remove the actuating arm and move it forward one or two splines, this will give you enough thread to get your adjusting nut on.
Not sure which SOHC bike you are working on but my 650 has the actuating arm pointing upwards toward the seat not down towards the road but hey i don't know what you are playing with. ;D
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Offline ev0lve

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Re: Rear brake adjustment
« Reply #6 on: March 08, 2009, 01:42:16 AM »
Shave your ears KC!

Same as I've been monkeying with the last 7 months  ::) CB750k-5. Rear worked fine when I bought it but the shoes were pretty down to the base. Just getting it all back together at this point. I hope  ;D
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Offline Hush

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Re: Rear brake adjustment
« Reply #7 on: March 08, 2009, 01:58:12 AM »
I'm just not sure if the brake arm points upward or downward?
The older bikes had them pointing downward and later for better ground clearance they put them pointing upwards, it would make a huge difference if you got this wrong is all. ;D
I'll go look for a picture of a 750.
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Offline Hush

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Re: Rear brake adjustment
« Reply #8 on: March 08, 2009, 03:25:13 AM »
Right it looks like the 750 runs the actuating arm along the bottom below the swing arm so all good, just adjust by moving the spines forward one or two and all done. ;D
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline ev0lve

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Re: Rear brake adjustment
« Reply #9 on: March 08, 2009, 10:42:51 AM »
Thanks Hush! I'm guessing when I get back out there to work on it I'll find that the PO adjusted the arm and the punch mark and line will be out of adjustment. Wish I'd taken a pic so I could know for sure as it'll be next week before I'm in the vicinity of the machine again.

I'll post back the results though!
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Offline 78CB750CAFE

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Re: Rear brake adjustment
« Reply #10 on: March 08, 2009, 10:47:17 AM »
manual says the actuator arm should be at 80-90 degrees, and or look for marks mentioned above
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Offline MCRider

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Re: Rear brake adjustment
« Reply #11 on: March 08, 2009, 10:50:38 AM »
Quote from: Iggy on March 08, 2009, 01:42:16 AM
Shave your ears KC!

Same as I've been monkeying with the last 7 months  ::) CB750k-5. Rear worked fine when I bought it but the shoes were pretty down to the base. Just getting it all back together at this point. I hope  ;D
yeah, if the shoes were really worn down to the nub, the PO may have moved the arm on the spindle to squeeze that last bit of shoe .

What I've seen is a dot made by a punch on the end of the splined spindle/cam and on the arm. These dots should line up for the arm to be on the spindle at the proper place for new shoes.
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Offline ev0lve

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Re: Rear brake adjustment
« Reply #12 on: March 21, 2009, 09:00:00 PM »
Yep, the PO was trying to get every last bit of friction he could out of the rear



Lined up the marks and it's all better now  ;D
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Offline jaknight

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Re: Rear brake adjustment
« Reply #13 on: March 21, 2009, 09:31:03 PM »
Hello Iggy,

That mark's original intention was to let you know when the brakes need to be relined.  When you press on the brake pedal and the notched marks line up or nearly line up, the pads are worn and should be replaced.

Perhaps the PO was dumb enough to move that lever. But Honda went to the very limit for the position of those marks.  You can have the marks line up, from normal wear, and still not hear metal eating metal.  After that many miles (say 30,000 to 35,000) I find it hard to believe someone is that bad off that they are going to take apart and move that lever.  New brake pads are usually somewhat oversized.

If you move the positions of the two, follow CBCAFE'S advice and keep the 80 to 90 degree reference, otherwise the brake marks will not have the proper relationship to let you know when your brake pads are wearing out.

I believe if you cannot compress that spring to get it on without the brakes actuating, a proper solution would be to grind/sand some of the brake pad material off until fitting is proper.

Just a thought. ;) ;)

~ ~ ~ jaknight ~ ~ ~
« Last Edit: March 21, 2009, 09:47:08 PM by jaknight »
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Offline ev0lve

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Re: Rear brake adjustment
« Reply #14 on: March 21, 2009, 09:45:36 PM »
Thought taken and appreciated!

Could be, really I don't know. The front brake was shot when I bought it (since rebuilt but that a whole other can of worms) and the rear was functional - 27,000 miles.

The pic is where the arm and marks were prior to my pulling it off there. Should have taken a pic of the final product but I rotated the lever so the split in the splines was in-line with the red mark in the hub (90 degrees to the ground). Leaves plenty of room for adjustment and just a few threads poking through the adjusting nut. Hopefully that's just about right.

If the main worry is being able to tell when the shoes have worn it'll be a while before I get another 30,000 miles on this one I think  ;D
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Offline jaknight

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Re: Rear brake adjustment
« Reply #15 on: March 21, 2009, 09:57:15 PM »
Glad You've
got a solution.

Please bear with me on this one.  I've got to ask you something, and I don't mean to insult your know how.

What I call the hub retainer strap that bolts from the bottom inner surface of the hub, then on the outside has a washer, then maybe a lock washer, then the nut and cotter pin........ you do know that that bolt and "strap" have to be loose before you try to adjust or replace the brake shoes?  The bolt and strap have to be tightened after your brake adjustments are done.

Just a second thought. :D

~ ~ ~ jaknight ~ ~ ~
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"THE PEN IS MIGHTIER THAN THE SWORD........
..........EXCEPT IN A SWORD FIGHT"
___________________________________________
"There is nothing new under the sun.........But there are many old things we do not know"
BIBLE ---> Basic Instructions Before Leaving Earth

Offline ev0lve

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Re: Rear brake adjustment
« Reply #16 on: March 21, 2009, 10:30:47 PM »
Quote from: jaknight on March 21, 2009, 09:57:15 PM
Glad You've
got a solution.

Please bear with me on this one.  I've got to ask you something, and I don't mean to insult your know how.

You clearly haven't visited my build thread or you would know my know how is... limited.

Quote
What I call the hub retainer strap that bolts from the bottom inner surface of the hub, then on the outside has a washer, then maybe a lock washer, then the nut and cotter pin........ you do know that that bolt and "strap" have to be loose before you try to adjust or replace the brake shoes?  The bolt and strap have to be tightened after your brake adjustments are done.

Just a second thought. :D

~ ~ ~ jaknight ~ ~ ~

Yes, although I didn't when I started today. By the time I got through though I found I couldn't get the arm in the position I wanted without removing the... brake stay? At any rate the stabilizer arm that mounts here


http://www.cmsnl.com/honda-cb750-four-k5-us_model483/partslist/F++16.html

Talking about the same thing?
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Offline jaknight

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Re: Rear brake adjustment
« Reply #17 on: March 21, 2009, 10:59:37 PM »
Yes,

You Done Good Iggy, I'm Proud Of You! ;D ;D

~ ~ ~ jaknight ~ ~ ~
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"THE PEN IS MIGHTIER THAN THE SWORD........
..........EXCEPT IN A SWORD FIGHT"
___________________________________________
"There is nothing new under the sun.........But there are many old things we do not know"
BIBLE ---> Basic Instructions Before Leaving Earth
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