Author Topic: blasted brakes!.... rear ones that is  (Read 1564 times)

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Offline the technological J

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blasted brakes!.... rear ones that is
« on: March 30, 2012, 10:08:08 PM »
i took off my back wheel with working brakes and cant get the  brakes to work properly now...   it seems that no matter how far i pull ahead the brake pedal.. i cant get the brake to engage...  the spline im going to call it or the actuator what ever you call the part that  the linkage hooks onto on the wheel (that twists and causes the shoes to press the drums) it twists from 12 o clock to 11 before it works

here is the open setting or the 12 o clock





here is the braking or actuated position.. (11 o clock)


 im at a loss to get this thing to work propperly.... ive tightened the stupid adjuster the whole way in and still cant get the rear drum to work

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72 750 K2 Stay tuned!

Offline HondaMan

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Re: blasted brakes!.... rear ones that is
« Reply #1 on: March 30, 2012, 10:55:43 PM »
From the picture, the spline shaft looks to not be fitted all the way into the brake actuator arm(?). It should be flush to the outside of the arm when installed. If not, it will twist and not turn the splined shaft very much - and it can then damage the splines if only tightened on 1/2 of the arm.

Also, is the brake stay arm properly located and tightened?
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Offline the technological J

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Re: blasted brakes!.... rear ones that is
« Reply #2 on: March 31, 2012, 07:02:26 AM »
the brake stay arm is propperly mounted and i had the arm(brake actuator) on and off so much, i slipped it on for the demo pic.. it almost seems as if the brake lever pull bar is too long ...(not hooked up in the pic.. the threaded adjuster)(sorry trying real hard not to use the word thingy) or the  brake stay arm is too short
70 KO...sold to fund the ST http://forums.sohc4.net/index.php?topic=88800.0(Alpha)
74 Kaw 250 Enduro http://forums.sohc4.net/index.php?topic=124278.0
K4 added to collection! http://forums.sohc4.net/index.php?topic=104784.0
78 750K... http://forums.sohc4.net/index.php?topic=60257.0 (Omega)sold to fund the K4
94 ST1100..Gone
72 750 K2 Stay tuned!

Offline Don R

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Re: blasted brakes!.... rear ones that is
« Reply #3 on: March 31, 2012, 07:53:50 AM »
Did you have the brake pedal assembly apart?
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Offline SohRon

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Re: blasted brakes!.... rear ones that is
« Reply #4 on: March 31, 2012, 08:19:31 AM »
Quote
it almost seems as if the brake lever pull bar is too long ...(not hooked up in the pic.. the threaded adjuster)(sorry trying real hard not to use the word thingy) or the  brake stay arm is too short

If it was working properly before, it should now; none of the parts shrank or grew while it was apart, so the only answer left is improper installation. I'd wonder if the lever is correctly installed. There's a wide gap at the top that corresponds to a notch in the brake actuator stud, make sure that is correctly oriented, and that the lever is installed completely, as HondaMan said. Make sure the brake stay is attached at the swingarm and at the hub. With these correctly installed, the only other possibility is incorrectly installed brake shoes, or the shoes themselves are worn farther than you realized. This is such a simple system that there are really only one or two things that can go wrong.




Also, make sure the pull rod is oriented correctly at the brake lever




Good luck!
« Last Edit: March 31, 2012, 09:52:17 AM by SohRon »
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Offline MCRider

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Re: blasted brakes!.... rear ones that is
« Reply #5 on: March 31, 2012, 11:52:11 AM »
I think that Techno has a 750 v SohRon's 500? The brake pedal pivot arm goes IN FRONT of the swingarm tube on the 750. Looks like its behind on the 500.

Anyway, Techno, back it up. How much of the brake did you have off? Did you remove the pedal and the pivot arm that pulls the actuator rod?

Tecno: on that arm in your picture, there is an index dot that lines up with a dot on the cam with the splines the arm is pushed onto. Foolproof. BUT, if your shoes are really worn, you'll need to fudgeit and turn the arm back on the cam. This isn't cricket and hard to do because of the splines. Maybe a PO did this to you, and you didn't notice when you disassembled?

I had to grind some splines off mine. I'd had the shoes "radiused" by RaceTech and they removed so much material that's the only way i could get it to engage in the proper range.
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Offline SohRon

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Re: blasted brakes!.... rear ones that is
« Reply #6 on: March 31, 2012, 07:52:04 PM »
Quote
I think that Techno has a 750 v SohRon's 500? The brake pedal pivot arm goes IN FRONT of the swingarm tube on the 750. Looks like its behind on the 500

Oops! Didn't notice that... Sorry about the confusion!

Carry on...
"He slipped back down the alley with some roly-poly little bat-faced girl..."

Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline the technological J

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Re: blasted brakes!.... rear ones that is
« Reply #7 on: April 01, 2012, 02:05:04 PM »
Quote
I think that Techno has a 750 v SohRon's 500? The brake pedal pivot arm goes IN FRONT of the swingarm tube on the 750. Looks like its behind on the 500

Oops! Didn't notice that... Sorry about the confusion!

Carry on...
i think that my spring placement might be wrong...might be the root of the prob..i had a heck of a time last time getting it to work...so I bet that has a bit to do with it
70 KO...sold to fund the ST http://forums.sohc4.net/index.php?topic=88800.0(Alpha)
74 Kaw 250 Enduro http://forums.sohc4.net/index.php?topic=124278.0
K4 added to collection! http://forums.sohc4.net/index.php?topic=104784.0
78 750K... http://forums.sohc4.net/index.php?topic=60257.0 (Omega)sold to fund the K4
94 ST1100..Gone
72 750 K2 Stay tuned!