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Author Topic: 1975 CB550 Front Brake Sticking  (Read 1862 times)

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Offline ddamron

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1975 CB550 Front Brake Sticking
« on: September 02, 2013, 02:09:54 PM »
Hey guys,

I'm trying to straighten out a brake problem I've got. The front caliper used to stick on this bike like crazy, so I cleaned the inner faces, put in a new seal, and bled the lines. I tried my best to do the static pad adjustment, as well.

In any case, when putting everything back together the piston went in quite nicely, the wheel spun freely after I did the adjustment, but as soon as I apply the brake and release it becomes much more difficult to move the wheel. See the video below to see how it moves one handed.

https://www.youtube.com/watch?v=vn--awNp17E&feature=youtube_gdata_player
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Offline LesterPiglet

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Re: 1975 CB550 Front Brake Sticking
« Reply #1 on: September 02, 2013, 02:30:28 PM »
Try cleaning out the TWO holes in the master cylinder. It's a common problem.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


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Offline ddamron

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Re: 1975 CB550 Front Brake Sticking
« Reply #2 on: September 02, 2013, 03:30:16 PM »
These holes?  They look clear and clean to me.

When I get the chance I'll take photos of the piston and caliper. There are imperfections on the piston, it may be worth replacing.
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Offline LesterPiglet

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Re: 1975 CB550 Front Brake Sticking
« Reply #3 on: September 02, 2013, 03:33:42 PM »
Make sure they are clean by poking them with a fine wire. I used a bit from my wire brush.
Your brake is grabbing in that video. The wheel should spin a lot easier than that.
Prolly need a new piston and seal if those MC holes are clear.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline ddamron

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Re: 1975 CB550 Front Brake Sticking
« Reply #4 on: September 02, 2013, 06:35:23 PM »
The holes were clear, but man I'm having a lot of trouble bleeding the brakes now. It's there some trick to getting the banjo bolt back on I don't know of?

Anyhow, pics of my piston and caliper.
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Offline ddamron

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Re: 1975 CB550 Front Brake Sticking
« Reply #5 on: September 02, 2013, 06:47:32 PM »
I had trouble with the attachments.  Here they are.
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Offline LesterPiglet

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Re: 1975 CB550 Front Brake Sticking
« Reply #6 on: September 03, 2013, 03:23:29 AM »
Yep, I would get a new piston. Which banjo bolt and what sort of trouble? Never had a problem with bolts not fitting.
« Last Edit: September 03, 2013, 03:25:25 AM by LesterPiglet »
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline ekpent

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Re: 1975 CB550 Front Brake Sticking
« Reply #7 on: September 03, 2013, 04:28:36 AM »
Did you use a new brake pad and did it slip in easily. Some new ones need a little fine tuning to work smoothly.
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Offline mcswny

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Re: 1975 CB550 Front Brake Sticking
« Reply #8 on: September 03, 2013, 09:31:11 AM »
I recently had the same issue, Got a new seal and a new piston (yours is even worse than mine was) You can find a good piston on ebay for $30 or so.

I also took fine grit sandpaper and really scrubbed the inside of my caliper. Got All of the gunk off, especially behind the seal. That seemed to help a lot too.

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Offline ddamron

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Re: 1975 CB550 Front Brake Sticking
« Reply #9 on: September 03, 2013, 11:06:51 AM »
Yeah I've ordered the parts. I also got new brake lines, The rubber on mine is cracking.
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