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brakes - August 3, 2010, 11:28 AM

I have absolutely no brakes (front nor rear). I bled the lines, no difference. This bike has sat unused for a few years. I'm currently tearing apart the caliper.

Any suggestions?


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August 3, 2010, 11:29 AM

Quote:
Originally Posted by EPlaw View Post
I have absolutely no brakes (front nor rear). I bled the lines, no difference. This bike has sat unused for a few years.

Any suggestions?
Start by rebuilding your master cylinders.


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August 3, 2010, 11:30 AM

^ what he said, the plunger in your master cylinder is probably bad


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August 3, 2010, 12:22 PM

yep, had the same problem on my 1980 CB650.
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GP Champ
 
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August 3, 2010, 12:46 PM

You can test the master cylinder before tearing it apart. Take a set of needle nose pliers and clamp the brake hose right outside of the master cylinder. Now squeeze the brake lever and if the master cylinder is the problem the lever will feel the same but if it's good you will be able to move the lever about an inch before it locks solid. I hope that makes since, if not I can take pictures to make it easier to understand.
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August 3, 2010, 01:10 PM

Quote:
Originally Posted by REDLEVEL View Post
You can test the master cylinder before tearing it apart. Take a set of needle nose pliers and clamp the brake hose right outside of the master cylinder. Now squeeze the brake lever and if the master cylinder is the problem the lever will feel the same but if it's good you will be able to move the lever about an inch before it locks solid. I hope that makes since, if not I can take pictures to make it easier to understand.
Pics would definite help .. trying to figure out the same thing for my bike as well .. brakes are soft and lever adjuster is on 1 and its coming to close to the handle bar upon squeezing


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August 3, 2010, 01:36 PM

Okay with the needle nose pliers squeezing the hose where pictured you would squeeze the brake lever and if the lever was still spongy you either have air in the master cylinder or it needs rebuilt. If the lever is solid then you have a problem from the hose to the calipers or the calipers themselves. This test can't be performed if you have stainless still lines. Make since?
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August 4, 2010, 11:55 AM

Quote:
Originally Posted by REDLEVEL View Post
Okay with the needle nose pliers squeezing the hose where pictured you would squeeze the brake lever and if the lever was still spongy you either have air in the master cylinder or it needs rebuilt. If the lever is solid then you have a problem from the hose to the calipers or the calipers themselves. This test can't be performed if you have stainless still lines. Make since?


Thanks for that pic man!!

Ok, so... I bled the lines and pinched the cable and had pressure. So that means it's in the caliper?... Took apart the caliper and the 4 little circle things in there were stuck closed. Banged them to the fully open position and going to test that out.

Am I doing right?


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August 4, 2010, 12:04 PM

You need to clean those four circle things. They are pistons that resemble cups that press the pads out against the rotor when you increase pressure down the line by pulling on the lever.


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August 4, 2010, 12:20 PM

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You need to clean those four circle things. They are pistons that resemble cups that press the pads out against the rotor when you increase pressure down the line by pulling on the lever.
I sprayed them with brake cleaner, prior I soaked them (the whole caliper) in carb cleaner. Then they were hammered open. I did this all prior to heading to work, didn't have time to test them.

After these mamajama's are operational my bike will be back in working order. It's been a long time coming.


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August 4, 2010, 02:51 PM

If you pulled the calipers apart and soaked them you really should replace the rubber seals. The caliper pistons should also be cleaned with some emory cloth or some really fine grit sand paper. You want a nice cross hatch in the pistons before reassembly.
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August 4, 2010, 03:23 PM

Quote:
Originally Posted by REDLEVEL View Post
If you pulled the calipers apart and soaked them you really should replace the rubber seals. The caliper pistons should also be cleaned with some emory cloth or some really fine grit sand paper. You want a nice cross hatch in the pistons before reassembly.
Why are you fuckin' with me


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August 4, 2010, 03:45 PM

Quote:
Originally Posted by REDLEVEL View Post
If you pulled the calipers apart and soaked them you really should replace the rubber seals. The caliper pistons should also be cleaned with some emory cloth or some really fine grit sand paper. You want a nice cross hatch in the pistons before reassembly.

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Why are you fuckin' with me
He's not. You probably destroyed the rubber seals by soaking them in carb cleaner. In order to get the caliper pistons cleaned up really good, you use really fine sand paper to get them smooth. If you do'nt replace the rubber seals (rebuilding the caliper), dirt and grime will get into the pistons and youre pistons will be stuck (also known as a stuck caliper).
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August 4, 2010, 04:18 PM

Thanks guys!!


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August 4, 2010, 04:46 PM

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Why are you fuckin' with me
Lol... Why do you think I was fucking with you? I have been a motorcycle tech for 10+ years so if I make a suggestion it's for a good reason.
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