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Author Topic: Front brake lever question on a 77 CB750k  (Read 941 times)

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Offline tydeus

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Front brake lever question on a 77 CB750k
« on: June 10, 2009, 06:25:56 AM »
I've rebuilt my front master cylinder and caliper, cleaned the brake lines, and replaced the pads to improve braking performance. It is much better but it seems like the bike doesn't really start slowing until the brake lever is almost all the way in. In other words I have very little resistance on the lever until it is at least 50% pulled in.

Do I need to bleed again? Do I need to adjust the front caliper? Is this just normal for this model?

Including an image because I love my bike:
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Offline OldSchool_IsCool

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Re: Front brake lever question on a 77 CB750k
« Reply #1 on: June 10, 2009, 06:56:35 AM »
Nice looking bike!!  Let's do what we can now to keep it (and YOU) out from under the rear of a semi!

Excessive travel is likely a caliper adjustment.  Check your repair manual, but I think the inside pad needs to be .006 inches from the disk. 

Air and/or weak brake lines lead to a "spoongie" lever which could also be your issue.
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Offline Inigo Montoya

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Re: Front brake lever question on a 77 CB750k
« Reply #2 on: June 10, 2009, 06:57:58 AM »
Yup, probably air. These systems are kind of a pain. Get a speed bleeder and install that on the caliper. Otherwise a method some use to get out air is to leave the cap off and SLOWLY squeeze the lever back, do it fast and you will need to clean your ceiling! Then try the handle back and let it sit over night. I have never had to do it this way but if you have issues, it should work for you.
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Offline my78k

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Re: Front brake lever question on a 77 CB750k
« Reply #3 on: June 10, 2009, 06:58:58 AM »
2 words....Speed Bleeder!!!

I will never again own a bike without them.

Dennis
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Offline tydeus

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Re: Front brake lever question on a 77 CB750k
« Reply #4 on: June 10, 2009, 07:02:53 AM »
Speedbleeder it is! Anyone have a good source for them?

Also, does anyone here use the spin-on oil filter adapters? My oil filter bolt is trashed thanks to the use of SAE wrenches on it over the years.
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Offline my78k

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Re: Front brake lever question on a 77 CB750k
« Reply #5 on: June 10, 2009, 07:04:33 AM »
speedbleeder.com  ;)

As for the spin on's I think terryinasutralia makes them here...

Dennis
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Offline tydeus

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Re: Front brake lever question on a 77 CB750k
« Reply #6 on: June 10, 2009, 07:42:40 AM »
Which size do I order for the speedbleeder?

SB8125L?
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Offline OldSchool_IsCool

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Re: Front brake lever question on a 77 CB750k
« Reply #7 on: June 10, 2009, 07:56:51 AM »
Check the brake FAQ.  There is a chart in there for sizes.
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Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.

Offline Inigo Montoya

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Re: Front brake lever question on a 77 CB750k
« Reply #8 on: June 10, 2009, 08:06:54 AM »
What do some of you use for thread sealant?
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