sticky calipers - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 04-23-2016, 10:11 AM Thread Starter
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sticky calipers

Mine are nearly closed up and holding the wheel tight after prying them apart and bleeding them the first time, they locked the wheel solid. What do I to to lube them or whatever is making them stick. They sat for a good while.


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post #2 of 9 (permalink) Old 04-23-2016, 11:03 AM
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Have to remove the piston and clean the bore/piston.

Can also be a collapsing hose holding pressure.

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post #3 of 9 (permalink) Old 04-23-2016, 11:33 AM
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Quote:
Originally Posted by Spockster View Post
Have to remove the piston and clean the bore/piston.

Can also be a collapsing hose holding pressure.
Good call !
.....sometimes they can collapse on the inside...not showing evidence externally.
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post #4 of 9 (permalink) Old 04-23-2016, 11:58 AM
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Good call !
.....sometimes they can collapse on the inside...not showing evidence externally.
Definitely. I've dealt with a lot of collapsing brake hoses, none could be seen, it was all internal.

Can hit the brake a few times, release the brake, then open a bleeder and see if there's pressure in the line.

I always check for this when there's a complaint about gas mileage that's not easily solved.

Seems the 1988-2000 GM pickups are having this problem a lot lately.

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post #5 of 9 (permalink) Old 04-23-2016, 01:18 PM Thread Starter
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i'll see what I can do. I bled them very well last night with new fluid and had no issues doing so. They were shooting fluid 2 feet when bleeding.


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post #6 of 9 (permalink) Old 04-23-2016, 02:01 PM
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Quote:
Originally Posted by WilliamTech View Post
Good call !
.....sometimes they can collapse on the inside...not showing evidence externally.
My cb750 is doing that now

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post #7 of 9 (permalink) Old 04-23-2016, 02:14 PM
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If its a dirty piston sometimes they can be cleaned without disassembling the whole system. Take calipers off one at a time.pull pads off and take off rubber boot.put a c clamp on caliper and leave about a half inch.press brake lever until piston hits the c clamp.you will see a line of crud.clean with pb blaster and wire brush.collapse piston with c clamp past the line of crud.repeat process until no crud.then reassemble.and repeat on other side
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post #8 of 9 (permalink) Old 04-26-2016, 07:52 AM Thread Starter
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Did exactly that. Lightly sanded one time and it worked fine.
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post #9 of 9 (permalink) Old 05-02-2016, 09:42 AM Thread Starter
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Turned out to be the return valve on the master cyl not releasing pressure. This video shows proper operation after I removed it and cleaned it.



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