please suggest next steps in front brake issue. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 05-27-2015, 09:54 PM Thread Starter
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please suggest next steps in front brake issue.

OK I am getting frustrated. What happens is after a short ride, the front brake locks. I have changed the fluid and bled everything. I know the fluid flows freely from the ms to both calipers. I have taken the calipers apart and cleaned them. The one on the left will compress in with light clamp pressure. The one on the right will not compress in no matter how much clamp pressure I apply. I believe this causes the pad to rub, create heat, and push the piston out further, locking the brake tight. Why can't I get the fluid to push back out of the caliper on the right side but I can on the left? I took the entire right side apart and everything is clean. Oh, by the way, when I loosen the bolt for the line, it still will not compress. When I loosen the bleeder valve, it will compress.

1995 Vulcan 750
Purchased 5/3/2015 w 10,600 miles
No mods I'm aware of

Last edited by DieselPlower; 05-27-2015 at 09:57 PM.
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post #2 of 6 (permalink) Old 05-27-2015, 10:06 PM
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Originally Posted by DieselPlower View Post
OK I am getting frustrated. What happens is after a short ride, the front brake locks. I have changed the fluid and bled everything. I know the fluid flows freely from the ms to both calipers. I have taken the calipers apart and cleaned them. The one on the left will compress in with light clamp pressure. The one on the right will not compress in no matter how much clamp pressure I apply. I believe this causes the pad to rub, create heat, and push the piston out further, locking the brake tight. Why can't I get the fluid to push back out of the caliper on the right side but I can on the left? I took the entire right side apart and everything is clean. Oh, by the way, when I loosen the bolt for the line, it still will not compress. When I loosen the bleeder valve, it will compress.
Did you check the fluid seal around the piston? A defective seal can cause your problems.

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post #3 of 6 (permalink) Old 05-27-2015, 10:51 PM
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what do the shafts that the outer pad rides on look like? If they aren't shiny they may be wedging. That is what mind did. I took them off and took 120 grit emory cloth and sanded the rods or shaft until they shined. Then I took 150 grit sandpaper until there were smooth. I went to Advance Auto Parts and got some high temp brake grease that is really sticky and put it on the bike. The first time I pushed the bike I almost dropped it as there was no resistance on moving the bike.

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post #4 of 6 (permalink) Old 05-27-2015, 11:10 PM
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Sounds like the line to that caliper is clogged up

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post #5 of 6 (permalink) Old 05-28-2015, 10:26 PM Thread Starter
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Well, it seems the tiny return hole in the master cylinder was clogged. I thought I had it cleaned out but I guess I didn't. Seems to be working fine now. Thanks for all the help.

1995 Vulcan 750
Purchased 5/3/2015 w 10,600 miles
No mods I'm aware of
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post #6 of 6 (permalink) Old 05-29-2015, 03:10 AM
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Third instance of this this season I've read about on here. Good to keep an eye out for.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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