KX85 front brake issues

Braaaphole
Posts
782
Joined
8/21/2016
Location
Spring, TX US
Recently bought this bike used and found that the front brakes aren't grabbing like they should. They grab and slow the bike down, but they don't grab hard and won't come close to locking up. Even rolling the bike by hand and grabbing them, the front wheel doesn't lock.
Yesterday I put on new brake pads and bled the line. Checked it and still the same. It seems like both pistons on the caliper are moving freely. I'm guessing I need to rebuild the master cylinder. I've never had this issue on a bike.
Doesn't appear to have any leaks either.

Anything else I should be looking at?
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kb228
Posts
6161
Joined
1/31/2018
Location
Mansfield, OH US
3/15/2018 1:22am
Rebuilding the master cylinder, replacing the brake line, and rebuilding the caliper would be the corrective steps for me. In that order.
Braaaphole
Posts
782
Joined
8/21/2016
Location
Spring, TX US
3/16/2018 6:38pm
It's not spongy, but not really firm either. It had some give to it, but it does firm up. You can't pull it all the way to the grip.
BenG
Posts
229
Joined
12/20/2017
Location
Denton, TX US
3/16/2018 9:14pm
Replace the brake line.

The Shop

CarlinoJoeVideo
Posts
7358
Joined
11/30/2013
Location
Portland/Los Angeles, CA US
Fantasy
2339th
3/16/2018 11:55pm
BenG wrote:
Replace the brake line.
+1
Replace the line(I use Galfer)
Rebuild master
Rebuild caliper
Braaaphole
Posts
782
Joined
8/21/2016
Location
Spring, TX US
3/18/2018 6:22pm
Rebuilding the master cylinder didn't fix it, but does seem to have helped. New brake line and caliper parts on the way. Guess the front brakes will be as fresh as it gets.
FGR01
Posts
5112
Joined
10/1/2006
Location
AZ US
Fantasy
1222nd
3/18/2018 7:18pm
Sand the rotor, rinse with brake cleaner, let it air dry and try not to touch the swept area with your fingers or get brake fluid on it.

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