Posted by Mike Beaty on May 31, 2007, 9:40 am
If anyone can help me, I would greatly appreciate it...
I just got a 1998 KX 125 last weekend and the front brake was spongy.
After disassembling the entire system, I found a bent brake pad. So I
go to put the thing back together and fill the system with fluid. I
have tried almost everything and I still can't get pressure to the
caliper pistons. I've tried a standard bleeding bottle, reverse
forcing fluid through the bleed screw with an oil pump, and pumping
the brakes like a madman until I couldn't take it anymore. When I
open the bleed screw, just a tiny little bit of fluid comes out. When
I attach the bleed screw to the bleeder bottle, I get an okay flow
through the hose. It takes a bunch of pumps to go through to the
bottle. I'm at the point now where I'm 90% sure there's no air in the
system. Does it sound like I need to rebuild the master cylinder? I
guess air could still be in the system though...I've gotta ride on
Saturday!
Posted by Tiago Rocha on May 31, 2007, 10:32 am
> If anyone can help me, I would greatly appreciate it...
> I just got a 1998 KX 125 last weekend and the front brake was spongy.
> After disassembling the entire system, I found a bent brake pad. So I
> go to put the thing back together and fill the system with fluid. I
> have tried almost everything and I still can't get pressure to the
> caliper pistons. I've tried a standard bleeding bottle, reverse
> forcing fluid through the bleed screw with an oil pump, and pumping
> the brakes like a madman until I couldn't take it anymore. When I
> open the bleed screw, just a tiny little bit of fluid comes out. When
> I attach the bleed screw to the bleeder bottle, I get an okay flow
> through the hose. It takes a bunch of pumps to go through to the
> bottle. I'm at the point now where I'm 90% sure there's no air in the
> system. Does it sound like I need to rebuild the master cylinder? I
> guess air could still be in the system though...I've gotta ride on
> Saturday!
Sometimes air gets trapped on the highest point on the brake fluid
hose.
It's hard to tell if master cylinder rubbers are bad, but it ain't
hard to disassemble it and check...
Have you removed the caliper pistons? There are plenty of space behind
them to air to get trapped...
-- Tiago
Posted by Tiago Rocha on May 31, 2007, 10:33 am
just to add another hint: Try bleeding on the banjo bolt that screws
the brake fluid hose into the caliper.
-- Tiago
XML Sitemap
> I just got a 1998 KX 125 last weekend and the front brake was spongy.
> After disassembling the entire system, I found a bent brake pad. So I
> go to put the thing back together and fill the system with fluid. I
> have tried almost everything and I still can't get pressure to the
> caliper pistons. I've tried a standard bleeding bottle, reverse
> forcing fluid through the bleed screw with an oil pump, and pumping
> the brakes like a madman until I couldn't take it anymore. When I
> open the bleed screw, just a tiny little bit of fluid comes out. When
> I attach the bleed screw to the bleeder bottle, I get an okay flow
> through the hose. It takes a bunch of pumps to go through to the
> bottle. I'm at the point now where I'm 90% sure there's no air in the
> system. Does it sound like I need to rebuild the master cylinder? I
> guess air could still be in the system though...I've gotta ride on
> Saturday!