Rear brakes
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Junior Member
Joined: Jun 2018
Posts: 20
1st Gear Member
Rear brakes
I am frustrated as all else. 2012 KLX250s, rear brakes we're not braking right. So I flushed them. Still not. I reversed flushed them ( someone here recommend that). Nope. I put a new brake line on, nope. What am I missing? My KLR was an easy fix. Is the cylinder or something bad? I didn't see any leakage anywhere. Did I not pump it right? Now I have no brake. I swear I did this right but it's probably something easy.
Senior Member
Joined: Aug 2009
Posts: 4,650
From: Delaware, Ohio
1st Gear Member
Bent rotor? That would push piston in making for no brakes.
Otherwise I definitely recommend getting a vacuum set up from Harbor Freight, works great if you don't draw too much vacuum and the price is low. Too much will draw air in around seals since they are designed to seal against internal pressure, not vacuum. Also allows slower draw so it doesn't suck the reservoir dry too fast. Took me a few minutes to bleed brakes when I did a caliper rebuild on my 550 and with the double disc setup on the same bike. Draw too hard and it will suck air in. Nice and easy does the trick.
Otherwise I definitely recommend getting a vacuum set up from Harbor Freight, works great if you don't draw too much vacuum and the price is low. Too much will draw air in around seals since they are designed to seal against internal pressure, not vacuum. Also allows slower draw so it doesn't suck the reservoir dry too fast. Took me a few minutes to bleed brakes when I did a caliper rebuild on my 550 and with the double disc setup on the same bike. Draw too hard and it will suck air in. Nice and easy does the trick.
Senior Member
Joined: Jul 2011
Posts: 1,728
From: Cottonwood, AZ USA
1st Gear Member
Take your pads off and push the brake by hand and see if the PISTONS are moving. If they are, that is not your problem.
Next take the pads and take a sander to them, they probably got contaminated. Before you put them back on, take isoproply alcohol and clean the rotors.
EDIT FOR CLARITY, SPELLING NOT ! THKS.
Next take the pads and take a sander to them, they probably got contaminated. Before you put them back on, take isoproply alcohol and clean the rotors.
EDIT FOR CLARITY, SPELLING NOT ! THKS.
Last edited by durielk; Jul 8, 2019 at 11:31 PM.
Senior Member
Joined: Aug 2009
Posts: 4,650
From: Delaware, Ohio
1st Gear Member
DURIELK your hands didn't keep up with your brain.. You mean the caliper piston, is it moving. And you transposed the y and l in isopropyl alcohol, but definitely good advice, especially cleaning the pads if they got any brake fluid on them. Contact cleaner will work too.
I wonder if a turkey baster filled with brake fluid could push fluid in through the caliper up to the reservoir... redneck engineering. Have to be careful not to overflow the reservoir though.
I wonder if a turkey baster filled with brake fluid could push fluid in through the caliper up to the reservoir... redneck engineering. Have to be careful not to overflow the reservoir though.
Senior Member
Joined: Mar 2013
Posts: 760
From: Young Harris, GA
1st Gear Member
When you originally started this project, you mentioned that the rear brake wasn't working right. What specifically was your symptom that suggested it wasn't working right? No stopping power or no pedal?
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