Front break problem, PLEASE help!
Thread Starter
|
Advanced
Joined: Mar 2014
Posts: 99
Likes: 1
From: NJ
Front break problem, PLEASE help!
Can someone help me out? I've been bleeding my brakes for forever. By hand, mity vac, a syringe from the caliper, and an air compressor attached to a vacuum bleeder and I'm still having the same problem. The front brakes get all hard but when I start moving the bike and applying pressure, it ALL goes away. Then when I'm in a certain position, some pressure is there, move a bit more, more pressure, move a but more, less pressure etc, but when I start moving without stopping, the pressure is all gone. What's the deal? No leaks anywhere, rebuilt the calipers (froze pistons) and master cylinder(just because) all 100% right. It's really ticking me off. Can someone help? My pads are good and rotors don't seem to be warped.
Road Warrior
Joined: Aug 2009
Posts: 1,889
Likes: 104
From: Mississippi
You have a bent disc or both of them are bent. Lift the front of the bike and slowly turn the front wheel while watching the disc,when the bent portion of the disc passes through the caliper you will see it push the pistons back into their bores.That is the reason you have to pump the lever to regain pressure at the master cyl.
Road Captain
Joined: Mar 2012
Posts: 637
Likes: 3
From: Iowa
Are you bleeding the brakes on the jiffy stand? If so it leaves an air pocket in the caliper because the bleeder isn't at the highest point of the caliper. Try turning the handle bars all the way to the right while on the jiffy stand, then repeat the bleeding process. It will be opposite of the way you turn the bars to lock the forks. This makes the caliper stand straight up and down. Hope it works
Road Warrior
Joined: Aug 2009
Posts: 1,889
Likes: 104
From: Mississippi
If you have bled all of the air out of the system and you lose brakes when you roll the bike,it has to be a bent rotor.
Trending Topics
6th Gear
Joined: Apr 2015
Posts: 13
Likes: 2
From: New Mexico
Seems like if a rotor were bent, you would a noticed it before you overhauled the calipurs. More likely you have bleeding problems. Try using a syringe of fluid hooked up to the bleed niple on the caliper and pump fluic uphell into the mastercyclinder. Sometimes it helps.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Road Warrior
Joined: Aug 2009
Posts: 1,889
Likes: 104
From: Mississippi
Seems like if a rotor were bent, you would a noticed it before you overhauled the calipurs. More likely you have bleeding problems. Try using a syringe of fluid hooked up to the bleed niple on the caliper and pump fluic uphell into the mastercyclinder. Sometimes it helps.
Just a thought.If it has air in the system,why is the lever firm,until the bike is rolled?But has to be pumped up after rolling,and will keep a firm lever until the bike is rolled again.
Thread Starter
|
Advanced
Joined: Mar 2014
Posts: 99
Likes: 1
From: NJ
I'm bleeding on the jack so the bike is up right. And yes I lubed the seals and pistons in the caliper just as the manual said when installing. How can I check the rotors if they are warped?