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Ferris Leets
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« on: August 10, 2009, 06:29:54 AM » |
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I have no idea why the guy tried this or why it works but, it does.
If your brakes are a little mushy after bleeding clamp the brake lever or pedal in the on position overnight.
I did this on the Nomad even though the brakes felt fine. It made them even better. Last night I changed out the fluid on the Valk, looked liked it was the original fluid came out like weak coffee. When I got done the front felt a litlle squashy so I clamped it overnight. No squashy this morning.
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Joe Hummer
Member
Posts: 1645
VRCC #25677 VRCC Missouri State Representative
Arnold, MO
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« Reply #1 on: August 10, 2009, 07:09:47 AM » |
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I did the same by stroking the calipers a couple of times. I guess I had a couple of little air pockets in there that I was able to work out.
Wonder if that works with the clutch too.
Joe
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1999 Valkyrie Interstate
You pay for the whole bike, why not use it Jerry Motorman Palladino
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R J
Member
Posts: 13380
DS-0009 ...... # 173
Des Moines, IA
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« Reply #2 on: August 10, 2009, 07:29:02 AM » |
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When you replace pads you have to push the caliper pistons back inside the caliper.
When you are done you have to pump the brake lever or foot pedal about 6 times to establish a solid pedal.
What he is gaining from his procedure I have no idea. Been doing brakes for many years and never heard this wives tale before.
Also a Mighty-Vac comes in handy and doesn't allow air in, AS LONG as ya keep the reservoir full in the process.
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44 Harley ServiCar   |
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KCvalk
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« Reply #3 on: August 10, 2009, 07:32:10 AM » |
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i found that if you tap the brake lines with a screwdriver in various places from the caliper up to the master cyl,
It seems to dislodge any air bubbles that may have attached themselves to the side of the hose. Leaving the system "open" for 24 hours allows the air bubbles to go north and escape the lines. Really does make a difference. Good call!
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the armor of the Valkyries "sheds a strange flickering light, which flashes up over the northern skies" making the aurora.
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Ricky-D
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« Reply #4 on: August 10, 2009, 07:47:44 AM » |
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Ferris, if the brakes feel mushy after bleeding it would seem to me that there is an error in technique.
Somehow there is air entering in a system that heretofore had no air.
Changing fluid is an easy thing. Use a syringe to empty the reservoir. Do not pour out the reservoir and keep the reservoir level. No air will "force" it's way into the assembly using this technique.
No criticism here.
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2000_Valkyrie_Interstate
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Ferris Leets
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« Reply #5 on: August 10, 2009, 08:58:45 AM » |
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I guess I am just not making myself clear. I am talking about brakes that work but have a slight compression at the end of the stroke. You get the same feel from non metallic brake lines. Just a less solid feel. If hydraulic brakes are completely air free and have steel lines when you reach full compression it is like stepping on a rock. What I am describing would be more like stepping on thin carpet.
I do not know why but leaving the brake on overnight takes that last little bit of play out. I never even realized the Nomad had it until I put on stainless lines and later did this. Then they were rock solid.
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John U.
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« Reply #6 on: August 10, 2009, 09:03:54 AM » |
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It could be that by clamping the lever/pedal you are stretching the flexible brake line and taking some of the flex out of it. Yoo much clamping pressure might shorten it's life.
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Ferris Leets
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« Reply #7 on: August 10, 2009, 09:08:21 AM » |
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It was more noticeable on the Galfer brake lines.
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Bone
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« Reply #8 on: August 10, 2009, 09:49:13 AM » |
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Tying the brake lever is an old trick. I've seen it in a few bike shops. Shop rags to bungee cords around the lever. The air if any finds it's way to the top of the system.
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Ricky-D
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« Reply #9 on: August 10, 2009, 10:09:37 AM » |
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True! Air can find it's way out if the air is close to the top and the system allows it to travel up to the m/c.
Stretching brake lines are fiction. Period. I know this will start a riot! However it could happen from a damaged brake line.
If you feel a cushioned stop at the extent of travel it can be caused by many things. Air in the line being the most obvious reason.
Other reasons can be a misaligned caliper and/or pistons, a frozen piston, badly wearing brake pads, separation of the brake pad from the base metal, a softer than realized brake pad material, a breaking or broken caliper. a badly worn rotor, a bent rotor, a problem in the master cylinder. The list goes on and on.
I think sintered pads give you the hardest feel while organic pads are much more cushy. Sintered pads stop more powerfully and wear out the rotors quickly while organic pads are much more gentle on the rotors.
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2000_Valkyrie_Interstate
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Ferris Leets
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« Reply #10 on: August 10, 2009, 10:39:53 AM » |
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<"Stretching brake lines are fiction. Period. I know this will start a riot! However it could happen from a damaged brake line."> Ricky D
We will just have to disagree on that one.
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