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Old 04-16-2014, 08:32 PM Thread Starter
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Exclamation Brake bleed problem.

Hello all

The other day I decided it was time to get the bike out and start getting it ready for spring. The first thing on my list was bleeding the front brake. I had to get a used master cylinder off Ebay because mine was cracked the end of last season (someone who shall remain nameless hit my bike in my own driveway). Anyway, I put the new cylinder in and proceed to bleed from the MC down to both calipers. I've done this three times now and still am getting no pressure at the lever. I've also tried zip tying it down over night for two nights now also. The only time I can get any kind of pressure is by pumping the lever several times but the pressure dissipates after a few seconds of inactivity on the brake. This is my first bike and am new to working on them but have been working on my cars for years so I am fairly confident in my work/abilities.

I was wondering if anyone has any advice on what to do next or if I have overlooked something stupid. The bike is a 95 so I know there could be problems with age but I'm hoping to keep the fix as cheap as possible. I'm about to graduate from university and am strapped for cash.

Thanks everybody!!
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Old 04-16-2014, 08:57 PM
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I had the same problem, I had to buy speed bleeders on ebay for about $15... I still had no pressure, I tied the lever back for 4-5 days and got good pressure then. I went ahead and replaced the brake pads, and retied the lever back for 2 days and now all is good.

Make sure you are leaving the MC loose when tying the lever, so that air can escape.

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Old 04-16-2014, 09:32 PM
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Quote:
Originally Posted by Chris32250 View Post
I had the same problem, I had to buy speed bleeders on ebay for about $15... I still had no pressure, I tied the lever back for 4-5 days and got good pressure then. I went ahead and replaced the brake pads, and retied the lever back for 2 days and now all is good.

Make sure you are leaving the MC loose when tying the lever, so that air can escape.
With brake lever tied, I drip bled mine overnight....refilled reservoir twice.


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Old 04-16-2014, 10:08 PM
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You can take a syringe filled with fluid on a rubber hose attached to the bleeder screw and slowly force fluid back up to the MC,usually the trapped air goes with it. Make sure to keep an eye on the reservoir so it doesn't run over. Brake fluid is pretty good paint remover.




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Old 04-16-2014, 10:43 PM
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First a trekkie and now you play with syringes too?you are full of suprises, brother.
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Old 04-17-2014, 06:40 AM
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First a trekkie and now you play with syringes too?you are full of suprises, brother.
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Syringes and rubberhose, that sounds more like a junkie, but I ain't!

I forgot to tell him to be sure to make sure the hose fits tightly on the bleeder screw and to go slowly and since it is a dual disc do both sides and be sure to close the screws before you take the hose off and if you watch closely you will see the air bubbles trickle to the top of the MC. I am not sure if you have done it or not but check the small hole in the bottom of the reservoir to me sure its not clogged too. Kinda common problem. I think there are two holes IIRC. I have often thought the manifold where the one brake line splits to go to each wheel is where the air gets stuck. I learned this trick working on fork trucks where the reservoir was lower than the remote cylinders. It was the only way to get that system bled.Conventional bleeding would result in a firm pedal and five minutes later .. nothing.


Cheap tip here,If you have a bottle of gear oil with the tapered tip ,the lid usually is the same size as the brake fluid cap and you can screw it directly on the bottle of brake fluid and connect the hose to it , That way you don't have people thinking you are a junkie with clear hose and syringes in our shop




If you see it on my bike I did it
VROC#30324
92 vn750(sold)
Current ride 05 1500 Classic FI
lovin' the new scoot



Quote:
"When all is said and done,usually more is said than done" UNK
Click on one x and drag to the other to read between them.

Psalm 40:1...
XI waited patiently for the Lord; and he turned unto me, and heard my cry. X
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Old 04-17-2014, 07:08 PM
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Mighty Vac

Quote:
Originally Posted by jon13700 View Post
Hello all

The other day I decided it was time to get the bike out and start getting it ready for spring. The first thing on my list was bleeding the front brake. I had to get a used master cylinder off Ebay because mine was cracked the end of last season (someone who shall remain nameless hit my bike in my own driveway). Anyway, I put the new cylinder in and proceed to bleed from the MC down to both calipers. I've done this three times now and still am getting no pressure at the lever. I've also tried zip tying it down over night for two nights now also. The only time I can get any kind of pressure is by pumping the lever several times but the pressure dissipates after a few seconds of inactivity on the brake. This is my first bike and am new to working on them but have been working on my cars for years so I am fairly confident in my work/abilities.

I was wondering if anyone has any advice on what to do next or if I have overlooked something stupid. The bike is a 95 so I know there could be problems with age but I'm hoping to keep the fix as cheap as possible. I'm about to graduate from university and am strapped for cash.

Thanks everybody!!
I use a a brake bleeder called a mighty vac . It's basically a pump you attach to your bleeder . It will make short work of bleeding brakes. It works great cost about $30. If you have a Harbor freight they have a cheaper version.
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Old 04-17-2014, 09:08 PM
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You guys are no fun.just put a clear hose on the bleeder, open the bleeder and suck on the hose.just stop sucking on the hose before the brake fluid gets to the end.(yes this is a fake disclaimer as the owners of this forum would never call me an idiot.lol.)


Vn750.com disclaimer:we here at vn750.com do not condone or endorse the actions mentioned by the idiot who posted this.do so at your own risk.

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lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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Old 04-17-2014, 09:37 PM
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I use a a brake bleeder called a mighty vac .
Mityvac.
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Old 04-17-2014, 10:21 PM
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Quote:
Originally Posted by wmsonta View Post
Mityvac.
Here I come to suck the day...lol.sorry couldn't resist.

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Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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