Brake Bleeder Valve

[ASG]

Hello Everyone,
I recently did a brake fluid flush on my 1993 Nissan Sentra using a Motive Products Pressure Bleeder. The flush went fine, but I noticed that on the front brakes there is a slight seepage of brake fluid down where the bleeder valve is.

I tried tightening the bleeder valve, but that did not help. The seepage is coming the threaded part of the valve. It is not dripping.

My question is this, if I replace the front brake bleeder valves, will I have to bleed the entire brake system, or just the front brakes?

Thanks,

ASG

 

[HTSS_TR]

Originally Posted By: ASG

My question is this, if I replace the front brake bleeder valves, will I have to bleed the entire brake system, or just the front brakes?

Thanks,

ASG


You need to flush only the brake line(s) with bleeder valve(s) replaced.

 

[wiswind]

You might try wraping 1 layer of teflon tape onto the threads of the new bleeder screw when you install it.

 

[willix]

The bleeder seals with a wedge on the end. i If the valve seat in the caliper is pitted it will leak thread sealer won't seal it. It's not as likely that the bleeder itself is the problem. you see where the bleed hole is to divert the fluid up the center of the valve. try a new valve they are relatively cheap. Brake fluid pressures can be 800PSI. This is why you like the plastic/rubber caps on the bleeders to remain. http://www.streetsideauto.com/send_binar...&Save=False

 

[wiswind]

I have found the teflon tape to be helpful when bleeding....particularly when using a vaccum pump at the bleeder screw.
The motive pressure system should not have the issue of sucking air through the threads.
I tried only opening the bleeder screw only very slightly....and still had the issue on a vehicle.......
I now use a "one man" bleeder.....and still found that the teflon tape helped.

I agree on replacing the screw.....which is why I mentioned the teflon tape on the replacement......making bleeding easier.

 

[willix]

I understand that part of it. Also is useful to keep the threads dry in that environment for easy removal. The screw valve port leads right to the compression seal inside the bore and iron calipers rust very fast. I see folks have a tendency to over tighten bleeders for some reason. This(link) bleeder is actually a "speed bleeder" it enables bleeding to be a one man job. It has a simple check ball in it and won't draw back air. One is $10 and you only need one if you reuse the old bleeders. http://www.streetsideauto.com/send_binar...&Save=False

 

[willix]

Most calipers are mounted so the bleeder valve is at elevated to a high point at the wheel but below the reservoir. The bleeder can be replaced without it being nessesary to bleed the brakes at all. Just opening the valve is gravity bleeding that caliper, its slow but is bleeding. Stick a clear vinyl tube on the bleeder nipple and let it drape down to a pop bottle and you can watch the air bubbles rise out of the calipers. The entire system can be gravity bled with out ever touching the pedal or reservior.

 

[sw99]

http://www.speedbleeder.com/

 

[mechtech2]

Why would teflon make vacuum bleeding easier?
And leakage is harmless.

 

[rszappa1]

Has anyone used the Speedbleeders???? Good or Bad..

 

[mechtech2]

Speedbleeders can be great, but if the seal on the threads is compromised, they won't work right.
How do you know?
You don't.