Just removed all OEM rear brake setup and installed new lines and master cylinder on my Streetbob(up front on forwards), tried to bleed but am getting no pressure at all. At first I pumped and cracked the valve and got a little fluid but most sucked back in as I was doing it myself and let go of the pedal too early. Anyway nothing seems to be happening now, I can pump the pedal all day but no pressure build up. I am supposed to have the lid off the master cylinder arn't I ??. Anyone know what I might be doing wrong.

 

Hah ... Gibby you again! [J/K]

Did you do a search on the subject? I think there are some threads that walk you through it ....

You close the system up (i.e., put the top on the master cylinder reservoir). Then open the bleed valve on the caliper (put your collector tube on the valve to collect any discharge). Depress the brake pedal to force the air out of the valve. With the brake still depressed, tighten the bleed valve to close the system. Release the brake pedal and pump it a couple of times. Open the reservoir and add fluid if necessary.

Repeat the process as needed. A couple two or three times should be enough depending on how much air is in your line. If there are problems, check all your connections to ensure they're torqued down and holding airtight.

Once I followed that procedure, my brakes were solid and have been great for about 10,000 miles.

R/
Priest

 

If you want to make it easy for yourself, get a pair of Speed Bleeders for your bike. http://www.speedbleeder.com/

 

Thanks guys, I was going to PM you Preisty but I thought I'd hassled you enough, but I have done what you said already ie lid secured ect and I cant get any pressure at all, I checked all connections and everything is tight, at a loss. I wonder if it could be a faulty master ??

 

The easiest way I have found to do it is to use a 30.00 vacuum pump. I got one from a local auto parts chain. Makes it a one man job and take less than five minutes.

Once you pressure up the pump, hook the clear hose to your bleeder, crack the bleeder. The pump pulls fluid through the line until all air is gone. Tighten bleeder and you're good to go.

 

Sounds like a problem with the Master Cylinder - seals perhaps. loosen the line at master, pump to see if you get fluid there. if not the problem is the master.

good luck with it

 

X2 on the vaccum pump. I have one called might-vac or some such thing, it's a little hand vacuum pump. Fill up your master cylinder (I don't think you need to put the cover on, 'cause you're going to need to top it off.... I didn't when I did mine anyway).
Install the line from the pump to your bleeder, crack the bleeder open and pump away till you get fluid out with no bubbles (monitor your master cylinder fluid level) -close bleeder. At that point, top off the master cylinder, and do the standard "press pedal - crack bleeder open, close bleeder, release pedal" routine a few times to build your pressure.

 

vacume pump you will be done in 15 min... if not you will be there all day

 

+1 I have them and they work great.

 

+1 on the speed bleeders. I just did mine last night. About 7 minutes and I was done.