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Posted

Fill my new master cylinder with fluid and bleed it before installation?

I think I heard someone say that here before.:confused:

Posted

Hi, Reg,

The instructions that came with my MC said to "bench bleed" it before installation. They had a kit in the H.E.L.P. display at my local NAPA store which included all the plugs and lines to do this. Basically you put the MC in a vice, fill it with brake fluid, put one of the plugs in the outlet and attach a tube to return the fluid to the reservoir. Then you just work the pushrod a few times and the MC gets primed. Even though I did this, and I've bled the system about five times, I still think I have some air trapped in the lines somewhere. Zeke

Posted

Reggie;

I bench bled my master cylinder. Then I capped of the holes while I installed the master cylinder/pedal assembly in the car. Once installed I removed the plugs, connected the lines, and bled the system.

16s.jpg

Posted

Finally ! I have brakes again in old Pearl. Thanks for the help.

Oh.........Don, if you don't call me Reggie I won't call you Donald.:P

Posted

Yes, in point of fact, you can bleed a master cylinder with the pedal by cracking the fitting at the outlet. Most techs bench bleed master cylinders in a vise, just using their thumb as a check valve and a screw driver for a push rod. Works just fine. This is becasse it is easier and quicker to do than trying to bleed it on the vehicle, where there may be a huge air pocket in the lines that takes time to purge.

Actually, one of the neatest ways to bleed brakes is one I've never seen discussed on this forum, and that is with the use of simple gravity. If your master cylinder is the highest point in the brake system - and most newer vehicfkes have them mounted on the fire wall - you can fill the master cylinder on a new dry brake system and open just one bleeder. In a day or two, fluid will begin to weep out the bleeder into your container. Then repeat with the other wheel cylinders. I have done this several times on vehicles i was restoring, where time was not an issue. Works well, too. This is one reason why I purchased a remote reservoir for my B1B, so this method will work. JMHO

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