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Old 03-11-2003, 06:31 PM
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Talking Bench Bleed MC

I put a rebuild kit in a single chamber master cylinder for a 1948 Chevy pickup. Do you have to bench bleed these units like a modern two chamber unit? I worked in a gas station when I was in high school and I do not remember ever bench bleeding a master cylinder But I have slept since then...A lot....DAVE

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Old 03-11-2003, 08:16 PM
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Yes, you do want to bench blead the master cylinder for 2 reasons. 1. To get the air out of the master cylinder so you can blead your brakes faster, 2. to check the master cylinder to be sure its air free, and is working properly before you put it in the car. I have seen plenty of rebuilt master cylinders that would not blead themselves of air and had to take them back for a replacement. I hope the bore was good (no pits) and you honed it out before you installed the seals or the master cylinder will not last more than 6 months to a year in most cases.
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Old 03-12-2003, 08:44 AM
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HEY HOT ROD: Thanks for your post. I will bench bleed it tonight. I was amazed at how clean the bore was but I did hone it out. I have a drum brake residual valve left over from streetrod project, do you think it might be helpful to add to 48 pickup? The master cylinder is mounted under floor, lower than wheel clyinders. THANKS DAVE
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Old 03-12-2003, 10:30 AM
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Might check ECI's site.

<a href="http://www.ecihotrodbrakes.com/images/pic04_brakefacts.gif" target="_blank">http://www.ecihotrodbrakes.com/images/pic04_brakefacts.gif</a>

Good luck, r
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Old 03-12-2003, 08:17 PM
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I would definatly use the residual valve if the master cylinder is at or below the level of your wheels. I built a street rod years ago without the residual valves and had problems with air creaping into the system. Added the residual valves and the problem was solved. Mount the residual valve as close to the master cylinder as you can.
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