Master Cylinder Bleeding - Impala Tech
Brakes & Suspension Conversion Questions & more

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post #1 of 4 (permalink) Old 06-21-2012, 02:59 PM Thread Starter
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Join Date: Apr 2010
Location: Monroe NC
Posts: 1,094
Master Cylinder Bleeding

Not an Impala application but the same issue. I was having air bubbling out of the rear reservoir ( front brake circuit ) on a 90 Silverado with RWAL system.

I purchased a new master, bench bled it to the point where there was fluid motion and not arieation of fluid. I used the plugs that came with the kit and followed instructions. I bled this way for a good 30 mins. and installed this with the plugs installed.

When I installed the hard lines to bleed the system; the rear reservoir again had air again. What am I not seeing here? I've heard that masters are hard to bleed, so do I need to re-bleed the master with the "tube submerged in resevoir "style again?

Pedal is more firm but still feels like I'm compressing air. Any help?
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post #2 of 4 (permalink) Old 06-21-2012, 03:45 PM
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Join Date: Jun 2012
Location: Piedmont, SC
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I have a Power Bleeder that I have used to bleed dry systems on everything from a 69 E-Type to a motorcycle. Easy to use and always works. If you a doing your brake work alone, I highly recommend looking into one.

1969 Imapala convertible build thread here:
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post #3 of 4 (permalink) Old 06-21-2012, 07:03 PM
Join Date: Jan 2006
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I also have an air over hydraulic bleeder but before I bought that one I used a Mighty-Vac hand pump to bleed ther brakes. It works just as well only it takes just a bit longer (time is usually not an issue if you are not running a garage working flat rate) and it is a fraction of the cost (about a tenth).
Big Dave
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post #4 of 4 (permalink) Old 06-25-2012, 10:25 PM
Join Date: Apr 2012
Location: OKC
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Gravity bleeding works also if your starting out with a dry system..
Fill the master cylinder, then just open each bleeder one at a time and till fluid starts to come out.
After you have done all four, then have some get in the car and pump the brakes and hold them and then open the bleeder.
It usually take a few time to ensure all air is removed.
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