Comments on: Brake Bleeding – Gravity, Manual and Vacuum Bleeding http://www.denlorstools.com/autoblog/2009/04/brake-bleeding-gravity-manual-and-vacuum-bleeding/ Automotive specialty tools, repair tips, insight from a Master Tech for DIY and professional auto technicians. Fri, 20 Nov 2009 20:49:40 -0800 http://wordpress.org/?v=2.8.5 hourly 1 By: dennisb - Auto Tool Sales http://www.denlorstools.com/autoblog/2009/04/brake-bleeding-gravity-manual-and-vacuum-bleeding/comment-page-1/#comment-1160 dennisb - Auto Tool Sales Sun, 23 Aug 2009 13:11:50 +0000 http://www.denlorstools.com/autoblog/?p=87#comment-1160 Ed, good question. There are a couple of reasons that come to mind why <a href="http://www.denlorstools.com/home/dt1/page_7445/automotive_brake_bleeding_exclusive_tech_article.html" rel="nofollow">bleeding a master cylinder</a> off the car works better in most cases. 1. Since air rises to the highest point, it's important to have the master cyl mounted level - in a bench vise, that's easier to control. On the vehicle mounted on a brake booster, sometimes they are on an angle. 2. When a m/c in placed in a vise, one person can easily push the plunger with a screwdriver and monitor the bubbles going through the <a href="http://www.denlorstools.com/home/dt1/page_5927_161/master_cylinder_bench_bleeding_kit.html" rel="nofollow">bleeding tubes</a>. Or if no bleeding tubes are used, it's easy to hold fingers over the ports. Theoretically, if the master cylinder is level, and the lines are removed, it could be bled on the vehicle. Keep in mind that even after the master cylinder has been bench bled, installed on the vehicle, it will need the brake lines cracked and bled on the vehicle (with an assistant) to remove the last bit of air. Ed, good question. There are a couple of reasons that come to mind why bleeding a master cylinder off the car works better in most cases.

1. Since air rises to the highest point, it’s important to have the master cyl mounted level – in a bench vise, that’s easier to control. On the vehicle mounted on a brake booster, sometimes they are on an angle.

2. When a m/c in placed in a vise, one person can easily push the plunger with a screwdriver and monitor the bubbles going through the bleeding tubes. Or if no bleeding tubes are used, it’s easy to hold fingers over the ports.

Theoretically, if the master cylinder is level, and the lines are removed, it could be bled on the vehicle.

Keep in mind that even after the master cylinder has been bench bled, installed on the vehicle, it will need the brake lines cracked and bled on the vehicle (with an assistant) to remove the last bit of air.

]]> By: Ed D http://www.denlorstools.com/autoblog/2009/04/brake-bleeding-gravity-manual-and-vacuum-bleeding/comment-page-1/#comment-1158 Ed D Sun, 23 Aug 2009 03:12:39 +0000 http://www.denlorstools.com/autoblog/?p=87#comment-1158 Why can't the master cyl. be bled on the car? Why can’t the master cyl. be bled on the car?

]]> By: Steve L. http://www.denlorstools.com/autoblog/2009/04/brake-bleeding-gravity-manual-and-vacuum-bleeding/comment-page-1/#comment-882 Steve L. Wed, 13 May 2009 18:42:34 +0000 http://www.denlorstools.com/autoblog/?p=87#comment-882 Don't forget about pressure bleeding! I use the Motive Power Bleeder and it works great. A true one person bleeder and very affordable also. Just my .02.... Steve L. Don’t forget about pressure bleeding! I use the Motive Power Bleeder and it works great. A true one person bleeder and very affordable also. Just my .02….

Steve L.

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