How Do I Bench Bleed The Master Cylinder - The 1947 - Present Chevrolet & GMC Truck Message Board Network

myoldchevytruck · 08-07-2008, 08:59 AM

In my quest to swap from front drums to disks and after changing master cylinder, How Do I Bench Bleed The Master Cylinder? Thanks.

PanelDeland · 08-07-2008, 11:15 AM

If the Master did not come with the bench bleeding kit you will need one.(a couple bucks at almost any parts store).Then you clamp the MC in a vice and plumb the hoses from the outlet ports on the MC back into the resevoir.Keep the hoses below the fluid level.Fill the reservior with fluid.Then using a long screwdriver or rod of some sort,pump the MC.Make sure you keep the level above the ends of the hoses.When you have just about exhausted your arm and there are no more bubbles coming from the hoses(should be easy to spot under the fluid,the MC is bled.Then install the cover and MC.Remove the bleeder kit one hose at a time and plumb to your brake lines.Then bleed the brakes.If you have fitting issues(some MC have different size ports,you can get adapters at NAPA.
You can bleed the MC after it's installled but you will need to use the kit and pump the pedal.I find that I have a hard time getting a full stroke on the MC and it takes longer.
Someone may have a better way and hopefully they will post.

jkaylor68gmc · 08-07-2008, 11:23 AM

He is spot on with that, fine job Panel Deland!

myoldchevytruck · 08-07-2008, 11:24 AM

Thanks. I'll go to AutoZone and p/u that kit.

hdflstf · 08-07-2008, 02:54 PM

You can also do it by just plugging the ports. A bit more work but the same result. Also, the factory shop manual says you need to this level, front tilted a bit down, and front tilted a bit up to be sure to get all the bubbles out.

08-07-2008, 08:59 AM	#1
myoldchevytruck Retired Air Force Veteran Join Date: Aug 2007 Location: Pembroke Pines, Florida 33024 Posts: 1,808	How Do I Bench Bleed The Master Cylinder In my quest to swap from front drums to disks and after changing master cylinder, How Do I Bench Bleed The Master Cylinder? Thanks. __________________ Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors

08-07-2008, 11:15 AM	#2
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: How Do I Bench Bleed The Master Cylinder If the Master did not come with the bench bleeding kit you will need one.(a couple bucks at almost any parts store).Then you clamp the MC in a vice and plumb the hoses from the outlet ports on the MC back into the resevoir.Keep the hoses below the fluid level.Fill the reservior with fluid.Then using a long screwdriver or rod of some sort,pump the MC.Make sure you keep the level above the ends of the hoses.When you have just about exhausted your arm and there are no more bubbles coming from the hoses(should be easy to spot under the fluid,the MC is bled.Then install the cover and MC.Remove the bleeder kit one hose at a time and plumb to your brake lines.Then bleed the brakes.If you have fitting issues(some MC have different size ports,you can get adapters at NAPA. You can bleed the MC after it's installled but you will need to use the kit and pump the pedal.I find that I have a hard time getting a full stroke on the MC and it takes longer. Someone may have a better way and hopefully they will post. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

08-07-2008, 11:23 AM	#3
jkaylor68gmc Senior Member Join Date: Dec 2005 Location: TN Posts: 2,448	Re: How Do I Bench Bleed The Master Cylinder He is spot on with that, fine job Panel Deland! __________________ 1947 International KB-1 1957 Chevy Bel-Air riding low 1962 swb fleetside 2002 Chevrolet Silverado 7-inch lift on 35 Daily driver 2016 Chevy Tahoe Better halves ride

08-07-2008, 11:24 AM	#4
myoldchevytruck Retired Air Force Veteran Join Date: Aug 2007 Location: Pembroke Pines, Florida 33024 Posts: 1,808	Re: How Do I Bench Bleed The Master Cylinder Thanks. I'll go to AutoZone and p/u that kit. __________________ Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors

08-07-2008, 02:54 PM	#5
hdflstf Registered User Join Date: Oct 2007 Location: Desert Southwest Posts: 540	Re: How Do I Bench Bleed The Master Cylinder You can also do it by just plugging the ports. A bit more work but the same result. Also, the factory shop manual says you need to this level, front tilted a bit down, and front tilted a bit up to be sure to get all the bubbles out.

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