Can you use a brake bleeder tool to bleed the master cylinder while it is still on the vehicle?How would you do it?I know i can do the calibers with one and plan to but i have read to do a brake bleed correctly you should do the mc first before going to the calibers.

Check master cylinder level......needs to be fullThen starting at the brake farthest away from MC bleed brake fluid thru it.If you have a vacuum pump........follow directions that came with that pumpKeep MC topped off.....if it goes empty/sucks air into system you have to start all overChanging fluid completely.....suck old out of MC with turkey baster then fill with new.Bleed each wheel position until new fluid shows up (Keep that MC full)Start at farthest postion

Old-Biscuit wrote:Check master cylinder level......needs to be fullThen starting at the brake farthest away from MC bleed brake fluid thru it.If you have a vacuum pump........follow directions that came with that pumpKeep MC topped off.....if it goes empty/sucks air into system you have to start all overChanging fluid completely.....suck old out of MC with turkey baster then fill with new.Bleed each wheel position until new fluid shows up (Keep that MC full)Start at farthest postionThis is what i am prepared to do.I am just wondering if it is necessary to bleed the mc first?

To bleed a master cylinder, rig two connections at the outlets of the master cylinder to two tubes that go back up and over down into the reservoirs. Make sure they are full. Have an assistant slowly push down the brake pedal several times until there are no air bubbles. Having said that, I have only bled master cylinders when I was replacing them. The normal routine of bleeding the brake lines is probably sufficient, unless you have some reason to believe that there is a problem with the master cylinder.

Son of Norway wrote:To bleed a master cylinder, rig two connections at the outlets of the master cylinder to two tubes that go back up and over down into the reservoirs. Make sure they are full. Have an assistant slowly push down the brake pedal several times until there are no air bubbles. Having said that, I have only bled master cylinders when I was replacing them. The normal routine of bleeding the brake lines is probably sufficient, unless you have some reason to believe that there is a problem with the master cylinder.I am just trying to get an idea if bleeding the the breaks from the calipers will do the same trick of getting the air from the mc?

Yes, I believe it will do the same job as long as you push sufficient fluid through the system. I like to push enough fluid through to replace the fluid, instead of just bleeding the brakes.

brake bleeder tool | Good Sam Community

12 Replies

joe0508
Explorer
Nov 26, 2015
Old-Biscuit wrote:
Check master cylinder level......needs to be full

Then starting at the brake farthest away from MC bleed brake fluid thru it.

If you have a vacuum pump........follow directions that came with that pump

Keep MC topped off.....if it goes empty/sucks air into system you have to start all over

Changing fluid completely.....suck old out of MC with turkey baster then fill with new.
Bleed each wheel position until new fluid shows up (Keep that MC full)
Start at farthest postion
This is what i am prepared to do.I am just wondering if it is necessary to bleed the mc first?
Old-Biscuit
Explorer III
Nov 26, 2015
Check master cylinder level......needs to be full

Then starting at the brake farthest away from MC bleed brake fluid thru it.

If you have a vacuum pump........follow directions that came with that pump

Keep MC topped off.....if it goes empty/sucks air into system you have to start all over

Changing fluid completely.....suck old out of MC with turkey baster then fill with new.
Bleed each wheel position until new fluid shows up (Keep that MC full)
Start at farthest postion

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brake bleeder tool

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