Master Cylinder Question
Thread Starter
Safety Car
Joined: Sep 2011
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From: Madeira Beach, FL
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Master Cylinder Question
Hello Forum,
I purchased a remanufactured MC from Rock Auto (Cardone). It has the bleeders on the side of the reservoir. My question is do I need to bench bleed first it or just install and bleed like calipers? I have a mighty vac to draw the fluid through.
Thank you,
Marshal
I purchased a remanufactured MC from Rock Auto (Cardone). It has the bleeders on the side of the reservoir. My question is do I need to bench bleed first it or just install and bleed like calipers? I have a mighty vac to draw the fluid through.
Thank you,
Marshal
Thread Starter
Safety Car
Joined: Sep 2011
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From: Madeira Beach, FL
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Thanks
Marshal
Marshal
Team Owner
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From: Crossville TN
Actually, you need to bleed the master cylinder BEFORE bleeding the rest of the braking system. You can install it on the booster and bleed it by pumping the brake pedal, using the installed bleeder fittings and two pieces of plastic tubing. (This bleeding method, tubing and a clip to hold the tubing pieces over the reservoirs should be included with the new master cylinder.)
In any event, the M/C MUST be bled completely free of air bubbles BEFORE you try bleeding the rest of the system. And it may take MANY pumps of the pedal to remove ALL air from the M/C. Once it is bled, remove the tubing,and seat the bleeders. Then you can start bleeding each brake unit.
In any event, the M/C MUST be bled completely free of air bubbles BEFORE you try bleeding the rest of the system. And it may take MANY pumps of the pedal to remove ALL air from the M/C. Once it is bled, remove the tubing,and seat the bleeders. Then you can start bleeding each brake unit.
Thread Starter
Safety Car
Joined: Sep 2011
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From: Madeira Beach, FL
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Thank you Sir!
I was hoping to mount to booster and bleed as such.
Marshal
I was hoping to mount to booster and bleed as such.
Marshal
Le Mans Master
Joined: Aug 2017
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From: Cool Northern Michigan
Marshal,
Click on my profile, then photo albums to see how to bench bleed.
Nothing good ever comes from touching the brake pedal. never. You will trip the Proportioning Valve / dash light. Use you mighty vac to remove the air bubbles.
Click on my profile, then photo albums to see how to bench bleed.
Nothing good ever comes from touching the brake pedal. never. You will trip the Proportioning Valve / dash light. Use you mighty vac to remove the air bubbles.
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
Hello Forum,
I purchased a remanufactured MC from Rock Auto (Cardone). It has the bleeders on the side of the reservoir. My question is do I need to bench bleed first it or just install and bleed like calipers? I have a mighty vac to draw the fluid through.
Thank you,
Marshal
I purchased a remanufactured MC from Rock Auto (Cardone). It has the bleeders on the side of the reservoir. My question is do I need to bench bleed first it or just install and bleed like calipers? I have a mighty vac to draw the fluid through.
Thank you,
Marshal
Read this.
https://www.corvetteforum.com/forums...-cylinder.html
After you get no more air via the bleed holes, then bleed the calipers.
Last edited by cagotzmann; Jan 15, 2020 at 09:44 PM.
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Thread Starter
Safety Car
Joined: Sep 2011
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From: Madeira Beach, FL
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Thanks
Marshal
Marshal
Thread Starter
Safety Car
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From: Madeira Beach, FL
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Question on MC with bleeders. I am still full of air in the MC and the peddle goes to the floor and the brake light comes on briefly and goes out.
I bench bleed it I thought sufficiently so I mounted it to car. Now can I just pump the peddle with the bleeders open to remove the air like l would for a caliper or does the MC need to come off the car? I've read all the MC bleeding threads on the forum and realize the rear of the car will need to be elevated. No one addressed bleeding the MC using the bleeders in the MC. I know I can't even begin bleeding the calipers till I get some pedal. Any help is greatly appreciated.
Marshal
I bench bleed it I thought sufficiently so I mounted it to car. Now can I just pump the peddle with the bleeders open to remove the air like l would for a caliper or does the MC need to come off the car? I've read all the MC bleeding threads on the forum and realize the rear of the car will need to be elevated. No one addressed bleeding the MC using the bleeders in the MC. I know I can't even begin bleeding the calipers till I get some pedal. Any help is greatly appreciated.
Marshal
Le Mans Master
Joined: Apr 2001
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From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Question on MC with bleeders. I am still full of air in the MC and the peddle goes to the floor and the brake light comes on briefly and goes out.
I bench bleed it I thought sufficiently so I mounted it to car. Now can I just pump the peddle with the bleeders open to remove the air like l would for a caliper or does the MC need to come off the car? I've read all the MC bleeding threads on the forum and realize the rear of the car will need to be elevated. No one addressed bleeding the MC using the bleeders in the MC. I know I can't even begin bleeding the calipers till I get some pedal. Any help is greatly appreciated.
Marshal
I bench bleed it I thought sufficiently so I mounted it to car. Now can I just pump the peddle with the bleeders open to remove the air like l would for a caliper or does the MC need to come off the car? I've read all the MC bleeding threads on the forum and realize the rear of the car will need to be elevated. No one addressed bleeding the MC using the bleeders in the MC. I know I can't even begin bleeding the calipers till I get some pedal. Any help is greatly appreciated.
Marshal
Thread Starter
Safety Car
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From: Madeira Beach, FL
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Wow! Thanks didn't even know all that was necessary for a direct swap out on a master cylinder.
Marshal
Marshal
Le Mans Master
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From: Was New Orleans but swam to Baton Rouge LA
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Le Mans Master
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From: Lake Tahoe, CA
Hello Forum,
I purchased a remanufactured MC from Rock Auto (Cardone). It has the bleeders on the side of the reservoir. My question is do I need to bench bleed first it or just install and bleed like calipers? I have a mighty vac to draw the fluid through.
Thank you,
Marshal
I purchased a remanufactured MC from Rock Auto (Cardone). It has the bleeders on the side of the reservoir. My question is do I need to bench bleed first it or just install and bleed like calipers? I have a mighty vac to draw the fluid through.
Thank you,
Marshal
https://www.corvetteforum.com/forums...s-finally.html
Le Mans Master
Joined: Aug 2017
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From: Cool Northern Michigan
I am not familiar with cardone units. But I suspect that there is a slight difference in your cardone compared to the original Delco MC. That slight difference will mess you up at the mounting flange / piston end and booster rod distance like Sigforty mentioned.
GM changed designs over the years but box stores and car parts counter kids think one size fits all. Even the older manual brake MC were different than the P.B. units of the exact same yr.
I hope you didn't buy the wrong MC.
Last edited by HeadsU.P.; Jan 21, 2020 at 07:07 PM.
Le Mans Master
Joined: Mar 2004
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From: Little Rock AR
The bleeder screws on the master cylinder was used by GM to fill the system on the assembly line. They are not used in service.
I always bench bleed with short lines looped back into the fluid but it can be done by blocking the ports. The piston is stroked manually to pump out the air bubbles. I like to tilt it in both directions a bit to make sure all the air is all gone. Motive pressure bleeder is a life saver once you have it properly mounted on the car.
I always bench bleed with short lines looped back into the fluid but it can be done by blocking the ports. The piston is stroked manually to pump out the air bubbles. I like to tilt it in both directions a bit to make sure all the air is all gone. Motive pressure bleeder is a life saver once you have it properly mounted on the car.
Thread Starter
Safety Car
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Sorry , but if I understand your above post I can not use these bleeders on the MC for bleeding on the car as I would with a bleeding kit?
I thought they saved you from having to disconnect the brake lines from the MC?
Marshal
I thought they saved you from having to disconnect the brake lines from the MC?
Marshal
Le Mans Master
Joined: Mar 2004
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From: Little Rock AR
You read that right. They are not used at all in service. Bench bleeding is reccomended.