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How exactly do you bleed a master cylinder when its still

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hooked up to your vehicle...
How exactly do you bleed a master cylinder when its still hooked up to your vehicle and you lost all fluid through your rear driver side cylinder while your driving down the road?
Submitted: 1 year ago.Category: Ford
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Answered in 17 minutes by:
7/14/2016
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago
Mike S.
Mike S., ASE Certified Technician
Category: Ford
Satisfied Customers: 7,772
Experience: ASE Certified Master Technician
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To bleed the master cylinder while on the vehicle use the lines like a bleeder screw. In other words, pump the brake pedal up slowly as to not cause bubbles, then hold it down and crank 1 brake line loose at the master cylinder, then tighten the brake line back up before lifting up on the brake pedal. It don't usually matter which one is done first, then do it a few times and then switch to the other brake line at the master cylinder.

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Customer reply replied 1 year ago
Break fluid is filled up to the full mark in the master cylinder and isn't moving when pumping the pedal.
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Perhaps the master cylinder is bad. Is this a new master cylinder? Did you fix that leak at the rear driver side cylinder?

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Customer reply replied 1 year ago
we fixed the leakk by installing new caliber, new rotors and new brake pads in the bank. The master cylinder ran completely dry and the pump comes on when you push the pedal down.
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Do you get any fluid out of the brake lines at the master cylinder when trying to bleed it?

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Customer reply replied 1 year ago
Are you there?
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

yes

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Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

did you not see my reply, "Do you get any fluid out of the brake lines at the master cylinder when trying to bleed it?"

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Customer reply replied 1 year ago
No we don't but the pump turns on
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Replace the master cylinder.

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Customer reply replied 1 year ago
We just need to bleed or prime it while its in place. How do you do that?
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

That was the very first thing I told you.

To bleed the master cylinder while on the vehicle use the lines like a bleeder screw. In other words, pump the brake pedal up slowly as to not cause bubbles, then hold it down and crank 1 brake line loose at the master cylinder, then tighten the brake line back up before lifting up on the brake pedal. It don't usually matter which one is done first, then do it a few times and then switch to the other brake line at the master cylinder.

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Customer reply replied 1 year ago
Can we mess the electric pump up if we have a air lock in the master cylinder
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

No, but you will most likely have to bleed that abs pump as well. when done.

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Customer reply replied 1 year ago
How do u bleed the abs pump
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

here are the instructions,

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Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Did that answer your question? If so, kindly leave me a positive rating, so I get credit. If you have any more questions, go ahead and ask.

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Customer reply replied 1 year ago
We read the instructions however we did not see anything that mentioned the abs pump or any pump so we would like to know if we continue bleeding the rear brake cylinders per your instructions and the pump continues to come on as we press the pump can this cause any other damage to any other system. Please advise approximately how many times we should follow this procedure before seeing results.
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Then you missed it, "

HINT:

a. Air is bled as the pump motor operates while the brake pedal is being

depressed.

c. As brake fluid is continuously drained while the pump operates, it is not

necessary to repeatedly depress the brake pedal.

g. With the brake pedal depressed, loosen the bleeder plug of the rear disc brake

cylinder RH, continue to hold the brake pedal and allow brake fluid to be

drained from the bleeder plug while the pump motor operates

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Customer reply replied 1 year ago
OK thank you I will tell my husband. I appreciate your time
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Did you happen to catch the bleeding sequence that starts at the rf, then lf, rr then lr.

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Customer reply replied 1 year ago
No what is rf if RR and ir?
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Right front, left front, right rear and left rear, that appears to be the order that they are bled. The exact opposite as normal.

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Customer reply replied 1 year ago
OK thank you so much we will try it now and get back with you tomorrow if we need help...lol
Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

ok, tomorrow is fine but I have to warn you, I haven't been getting to sleep until into the wee hours of the morning, last nite 5am, so I don't get up till way past noon until I see my doctor and get back on track.

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Ford Mechanic: Mike S., ASE Certified Technician replied 1 year ago

JustAnswer® is not a free service. I work hard to make sure you're satisfied with my service and I only get credit for my answers based on your rating. Once you're satisfied, please leave a positive rating.

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