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The basic principle of bleeding a master cylinder is, "get all the air out of the system".
A master cylinder is nothing more than a hydraulic pump. When you press on the pedal, the hydraulic oil in the pump is pressurized, and the piston at the opposite end moves.
Any air bubbles in the hydraulic oil will compress, making the pedal feel "soft", and you will not have adequate control of the hydraulic system, whether it's the brakes or the clutch.
So here's the principle:
When you press on the pedal, the oil moves FROM the master cylinder, through the hydraulic lines to the clutch slave cylinder or the brake wheel cylinders. Any air in the lines moves along with the fluid.
If you open a wheel cylinder (or clutch slave cylinder) bleed valve when the master cylinder pedal is pressed, hydraulic fluid will be released, and possibly any air bubbles that may be in the line. If you close the bleed valve before air can get back in, you MAY be able to get all of the air bubbles out of the line.
In reality, you typically need to do that several times for each wheel before you can get all of the air out, and you may need to repeat the procedure a few times for the clutch slave cylinder before it will work properly.
If you're bleeding the line properly, keeping the master cylinder full of fluid and you STILL can't get rid of all the air in the lines, it's possible that you have a leaky master cylinder or slave cylinder. Sometimes they suck air when they're going bad.
Good luck. Hope this helped.
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∙ 12y ago
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If the slave cylinder wont build up pressure and you've tried bleeding it and the master cylinder and the slave cylinder is good then what would make it not work?
a leak in the pressure line could do it. are you sure the seals in the cylnders are good? Is the slave not holding pressure, or is the master not building pressure? How did you bleed it? it makes a difference. Also, if the master or slave cylinders weren't bench bled before installation, it can take a very long time to bleed all of the air out of the cylinders.
How do you bleed a 4 port master cylinder?
If a pressure type brake fluid dispenser is available attach it to the top of the master cylinder. Other wise fill the master cylinder, start with the wheel cylinder that is furthermost from the master, and bleed until fluid comes out clean and free from bubbles. make sure to replenish the the master cylinder as needed. then proceed to the next farther wheel cylinder and repeat with the rest of the wheel cylinders. top off the master cylinder. Test with the engine off then with the engine running before driving.
You replaced the master and slave cylinder for your clutch on your Nissan 240 sx and there is no pressure?
did you bleed it? try raising it from the differential to get a good bleed on your clutch. and if that doesn't work make sure the rod from the pedal to the actual master cylinder is screwed on. if it isn't, ur jsut kicking a pedal.
Where and how do you adjust the clutch on a 94 escort?
The clutch can't be adjusted. It is an hydraulic clutch. The clutch pedal sends pressure from the master cylinder to the slave cylinder on the clutch. IF you are having trouble with it the thing to do is bleed the air out at the slave cylinder. Have an assistant pump the clutch and hold it to the floor. Then open the bleed valve on the slave cylinder to let the air out of the system. On the final bleed hold the clutch to the floor and close the bleed valve on the slave cylinder. The clutch master cylinder operates of the brake fluid reservoir. Make sure you keep this full of brake fluid as you bleed the clutch.
Where is the clutch master cylinder on 2007 Mazda 3?
how do you bleed the clutch master cylinder in a 2005 mazda 3
Why Brakes still go to floor after bleeding 2004 and replacing master cylinder?
There is still no fluid pressure. Make sure that the master cylinder was bled as well as the wheel cylinders. New master cylinders can be tough to bleed all of the air out. The new master could be defective.
How do you bleed a slave cylinder on a 95 camaro with no bleed valve?
There is no bleed screw on the 3.4 clutch. You have to unbolt the slave cylinder from the trans and drop it down so that it and the line are lower than the master cylinder, then pump the piston in/out to force any trapped air up to the master cylinder.
How do you reset the master cylinder in a 1997 Cadillac Deville?
You do not reset a master cylinder. You should bench bleed it before installing.
How do I bleed a 95 Chevy clutch master cylinder?
Need to know how to assemble 95 Chevy clutch master cylinder?
When do you bleed your clutch?
after the clutch master cylinder has been replaced.
Why would you have no brake pressure after replacing brakes rotors calipers and after bleeding the brakes on a 1991 cutlass supreme?
Bleed the master cylinder.& then rebleed the system.
How do you repair a master cylinder on a Ford Taurus?
get a new one then bleed your brakes A new Ford master cylinder must be bench bled before it is installed, or it will be impossible to bleed the system later.
