How do you change a master cylinder?

Answer 1

1.Take off old one.

2.Bring to parts store and buy the same one

3.Put new cylinder onto table vice

4.Connect a small hose to the base (where you took the lines off)

5.Place a hose on each opening,run the hose to the top of the reservoir

6.Fill reservoir with brake fluid

7.(be sure it is securely held in place)8.press in on the end of the movable part of the cylinder slowly until no bubbles are coming up from the fluid.This removes the air in the cylinder. Put new cylinder on the same way you took the old one off. Keep brake fluid in reservoir. Bleed brake lines from right rear, left rear, right front, left front.

To bleed brakes

A. press brake pedal to floor (this puts pressure in system)

B.The other person needs to open bleeder valve on caliper/wheel cylinder. Before the person lets the pedal up the valve must be closed(if it is not air will come back into the system). When valve is closed pump pedal 3-5 times then repeat steps A,B.For about five times.Once you have completed the process the pedal should be solid. Test drive carefully; if it brakes properly then it is good but if it sinks and is spongy then there is still air in the system

P.S. Be sure brake fluid is full. Be sure to press and hold pedal to its fullest extent. Be sure that when the pedal is pressed immediately that it goes to a screeching stop.