Master cylinder replacement

If the brake pedal sticks on the way up then i would have to say there is a problem in the master cylinder, even with other brake problems the pedal should always return,
also when installing the booster make the linkage to brake pedal and brake switch is installed correctly.

fill master cylinder, start at right rear. the way I do it is make sure cap is back on master cylinder. pump the brakes a few times then hold them. have another person open the bleeder valve at the tires until brakes go to floor. hold them down until bleeder is retightened but be sure master cylinder is not out of fluid. then go to left rear and do the same procedure, then right front, then left front. check fluid and if air is all out there should be brakes. good-day ! THIS IS HOW I HAVE ALWAYS DONE IT ! heres a little trick of sorts. you can change a master cylinder, and if you bench bleed it first. and no fluid is lost from the master cylinder lines you do not need to bleed the whole system. but make sure cylinder is full of fluid before putting on vehicle and all air is out of master cylinder.

You 're brake master cylender has failed.
How to change it.

Use a flare wrench and remove the two brake lines.
Then remove the the two nuts that hold it to the fire wall.
Then remove.
Then remove the master cylinder reservoir because your
going to have to put it on the new one.
Drain out any brake fluid from it.
In stall the reservoir on the new master cylinder.
Now you'll have to prime the new master cylinder.
Put the master cylinder in a vise and put brake fluid into it.
Now place your fingers over the two holes that the brake line go into.
Use a large phillips screw driver and push the piston in and out about 10 times.
But, do it slowly. make shore to keep your fingers over the brake line holes. .
Now install it back in.
Remember to bleed your brake system when your done.
Hope this helps give feedback and good luck FixYa

use a flare wrench and remove the two brake lines
then remove the the two nuts that hold it to the fire wall
then remove.
then remove the master cylinder reservoir because your
going to have to put it on the new one
drain out any brake fluid from it
in stall the reservoir on the new master cylinder
now you'll have to prime the new master cylinder
put the master cylinder in a vise and put brake fluid into it
now place your fingers over the two holes that the brake line go into
use a large phillips screw driver and push the piston in and out about 10 times
but do it slowly. make shore to keep your fingers over the brake line holes .
now install it back in
remember to bleed your brake system when your done

Mushy / squishy brakes are usually caused by the brake master cylinder seals failing. You can buy a rebuild kit or a re-built replacement master cylinder. I would recommend the rebuilt master cylinder as all the detail work has already been accomplished and it is not a huge expense. The key is to make sure that your use a bleeder kit to "Pre-bleed" the master kit before installation. Your making sure that the master cylinder is free of air before installation. If you instal it with air in the system it wil take you the better part of a quart of brake fluid to bleed the whole brake system via the wheel cylinders. What will happen is after you install the master cylinder the brakes would still be mushy and until you got the residual air out of all of the lines it would appear and act just like it did before you changed the master cylinder.

Thanks for using FixYa,

Kelly