ok in this situation theres one of three things that could be the prob, first the master cylinder, if the pedal travels all the way to the floor with no resistance that's the problem. 2nd air in the lines, you would have to bleed your breaks, best to take it to professionals. and 3rd you have a broken wheel cylinder, these are located in the rear drums. they break due to excessive wear on the back breaks causing the little piston to come out releasing all the break line pressure. one bad line like that will screw up ur whole system.
You do not reset a master cylinder. You should bench bleed it before installing.
if you have a vice hold the master cylinder and with a pices of wood or something like it push the pistins forword you should see the retaining clip recessed in the unit
bad master cylinder calipers rubber caliper hose and if you have raer drum brakes and the rears are locking the brake shoe are wet from the wheel cyls and you are in grave danger
Master cylinder possible but could also be wheel cylinder problems or warped rotors
its a jm4 i just replaced my master cylinder last week and it was a jm4
Only if the substitute is made of depleted uranium rods.
Worn rubers, lose bleeding valve, loosefluid tube conection. bad seal at tube conection. crack in cylinder,
On the left side of the engine near the brake booster/master cylinder.
If it ain't the clutch itself then its prob. your slave or master cylinder.
Check all of the wheel cylinders for any leaks. Check all of the lines for any kinks, then check the master cylinder again for any air. Air in the system may have gotten into the master cylinder and the cylinder may need bleeding again.
a heater does not have a master cylinder; 'master cylinder' goes with assisted braking.
Logically if the Master Cylinder keeps failing there are only a certain amount of things coming into play here. Either you are buying defective products or the brake fluid is contaminated and causing the Master Cylinder to fail prematurely. Let's start with the Master Cylinders you are installing. I will not name suppliers but not all Master Cylinders are created equal. Some rebuilt Master Cylinders are defective right out of the box. I suggest you buy a NEW master cylinder. Before installing the new Master Cylinder flush all old brake fluid out of the entire system, install a new master cylinder and install fresh fluid from an unopened can. With a new master cylinder and fresh clean fluid, you should have no future problems.