a heater does not have a master cylinder; 'master cylinder' goes with assisted braking.
just the slave cylinder, for your brakes.
In order to replace the master cylinder with ABS attached to the master cylinder on a 1995 Grand Am you will need to complete the following steps: Disconnect the negative battery cable. Locate the master cylinder which is attached to the drivers side of the firewall. Remove the ABS brake line from the master cylinder using a wrench. Disconnect the fluid hose from the master cylinder using a wrench. Unscrew the nuts that hold the master cylinder in place. Remove the master cylinder and install a new one. Reattach the fluid hose to the master cylinder. Reattach the ABS brake line to the master cylinder. Tighten all the nuts and bolts and reconnect the negative battery cable.Once all of these steps have been completed you can be sure that your master cylinder has been properly replaced and is ready for use.
What about the master cylinder? They go out, ha. That's all I can help you with though.
If the master cylinder reservoir is empty, you have a leak somewhere. If the master cylinder reservoir is full, the master cylinder is bad.
Good time to replace all the brake fluid. Remove the brake lines from the Master Cylinder and pump the master cylinder dry. Add fresh brake fluid from an unopened can and bleed the master cylinder. Reinstall the brake lines and then bleed all brake lines until you see clean fluid. Keep adding fluid to the Master Cylinder until you are done.Good time to replace all the brake fluid. Remove the brake lines from the Master Cylinder and pump the master cylinder dry. Add fresh brake fluid from an unopened can and bleed the master cylinder. Reinstall the brake lines and then bleed all brake lines until you see clean fluid. Keep adding fluid to the Master Cylinder until you are done.
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.
It means your master cylinder needs to be replaced or rebuilt. The seals inside the cylinder can go bad and cause this to happen.
The 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.
Bad master cylinder.
Better off purchasing a new master cylinder or a re-manufactured. They are not expensive and all the machine work is done.
First thing I would do is check the fluid level in the Master Cylinder, and bleed the brakes. Start at RR, then LR, RF, and end up at LF, making sure you keep the Master Cylinder full at all times. If that does not help, replace the Master Cylinder.First thing I would do is check the fluid level in the Master Cylinder, and bleed the brakes. Start at RR, then LR, RF, and end up at LF, making sure you keep the Master Cylinder full at all times. If that does not help, replace the Master Cylinder.