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I Have a 1979 Chevy C60 and after you pump the brakes they lose pressure changed master cylinder What is next step to get them work?

It sounds like you've already addressed the most likely culprit - the master cylinder. However, replacing the master cylinder isn't always the end of the story. Here's a breakdown of what to do next:

1. Thoroughly Bleed the Brakes:

* Why it's crucial: Air in the brake lines will prevent proper pressure buildup.

* How to do it: You'll need a brake bleeder kit and an assistant. The process involves opening bleeder valves on each wheel, one at a time, while your assistant pumps the brake pedal. This forces air out of the system. Refer to your vehicle's manual or a reputable repair guide for detailed instructions.

2. Inspect Brake Lines and Hoses:

* Why it's important: Worn, cracked, or leaking brake lines can cause fluid loss and air entry into the system.

* How to check: Visually inspect all lines and hoses for damage. Look for rust, corrosion, leaks, and any signs of wear. Replace any damaged components.

3. Check Wheel Cylinders:

* Why it's essential: Wheel cylinders are the components that push the brake pads against the rotors. Worn wheel cylinders can cause fluid leaks and a spongy brake pedal.

* How to inspect: If you have a brake pedal that feels spongy even after bleeding, the wheel cylinders may be leaking internally. You'll need to remove them and check for signs of damage or leaking.

4. Consider the Brake Booster:

* Why it matters: The brake booster assists in applying pressure to the brakes. A faulty booster can lead to a soft pedal, especially at low engine speeds.

* How to check: Have a mechanic check the booster for proper operation and vacuum leaks.

5. Don't Forget the Basics:

* Brake Fluid Level: Make sure the brake fluid reservoir is full and that the fluid is clean.

* Proper Brake Pad/Shoe Thickness: Thin brake pads/shoes will require more pedal travel and contribute to a spongy feel.

Important Notes:

* Safety First: Always take necessary safety precautions when working on your vehicle. Use jack stands and chocks to secure the vehicle, and wear appropriate safety gear.

* Seek Professional Help: If you're not comfortable performing brake repairs yourself, seek the assistance of a qualified mechanic. Brake system issues are serious and should not be taken lightly.

Let me know if you have any more questions.