How to flush out brake lines - 1965 Ford Mustang

A pressure bleeding system is the best way Joe. Pump from the wheel upwards to the master cylinder. Air bubbles like to rise.

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the damage has been done
you will have to replace all of the rubber components eventually
as a stop gap measure flush all of the system with methylated spirits
probably will use a gallon of the flush
bleed each line until you have no signs of oil pump using the brake pedal and a helper
It will take some time to flush out the system
then refill with brake fluid and again flush well

Don't drive it it happen to me ps fluied can ruin everything the best way to do a flush do it on wheel a time remov e the 10 mm bolt then hold your finger on the bleeder hole have someone slowly pump the brake paddle at she same time some one near the resort or needs to keep adding fluied once all the fluied drain out you can tell because it'll look clean do every tire side all 4 wheels good luck

you need to flush out the brake lines. How to do Complete Brake Flush and Bleed

There may be dirt in the lines or the calipers. When you press the pedal it forces fluid into all 4 brake calipers. If a line has dirt in it, it might get stuck in one of the orifices, causing them to stay in the locked position. Over time, the pressure in the caliper leaks back out and they release.
Have a mechanic do a brake fluid flush, preferable a "reverse" flush to push everything up and out through the brake fluid reservoir. Total cost should be about $30 for the fluid and 1 hour of shop time.

the only time you should have to bleed the brakes is if you opened a bleeder screw, repaired a brake line, replaced a brake hose, replaced a caliper/wheel cylinder, or replaced the master cylinder.

If you have not opened up the hydraulic system than it is not necessary to bleed the brakes.

It can be beneficial to flush the brake system. Brake fluid is hygroscopic which means it likes to absorb moisture. If your brake fluid is dark in color or even green (green color is caused by the erosion of the inside of the brake lines do to water contamination) it wouldn't hurt to flush the brake system. this would essentially be bleeding all four corners until clear fluid comes out. Water in the brake system reduces the boiling point of the brake fluid which can lead to brake failure under extreme braking conditions.

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the only time you should have to bleed the brakes is if you opened a bleeder screw, repaired a brake line, replaced a brake hose, replaced a caliper/wheel cylinder, or replaced the master cylinder.

If you have not opened up the hydraulic system than it is not necessary to bleed the brakes.

It can be beneficial to flush the brake system. Brake fluid is hygroscopic which means it likes to absorb moisture. If your brake fluid is dark in color or even green (green color is caused by the erosion of the inside of the brake lines do to water contamination) it wouldn't hurt to flush the brake system. this would essentially be bleeding all four corners until clear fluid comes out. Water in the brake system reduces the boiling point of the brake fluid which can lead to brake failure under extreme braking conditions.

Let me know if you have any questions and thank you for using FixYa.com!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

A few things it could be. Cheapest is to flush your brake fluid out with new fluid. This alone has solved many soft brake problems with TB's. You also could have air in the line, but flushing the system out would take care of this. Could have a pin hold in the diaphram on the brake booster. Another problem I've seen is a bad ABS sensor.

You have to replace the master cylinder because the fluid that leaks from it is getting into the brake booster and compromising the seals. So you can probably get away with the booster and cylinder. Unless the ABS unit is a part of the either of the affected parts, or isn't working properly, you can leave it alone. ---------------------
A fluid-distribution system includes a plurality of fluid-distribution nodes with three-way ports attached to bleed/flush lines and alternate ports attached to vacuum lines. A first pump is used to draw new brake fluid from a new fluid container, push it through the manifold and ports, and through the bleed/flush lines. Fluid flow through the ports is selectively controlled by a computing device. In this manner, a vehicle's brake system including individual brake lines and ABS systems, may be flushed in a prescribed sequence. The vacuum lines are connected to a second pump via alternate ports of the sequential control valve manifold and may be used evacuated air and contaminated brake fluid from the vehicle's bleeder valves or master cylinder. Additionally, the bleed/flush lines may be connected to the alternate ports during priming or purging of the system. This also facilitates storage of the bleed lines as it prevents brake fluid from spilling and prevents air from entering the system. thanks.