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I am currently restoring a 1987 Nissan 300zx

I replaced the master cylinder and when bleeding the brakes the pedal would hold for a few seconds and then slowly fall I ran about 2 liters of fluid through it and determined that the master cylinder was defective and returned it for a new one

I bench bleed the new master cylinder and installed it and ran about two liters of fluid through it my previous issue was resolved but when I hit the brake pedal it is soft but doesn't go all the way to the floor after two-three pumps it feels as it should let it sit for 30 seconds and I have no breaks until pumping the pedal.

There is no fluid leaking anywhere and I am getting clean fluid out of all four calipers (new breaks right around) I have also played with the adjustment on the brake booster and still, nothing calipers are on the correct sides as well

Replaced all flex lines still unable to bleed brakes

Wazy
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2 Answers2

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Because there are no external leaks and the brake pedal now doesn't go to the floor but (sometimes) is soft, either a) air is still trapped in the brake system, or b) one or more of the car's flexible brake lines has fractured internally, thus temporarily allowing brake fluid to fill the space between the line's two layers. Read the answer posted here.

Pᴀᴜʟsᴛᴇʀ2
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DavidRecallsMonica
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reaction disk..... this took way to long to figure out

Wazy
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