Can not get a stiff break pedal it goes all the way to the floor

Be sure to check the brake hoses at each wheel. I've seen the rubber "balloon" at times when the rubber is old and soft. If the hoses are ballooning, you will experience a soft brake pedal and they would need replacement. I am also assuming that you have properly bled all the air from the braking system. I would suspect there is air in the lines. These guides can help you fix it.

https://youtu.be/w7gUsj2us0U

and

https://youtu.be/WDxvEQrMkBg

and

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down these guides and report back.

Did you manually bleed the master cylinder before you installed it? It sounds like that step might have been skipped. If so you need to remove it and bleed it. Most of them have instructions that come with them that explain how to do it. If not I can help you.

Good afternoon,

Do you mean the pedal went to the floor before you did the calipers?

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

You may have a bad master cylinder.

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

I attached the procedure for replacing the master cylinder.

Roy

Okay, make sure of one thing. Check the calipers and make sure the bleeder is at the top of the caliper. They front calipers are the same except the bleeder valve location.

I attached the bleeding procedure and a picture of the bleeder location.

Roy

1. Note: It is not necessary to do a complete brake system bleed if only the disc brake caliper was disconnected.

Place a box end wrench on the disc brake caliper bleeder screw. Attach a rubber drain tube to the disc brake caliper bleeder screw, and submerge the free end of the tube in a container partially filled with clean brake fluid.
2. Have an assistant pump the Brake Pedal (BP) and then hold firm pressure on the brake pedal.
3. Loosen the disc brake caliper bleeder screw until a stream of brake fluid comes out. While the assistant maintains pressure on the brake pedal, tighten the disc brake caliper bleeder screw.
Repeat until clear, bubble-free fluid comes out.
Refill the brake master cylinder reservoir as necessary.

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4. Tighten the disc brake caliper bleeder screw.

You're leaking somewhere -the brake M/C just don't get dry like that.

Better get it fix fast -you're in danger here and others -don't use duck tape lol BTW I didn't know it was dark last night, the only thing I know is to help people with car problems.

You have a nice day comeback if needed-Good Luck!

Go to a parts store and match your brake line with a short piece- fabricate it and use a compression fittings on it.

I'm afraid you will need to re-bleed the system. Check for any leaks before you start.

MANUAL BLEEDING
NOTE:Check fluid level in master cylinder frequently during brake bleeding sequence.

Non-ABS
Clean dirt from master cylinder fluid reservoir filler cap area. Fill reservoir with brake fluid. If master cylinder is known or suspected to have air in bore, bleed master cylinder first. To bleed brake system, release vacuum from power unit by depressing brake pedal several times.
Install clear vinyl bleed hose onto first bleed valve to be serviced. See the BRAKELINE BLEEDING SEQUENCE table. Place other end of hose in clean transparent container.
Partially fill container with clean brake fluid so end of hose is submerged in fluid. Open bleed valve 1-2 turns. Have an assistant slowly depress brake pedal through its full travel.
Close bleed valve and release pedal. Pump pedal several times to push air toward wheel cylinders. Repeat procedure until flow of brake fluid is clear and shows no sign of air bubbles. Proceed to next bleed valve.
Check brake pedal for firmness. If brake pedal feels "spongy", repeat bleeding procedure. Top off brake fluid reservoir.
BRAKE LINE BLEEDING SEQUENCE
ApplicationSequence
All Models RR, LF, LR & RF