Brake pedal goes to the floor bleeding the whole system, no air.

Hi,

Are you able to pump the pedal to get brakes? Also, are you certain there are no leaks, the front rubber brake hoses at the calipers are in good condition (not expanding), and is there a lot of pressure when bleeding the system?

Take a look through this link and see if anything helps.

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

Here are the manufacturer's directions for bleeding the new MC and the brakes. See if anything has been done differently. The attached pictures correlate with the directions.

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1987 Dodge or Ram Truck Dakota 4WD V6-239 3.9L
Manual Bleeding
Vehicle Brakes and Traction Control Hydraulic System Brake Master Cylinder Service and Repair Procedures Master Cylinder Bleeding Manual Bleeding
MANUAL BLEEDING
Fig 2 Typical Fluid Container And Bleed Hose

pic 1

Fig 3 Front Antilock Valve Bleed Tool Installation

pic 2

NOTES:
- Use Mopar DOT 3 brake fluid, or an equivalent meeting SAE J1703-F and DOT 3 standards, to fill and bleed the system.
- The disc brake hydraulic system can be bled manually or with pressure bleeding equipment.
- On vehicles with disc brakes the brake pedal will require more pumping and frequent checking of fluid level in master cylinder during bleeding operation.

CAUTIONS: Never use brake fluid that has been drained from hydraulic system when bleeding the brakes. Be sure the disc brake pistons are returned to their normal positions and that the pad assemblies are properly seated. Before driving the vehicle, check brake operation to be sure that a firm pedal has been obtained.

Bleeding Procedure
1. If master cylinder has been overhauled or a new cylinder will be installed, bleed cylinder on bench before installation. This shortens time needed to bleed system and ensures proper cylinder operation.
2. Wipe master cylinder reservoir and filler caps clean with shop towels. Use Mopar brake cleaner if exterior of reservoir and filler caps are extremely dirty.
3. Remove reservoir filler caps and fill reservoir with Mopar, or equivalent DOT 3 brake fluid.
4. Open all caliper and wheel cylinder bleed screws.
5. Close bleed screws when fluid starts flowing1 from each bleed screw.
6. Top off master cylinder reservoir again.
7. Bleed brakes in following sequence:
- master cylinder
- rear antilock valve
- front antilock valve
- right rear wheel
- left rear wheel
- right front wheel
- left front wheel
8. Observe following precautions during bleeding procedure:
- Do not pump brake pedal at any time while bleeding. Air in system will be compressed into small bubbles that are distributed throughout hydraulic system. This will make a second and third bleeding operation necessary.
- Bleed only one valve, or wheel brake unit at a time and use a bleed hose on each wheel cylinder and caliper bleed screw.
- Attach one end of bleed hose to bleed screw and insert opposite end in glass container partially filled with brake fluid. Glass container makes it easier to see air bubbles as they exit the bleed hose.
- Be sure end of bleed hose is immersed in fluid. Immersing hose end in fluid prevents air from being drawn back into cylinder and brake line.
9. Bleed master cylinder first. Have helper operate brake pedal while bleeding each master cylinder fluid outlet line.

CAUTION: Do not allow the master cylinder to run out of fluid when bleeding the brakes. An empty cylinder will allow additional air to be drawn into the system. Check the cylinder fluid level frequently and add fluid as needed.

10. Bleed rear brake antilock valve next. Bleed valve at brake line fittings one at a time. Surround line fittings with shop towels to catch fluid bled from valve.
11. On models with ABS, if a replacement front antilock valve and motor assembly has been installed, bleed new valve as follows:
a. Bleed valve stem must be held inward (in open position) to fully bleed upper section of new valve assembly. Use Bleed Valve Depressor Tool 6670 to press valve stem inward to open position.
b Remove cap from bleed valve stem. Then slide notched side of bleed tool onto boss that surrounds bleed valve stem.
c. Tighten thumbscrew on bleed tool just enough to push valve stem inward about 0.51 - 0.76 mm (0.020 - 0.030 in.).
d. Bleed new valve assembly at each brake line fitting one at a time. Surround line fittings with shop towels to catch fluid.
e. Remove bleed tool and install cap on valve stem.
12. On models with ABS, if original front anti- lock valve assembly is still in place, bleed valve does not have to be held open with tool. Bleed valve assembly at each brake line fitting one at a time.
13. Bleed first wheel brake unit as follows. Start at left rear wheel:
a. Open caliper or wheel cylinder bleed fitting 1/2 to 3/4 turn.
b. Have helper press and hold brake pedal to floor.
c. Tighten bleed fitting and have helper release brake pedal.
d. Continue bleeding operation until fluid entering bleed container is clear and free of bubbles.
14. Repeat bleeding operation at remaining wheel brake units. Discard fluid bled into glass container. It should not be reused.
15. Check and top off master cylinder reservoir fluid level.
16. Verify proper brake operation before moving vehicle.

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Let me know if this helps.

Joe