Fluid not getting to any of the brakes

Tiny
CARL FOWLER2
  • MEMBER
  • 1998 FORD F-150
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Change the booster and master cylinder. The two brake lines coming off the master cylinder were removed completely.
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Sunday, February 9th, 2020 AT 5:17 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If you remove the brake lines at the master cylinder, is there pressure when you have a helper depress the brake pedal? Was the system properly bled including the new master cylinder? Does the brake pedal go to the floor? Was the push rod between the master cylinder and the booster properly installed?

Let me know.

Joe
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Wednesday, February 12th, 2020 AT 8:19 PM
Tiny
CARL FOWLER2
  • MEMBER
Yes there is pressure. I Bench bled the master cylinder. The pedal will only go to the floor if I loosen the lines at the master cylinder. I put the new booster on and after I bench bled the master cylinder I installed it right to the booster did not mess with the push rod coming out of the booster.
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Monday, February 17th, 2020 AT 1:17 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Okay I'm confused. The heading indicates the pedal goes to the floor. You mentioned that it only goes to the floor if you loosen the brake lines. When you try bleeding the system, does anything come out at the wheels? How are you now bleeding the brakes? Take a look through these directions for bleeding the system specific to you vehicle and see if you are doing anything differently. The attached pics correlate with the directions.

____________________________________________

1998 Ford Truck F 150 2WD Pickup V8-4.6L SOHC VIN 6
Manual Bleeding
Vehicle Brakes and Traction Control Hydraulic System Brake Bleeding Service and Repair Procedures Manual Bleeding
MANUAL BLEEDING
WARNING: BRAKE FLUID CONTAINS POLYGLYCOL ETHERS AND POLYGLYCOLS. AVOID CONTACT WITH EYES. WASH HANDS THOROUGHLY AFTER HANDLING. IF BRAKE FLUID CONTACTS EYES, FLUSH EYES WITH RUNNING WATER FOR 15 MINUTES. GET MEDICAL ATTENTION IF IRRITATION PERSISTS. IF TAKEN INTERNALLY, DRINK WATER AND INDUCE VOMITING. GET MEDICAL ATTENTION IMMEDIATELY.

CAUTION:
- Do not allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with the specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system.
- Brake fluid is harmful to painted and plastic surfaces. If brake fluid is spilled onto a painted or plastic surface, immediately wash it with water.

NOTE: When any part of the hydraulic system has been disconnected for repair or replacement, air may get into the system and cause spongy brake pedal action. This requires bleeding of the hydraulic system after it has been properly connected. The hydraulic system can be bled manually or with pressure bleeding equipment.

Pic 1

1. Clean all dirt from and remove the brake master cylinder filler cap and fill the brake master cylinder reservoir with the specified brake fluid

pic 2

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

Pic 3

5. Tighten the RH rear bleeder screw.
6. Repeat Steps 2, 3, 4, and 5 for the LH rear bleeder screw.

Pic 4

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

Pic 5

10. Tighten the RH front disc brake caliper bleeder screw.
11. Repeat Steps 7, 8, 9, and 10 for the LH front disc brake caliper bleeder screw.

__________________________________

Let me know.

Joe
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Monday, February 17th, 2020 AT 1:08 PM
Tiny
CARL FOWLER2
  • MEMBER
Ok. I can not get fluid to the caliper to be able to use the bleeder. The 2 lines coming off the Master cylinder go to a thing that has 3 more brake lines coming out of it. It is some kind of pump. I can get fluid from the master cylinder lines down to where they connect to it but that's all. I assume the other brake lines connected to it go to the 2 front and one for the back. When I pump the brakes up I can c air getting in to the reserve. I put a new booster on it is there some kind of ajustment u have to do to the booster.
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Monday, February 17th, 2020 AT 11:15 PM

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