Spongy brakes

[guzzigreg]

Guys I'm at the end of ideas here. Solid Brake line went so I replaced it, also new pads. I cannot get the air out. CANNOT!! Brought it to my local wrench he had it 4 days he's stumped. Put about a gallon of fluid through it. Tried new master same results. He said he used a power bleeder same. Pedal goes to the floor the truck stops but slowly. Any ideas???? I have steel braided lines. 97 4wd it has 90,000. Still runs great. I tow so the brakes are important. They were never great but not ever like this .

[RJ MALIBU]

Sounds like a vacuum problem.

[blazes9395]

The ABS system has to be bled properly, along with the rest of the system. If the ABS gets air inside it, it will have bad brakes.

[agcneo]

well well, sounds like im not the only one with this problem, i went and replaced every damn thing that had to do with the breaks, except the steel braided lines, how do you bleed the abs?

[Southern Comfort]

ABS BLEEDING PROCEDURE
NOTE: Bleeding ABS system requires the use of Tech 2 scan tool. An
assistant is required when performing bleeding procedures.
1) Raise and support vehicle. Begin bleeding at right rear
wheel. Install a clear plastic hose to bleed screw. Immerse other end
of hose in container that is partially filled with clean brake fluid.
2) Open bleed screw 1/2 to 1 full turn. Have assistant slowly
depress brake pedal until it reaches full travel. Hold pedal until
bleed screw is closed. Release brake pedal and wait 10-15 seconds.
Repeat until clean bubble-free brake fluid is present at wheel bleed
screw.
3) Check master cylinder fluid level every 4-6 strokes of
brake pedal to avoid running system dry. Repeat steps 2) and 3) on
left rear, then right front, then left front. After bleeding all 4
wheels, go to next step.
4) Using scan tool in FUNCTION TEST, run FUNCTION TEST 4
times consecutively while applying the brake pedal firmly. Release
brake pedal between each test.
5) Rebleed all 4 wheels to remove remaining air from brake
system. Ensure brake pedal feel is appropriate before attempting to
drive vehicle. Rebleed as many times as necessary to obtain
appropriate pedal feel.
DIAGNOSIS & TESTING
NOTE: When testing and diagnosing 4WAL system, use of Tech 2 scan
tool is required.
The Electronic Brake Control Module (EBCM) performs a selfdiagnosis
of the ABS system. The EBCM detects and isolated system
failures, then sets the corresponding diagnostic trouble code (DTC).
Before diagnosing 4WAL system, perform a comprehensive visual
inspection of system by checking wiring harness connectors, harness
routing (pay particular attention to wheel speed sensor wiring harness
routing), applicable fuses in fuse block, and ground connections.
Ensure brake fluid level in master cylinder reservoir is full.
Start 4WAL system diagnosis using DIAGNOSTIC SYSTEM CHECK. If
failures are found when performing diagnostic system check, you will
be directed to enter diagnostics to retrieve DTCs or perform SYMPTOM
TESTS. Diagnostic system check may indicate that system is functioning
properly.
RETRIEVING DTCS
Connect Tech 2 scan tool to DLC located under steering
column. Access 4WAL brake DTCs. Repair DTCs in the order they appear.
See 4WAL DIAGNOSTIC TROUBLE CODE (DTC) table for diagnosis. Before
diagnosing DTC(s), perform DIAGNOSTIC SYSTEM CHECK.
4WAL DIAGNOSTIC TROUBLE CODE (DTC)

SC

[agcneo]

wow, thanks!