1993 Ford Ranger BRAKE PEDDLE GOES TO THE FLOOR

Tiny
AVIANSPIRIT
  • 1993 FORD RANGER

Brakes problem
1993 Ford Ranger 6 cyl Four Wheel Drive Automatic 72000 miles

I replaced the front calipers and pads, replaced the master cylinder, bench bled it before installation, bled brake lines in this order RR, LR, RF, LF and my brake pedal still goes right to the floor. I do have ABS rear brakes. Could there be air in the ABS sending unit? HELP! It looks like there is a bolt there for bleeding or draining fluid.

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Saturday, February 6th, 2010 AT 9:02 PM

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Tiny
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The RABS valves do leak internally and may well be the problem, but try bleeding it first You do need to bleed that valve first before doing the wheels in the order that you are doing them.

IF this doesn't resolve it then we need to see if this is an internal or external problem. Loose fitting/connection that is allowing bleed back or internal leakage.

You can get plugs for the ports in the mastercylinder. Remove the lines and plug those ports. The pedel should be rock hard. IF you don't get that, replace the mastercylinder. I have had issues with new ones right out of the box. Most often the reman ones, rarely on new ones.

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Sunday, February 7th, 2010 AT 6:54 AM
Tiny
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The RABS II master cylinder and hydraulic control unit must be bled using Anti-Lock Brake Adapter tool No. T90P-50-ALA and Jumper tool No. T93T-50-ALA or equivalents. If this procedure is not followed, air will be trapped in the hydraulic control unit which eventually leads to a spongy brake pedal.

Bleed system as follows:

Place bleed/harness switch on bleed adapter tool to bleed position.
Turn ignition switch to On position. At this point, the red OFF indicator should turn on.
Push motor button on the adapter down. This starts the pump motor.
The red OFF indicator turns off and the green ON indicator will turn on.
The pump motor will run for 60 seconds once the motor button is pushed. If the pump motor is to be turned off for any reason before 60 seconds has elapsed, push the abort button and the pump motor will turn off.
After 20 seconds has elapsed, push and hold the valve button for 20 seconds. This will bleed any trapped air from the master cylinder and hydraulic control unit.
The pump will continue to run for an additional 20 seconds after the valve button is released.
Bleed primary and secondary hydraulic brake systems separately, bleeding the longest line first on each system. Do not allow reservoir to run dry during bleeding operation. Never reuse fluid that has been drained from the hydraulic system.

Loosen master cylinder to hydraulic line nuts and wrap shop cloths around tubing below fitting to absorb escaping brake fluid.
Depress brake pedal slowly forcing air trapped in master cylinder out at fitting.
Hold pedal down and tighten fittings, then release brake pedal. Releasing brake pedal before fittings are tightened will allow air to enter the master cylinder.
Repeat steps 1 through 3 until air ceases to escape at fittings and brake pedal is firm.
Bleed rear brakes as follows:
Pump pedal several times, then hold pedal down firmly.
With pedal firmly depressed, open bleeder screw on one rear brake until pedal fades, then close bleeder valve.
Repeat procedure until a continuous flow of brake fluid is released from bleeder valve.
Repeat steps 5a through 5c on other rear brake.
On vehicles equipped with rear anti-lock brakes, bleed the RABS valve.
On all vehicles, bleed the front brakes using same procedure as for rear brakes.
Fill master cylinder to 1/4 inch from top of reservoir or to the proper fill line indicated on the fluid reservoir.
Centralize pressure differential control valve, if applicable, as follows:
Turn ignition switch to ACC'' or On'' position.
Push brake pedal down, allowing piston to center itself, turning off warning light.
Turn ignition switch off position.
Check brake operation and ensure pedal is firm, then road test vehicle.

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Monday, February 8th, 2010 AT 7:36 AM
Tiny
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This is the procedure from the manual. You may need a tool to do this.

You can also bypass the rabs valve if you don't care about the abs functioning.

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Monday, February 8th, 2010 AT 7:38 AM

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