ABS Issues on Marauder Truck

[MarauderPU]

I have a 63 Unibody F-100 (I am making it an M-100 with a Marauder theme) sitting on a 2003 Marauder chassis. I have all of the stock brakes on the truck, but we cannot get a firm pedal. As soon as the motor is turned on the brake pedal goes to the floor. I have noted that other owners have had this issue on brake bleeding and clearly-you need a scanning tool to make sure the system is bled properly. The system has been bled with a scanning tool in the right sequence by a good mechanic and the pump does come on and it pumps fluid out of each respective caliper. But I still have no pedal once the engine comes on. My Mechanic thinks the ABS unit is faulty.

I have two questions.

Question No 1. Is there a way to tell if the ABS unit is Faulty?

Quesiton 2 How do I tell if this car came with Traction Control? I know there is a button on the dash but the car is long gone. When looking for new and used ABS units they list two different units and part numbers--one with and one w/o traction control. Are there easy ways to identify if I have TC or not have it? I have installed all of the original wiring harness but I have not plugged in every last connector into every last switch.

My mechanic thinks the pump or module is bad but yet it does run with the scanner.

Help

[FordNut]

Maybe air in the lines. It's really hard to get the air out of the ABS system lines without the power bleeder they use at the dealership.

[MarauderPU]

We used a power bleed (presurized the master cylinder) and the process using a $4,000 scanning tool which all appear to have been completed properly.

[SpartaPerformance]

We used a power bleed (presurized the master cylinder) and the process using a $4,000 scanning tool which all appear to have been completed properly.


Keep bleeding it using that tool and proper procedure, you're going to have to run around 4 - 5 standard sized bottles of brake fluid through to get a firm pedal if you let the ABS HCU get any air into it.

[MarauderPU]

Thanks for the response. Doesn't that seem like an insame amount of fluid? Sounds like you have done this before.

So you think it's not a malfunctioning ABS? Question--will the brakes work at all if the ABS pump does not?

thanks

Karl

[SpartaPerformance]

IF you still have air in the line the pedal will fade, however once the air is bled out and the ABS module does not work the brakes will work like a car without ABS.

[Blackened300a]

Have you confirmed its not a bad master cylinder? Do you see air bubbles in it when you are pumping the brakes?