Question about Ford Thunderbird

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I just replaced my master cylinder on my 1994 ford thunderbird LX with a 4.6L V8. But my brake pedal is still going down to the floor board. What could be the cause of that?

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You've bled the lines from back to front, and bled the master cylinder/ It sounds like air in the lines, so you should be able to get streams of fluid with no air at all bleeder screws-start from the furthest away from the master cylinder, to the closest, then do the master cylinder. If that doesn't work, you must have a broken line or a leaking caliper or wheel cylinder.

Posted on Jan 04, 2011

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You will have to use a cross corner bleeding patern

Posted on Jan 04, 2011

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HI,did you bench bleed the master cylinder,before you in stalled it. Then if you did bench bleed master cylinder, did you bleed all brake lines starting at right rear then left rear,then right front,then left front wheel. You have to do all this to get all the air out of lines,and also have you check for any leaks on brake lines,plus wheel cyclinder , bad brake hoses on hoses they also could be roten on the inside not letting fuild flow. If i can help you any more just re post .
Thanks dodge tec

Posted on Jan 04, 2011

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1 Answer

Just the other day my brake pedal starting going almost to the floor before the brakes activated... checked brake fluids and its full but i boticed that if the car wasn't on that the brake pedal acted...


Given the age of your vehicle and that you do not see any fluid loss, the most likely reason for the brake peddle act this way is because of an internal leak in the master cylinder.
The master cylinder has a piston the operates the brakes when pressure is applied from the peddle. Basically, this piston provides and maintains the fluid pressure because of rubber "O" rings or seals. If the seals are going bad (due to age and wear) the fluid will bypass the piston but still stay in the cylinder and reservoir.
The master cylinder can be rebuilt or new one cost $65-$120 depending on if you have anti-lock brakes. Here is a link to a supplier (with part photos) (Click Here) Labor about 2-3 hours.
J

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Mar 12, 2011 | 1994 Ford Thunderbird

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I put new brake pads on my 94 ford explorer and i forgot to test the truck last night and this morning i was about to go my job and i have no brake pressure and me and my dad tried to bleed the brakes to...


When you pushed the pistons back into the caliper so the new pads fit over the rotors did you look an see how full the master cylinder was ? You did push the pistons in didn't you ? Over flowed from master cylinder ? After replacing pads you didn't pump up the brakes ? The pedal will go to the floor but should pump up . Just replacing pads wouldn't make the master cylinder go out . How was the pedal before your brake job ?

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Pull the vacuum hose off the booster. Disconnect the brake lines from the master cylinder. Remove the master cylinder. Remove the windshield wiper motor if it's in the way. Inside the car, disconnect the stoplight switch connector. Slide the stop lamp switch off the brake pedal just far enough for the outer arm to clear the pin. If you have cruise control, remove the speed amplifier. Remove the booster attaching bolts/nuts. Slide the booster pushrod, bushing and the nylon washer off the brake pedal pin. In the engine compartment, pull the booster forward and rotate it until it is free. Good luck!

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The brake pedal goes all the way down to the floor board


You need a master cylinder if you inspect the wheel cylinders for leaks and find none or check the fluid level and its full.

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Break peadle wont hold pressure


U are going to need a new brake master cylinder, the internal seals are leaking and allowing the fluid pressure to leak down, this why the sinking pedal

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2 common causes for this are air in the, system, and pads are worn down causing the calipers to go furthur out thus reducing pressure (disc brakes)plz rate-bozcro

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My vote would be the Master Cylinder.
I had a truck sit for 4 years. After getting running again, it did the same thing you're describing. No brakes. I ended up replacing the Master Cylinder to fix the problem. Just make sure you bleed the system real good.

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