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2004Ford Econoline 350 brake problem

I have good stopping power with this van but after you hold the brake pedal down for 10 seconds or so the pedal drifts on down not quite to the floor. It has new pads all the way around and I have put 2 new master cylinders on but it keeps doing the same thing. It isn't leaking anywhere. Any thoughts?

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  • timmy2toesri May 11, 2010

    I don't know if this will help you? I would check the gromet seal for the vaccum line on the booster.Good luck. Tim

  • timmy2toesri May 11, 2010

    I hope this can help you.I would check the gromet seal for the vaccum line on the booster.Good luck.Tim

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  • 7 Answers

SOURCE: 2001 Mustang GT rear brake job

yep this is a two man job, onece you get air in the lines is better to do all four, my has abs and i was able to do it, but next time don't take anylines lose just turn the piston clockwise and you should be able to push it in.

Posted on Oct 12, 2008

  • 65 Answers

SOURCE: 2005 f150 spongy brakes

it sounds like your still not getting all the air out of your lines. it helps to have a brake bleeder but they are expensive, it also could be that the gasket inside the master cylinder is inverted even if it is a new master cylinder this could be the case, ive had four bad remanned ones in a row, before i got a good one... hope i could help

Posted on Mar 24, 2009

  • 1779 Answers

SOURCE: bleed brakes but no pedal

Good! You bled the master cyl. before installation! The proper order of bleeding the lines, is to start with the wheel the greatest distance from the master cylinder. Then work your way to the next greatest distance, and last, the closest wheel. Make sure all air is removed from the lines before you proceed to the next wheel, and frequently check the master cyl. level, because, as I'm sure you know, if you **** in air at the master, you have to start all over again. I'm assuming you don't have a power bleeder, so with a helper do this with car running (make sure it's on safety stands and not going to fall on you!) Pump pedal 3 times, no need to mash the pedal into the floor, just 3 pumps 1/2 way down, hold 3rd pump at half way down level while bleeder is opened, when flow is about to stop at bleeder, close bleeder and repeat til no evidence of any air. Let me know how it goes and if you need any help.

Posted on Apr 21, 2009

  • 21 Answers

SOURCE: brake pedal keeps creeping down, but there are no leaks.

check your brake booster and also make sure the rear shoes are adjusted up where they belong. If they are not adjusted up the brake pedal will go farther and farther toward the floor and get spongier as they go farther out of adjustment. If you adjust them up and they back down again change your self-adjusters and springs. They are readily available at your local parts store.

Posted on May 10, 2009

emissionwiz
  • 70374 Answers

SOURCE: brake pedel pushes to the floor

pump the pedal about 10 times and see if it comes back up, u need to pump the caliper pistons out after a brake job.

Posted on Jun 27, 2009

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2 Answers

How do you know that a brake booster is bad?


Booster problems are rare but they do go bad sometimes.
A bad booster generally causes the brake pedal to feel hard to push down, and a lot of pressure on the brake pedal is required to make the car stop.
Rarely, a vacuum brake booster will develop a vacuum leak, which can cause engine performance problems, hissing or whistling noise, as well as requiring increased pressure on the brake pedal to stop.

The first test:
With the vehicle parked, turned OFF, and the parking brake set, pump the brake pedal 5 to 6 times. If the pedal gets harder to push after several times, your booster is probably good.

The second test (To make sure):
After the test above, without making any changes, press and hold the brake pedal with light to moderate pressure.
Now with your foot still on the brake pedal, start the vehicle.
If the booster is good, you will feel the pedal go down when the engine starts.

Hope this helps!

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i suggest a bad master cylinder, but 1st answer this, when you apply brakes firmly and keep pressure on the brake pedal, does pedal go down while you're holding pressure on the pedal? if so, the master cylinders bad. and also have you checked the vacum to the brake booster?

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