I had this problem on my 940. It started as a slight shudder when I braked, and then there was an intermittent clunk. Then, without any warning, both of the front brakes fell off (Completely. They were dangling by their cables!). It turns out that the bolts holding the brake system on had vibrated themselves out. Try tightening the bolts and see if that helps.
No gas in the engine
in the bee stinger that will attract other bees and causes problem.
you need to check to see if your caliper is hagiong up It is more likely to be a rear drum brake problem than a front caliper problem. Make sure your shoes are not oil soaked or way out of adjustment.
The brakes could be hanging up. caliper, or hose problem.
Take off shudder is most commonly caused by one of three things. Broken motor mounts, a broken transmission mount, or bad u joints will all cause the shudder.
The brake caliper or the sliding rail for the caliper may seize up. You should take out and lube the sliding rail on every brake job. This seem to be the most common problem. Try to relube and see if it will fix the problem.
ive had a couple of work trucks over the years which started to shudder. both needed auto transmission work.
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I just had the same problem with my 1994 Ford Thunderbird, to make a long story short, the torque converter was bad. Mine had gotten really bad and started making a rattling noise. At any rate after I finished the change, it runs like a champ. No more shudder.
Warped rotors
Ford had a problem with the pistons in the caliper becoming out of round and not being able to return to the released position when the brakes are released. The piston keeps pressure on the pads and causes drag on the rotor. Not saying this is the problem as it could be as simple as a broken down hose not letting the fluid return to the master cylinder. Open the bleeder screw to release any pressure in the caliper and see if it fixes the problem temporarily. If it does, replace the hose. If not, replace the caliper.
Could be lots of causes, but most likely either rear differential issue or torque converter shudder in automatic transmission, though Ford is not nearly as common to have transmission shudder as a Chrysler is. Mine was the rear differential. (98, 5.4l). Mine was most pronounced when accelerating around a corner. Transmission shudder would most likely show up on acceleration at any time.