Emergency/Parking Brake light issue - '97 F250HD - Page 2 - Ford Powerstroke Diesel Forum
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post #11 of 15 Old 08-26-2019, 04:27 PM Thread Starter
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Originally Posted by trevdalocal View Post
Does the light come on and off sharply, or does it kind of fade on/off? I had a bad brake booster that would allow a vacuum leak when you press the pedal, unless you held it down hard. If you gave it some revs to speed up the vacuum pump, the light would turn off too. New booster (and master too since I'm there) this weekend and brakes never felt better.
It comes on quickly when you stomp down fast and then just fades out. If you brake normally no light comes on at all, which is good, I guess. Since my last post I bled all the bleed points again pushing out a good cup full of fluid each. No air present at all five bleed points. Full solid brake with no pedal fade. If it's a vacuum leak it must be a small one. If I hold the pedal down hard, no light, only when I stomp it, comes on and then fades out.
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post #12 of 15 Old 08-26-2019, 04:58 PM
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Could be a brake booster issue. When you stab the pedal, the small tear or whatever in the diaphragm might burp in some air, and the light fades away as the vacuum builds up again. I would monitor the issue and see if it gets worse. Mine was to the point where you could hear it hissing when you held the pedal down, and it wouldn't have any assist on startup. That would make for fun starts on a hill... Need to fix up the parking brake, though I hear they're only half decent even in perfect order.

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post #13 of 15 Old 08-27-2019, 05:19 AM Thread Starter
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Originally Posted by trevdalocal View Post
Could be a brake booster issue. When you stab the pedal, the small tear or whatever in the diaphragm might burp in some air, and the light fades away as the vacuum builds up again. I would monitor the issue and see if it gets worse. Mine was to the point where you could hear it hissing when you held the pedal down, and it wouldn't have any assist on startup. That would make for fun starts on a hill... Need to fix up the parking brake, though I hear they're only half decent even in perfect order.
If my problem is the booster it's not bad enough to replace at this point. Thanks for the help, I appreciate the feedback and I will monitor. When my truck was new the parking brake worked great. Over the many years not so great, even after I changed the rear shoes. I don't think there is any adjustment you can do to make it better but, if you figure it out please post.
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post #14 of 15 Old 08-27-2019, 10:39 AM
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Yeah, probably need to get around to taking apart the rear and inspecting what's going on back there. Will definitely keep you posted if I discover anything!

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post #15 of 15 Old 08-27-2019, 11:31 AM
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I've always found that the self-adjusters don't always self-adjust that well (they do it when brake going backwards) . I always go and adjust the rear shoes manually through the backing plate holes, rotating the adjuster starwheels. If the parts are installed correctly, the starwheels will ratchet over the self-adjusting lever in the "tightening" direction, but if you need to "loosen" the shoe adjustment you'll need to use something to push the lever off the starwheel teeth to go in that direction. Cheers!

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