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Alrighty guys, I’ve searched low and high and in every nook and cranny with no answers. For some reason my right front disc brake caliper key and spring like to eject themselves, leaving my caliper dangling inside the wheel while I’m driving. I’ve replaced them about 7 times now, even bent the spring so it would push the caliper more. I just can’t seem to wrap my head around it. What do you guys think?
I had the same problem on my '79 F250. I replaced the key and spring several times as well to no avail. I ended up replacing the whole caliper and have not had any problems since. I suppose there was enough wear that it was out of spec enough that the key/spring was too loose.
That’s what I was worried I would have to do. Nards. We’re getting snow tonight and I don’t particularly enjoy the idea of bleeding breaks in 4 inches of snow haha
F100/F150 F250 2wd 4wd...single piston/duel piston? A little more info helps. But in reality it is pretty much the same set up through out. X2 on just want to make sure you are using the correct shouldered head type bolt (key retaining screw) installed in the 1/2 moon cut out of the caliper support key. Also are you installing the caliper support key correctly? 1/2 moon cut out facing down?
F100/F150 F250 2wd 4wd...single piston/duel piston? A little more info helps. But in reality it is pretty much the same set up through out. X2 on just want to make sure you are using the correct shouldered head type bolt (key retaining screw) installed in the 1/2 moon cut out of the caliper support key. Also are you installing the caliper support key correctly? 1/2 moon cut out facing down?
Yes, it’s dual piston. And yes I have replaced the bolt. And lastly yes, it is installed correctly. That’s why it’s baffling me. Next I’ll replace the caliper itself because it has a little play even with the key and spring in place.
Yes, it’s dual piston. And yes I have replaced the bolt. And lastly yes, it is installed correctly. That’s why it’s baffling me. Next I’ll replace the caliper itself because it has a little play even with the key and spring in place.
DING DING DING, we have a winner!
If you have a bit of play with the key and spring in place it's either the caliper or 2B292 in ND's diagram (or both) that have enough wear to allow that play. That exactly the problem I had that the caliper fixed. After replacing the caliper I had to tap the key and spring in with a hammer.
If you have a bit of play with the key and spring in place it's either the caliper or 2B292 in ND's diagram (or both) that have enough wear to allow that play. That exactly the problem I had that the caliper fixed. After replacing the caliper I had to tap the key and spring in with a hammer.
Makes sense. I was told it should be hard to get the key and spring in, but I can push it in by hand. Hopefully the caliper will fix my problems. Looks like I get to bleed brakes in snow!! Haha
What happens to the bolt when the caliper self-ejects? Does it stay in place and the key somehow gets around it? Or does the bolt break or come out?
In some cases you can still be good but be able to install the key and spring by hand. But it's never an "easy" push. It still should take some muscle and things should still be tight.
More often than not though, so probably the correct sequence, you have to tape the key in with a little persuasion.
On the flip side of that, if it takes more than hard taps with a hammer, something else is wrong.
Never seen that with the dual-piston calipers, but have seen people buy new parts kits for the single piston version and get the wrong size key and spring. I was trying to put them in and had never seen one that tight. Knew something was wrong so went looking for an old one (but known good one) and sure enough, they were different sizes.
Never heard of a different model, but either they existed or the parts suppliers were using the wrong interpretation of the specifications to make their parts.
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