Issue After Replacing New Brake Discs & Pads: Rims Hot, Pads Rubbing Against Discs Unintentionally

Question

I replaced the brake discs and pads with new ones, after driving a few km, I saw that my rims were hot. I understand that the pads are rubbing against the discs even though I am not braking. what's the problem?

barubar · Answer

The problem is that they got hot. If you can repair the brake system, you understand how it works and you can diagnose it, right?

wojtek.k55 · Answer

Well, but what to do to prevent them from heating up. If I have not lubricated the cylinders with a special grease, it can cause blocking and constant pressure on the blocks?

barubar · Answer

And they block? Did you lift the front end after riding and check? Are you sure that the bricks have made it to the discs for a few kilometers? The blocks are loose in the guides? The pistons are easily retracted? You won't tell me that you drove the few kilometers after replacing the discs and pads like that, almost without braking. On the contrary, you probably braked many times to check your work ...

wojtek.k55 · Answer

So you say that such a situation is normal with the rims heating up after replacing the discs, before everything arrives?
When I stopped, the discs blocked, I had a problem to push the car in neutral.
The pistons are a bit hard, but I took them out and cleaned them a little.
I was braking a few times but then as I had to.

barubar · Answer

You can push the pipe while on the so-called easy. You are to raise the front and try to turn the wheel with your hands, grasping the tire. Did you take out the pistons, say, how did you clean them and what did you have to remove?

wojtek.k55 · Answer

The wheel turned a little hard. I wiped them with a soft cloth. I took them apart because I changed the brake fluid, because I do not know when it was made and the calipers were a bit of a mess.
Walked in a bit hard after cleaning. I did not have grease to mount the plungers but put them on high temperature grease.
Approximately how many kilometers should you travel through all of this?

barubar · Answer

Unfortunately, I am too thin to answer you. Wait for other colleagues. Good luck.

wojtek.k55 · Answer

while driving I felt that the blocks were rubbing against the discs all the time. Why do the pistons not return after releasing the brake pedal?
Does it matter how tightly you tighten the clamp with the screws?

kwok · Answer

if you pressed the pistons completely dry, although it seems impossible to me, this is probably the reason
disassemble again and if you do not have this wonderful lubricant, before pressing the plunger, lubricate the seal and plunger with at least brake fluid
there is also a possibility that the seal has rolled up when pressing the plunger and wedges the plunger because it got too thick between the plunger and the cylinder but these are just my guesses because I do not know your possibilities and I know that people have unlimited fantasy in connection with the lack of a clue or otherwise - if you do not undress you won't find out

barubar · Answer

Better not to undress anymore. Because it may be that soon there will be nothing to take from this brake system, or worse, from it.

wojtek.k55 · Answer

I didn't squeeze them dry. I think that some trash got into it and is now blocking it.

robokop · Answer

So it has to be. I close.

Issue After Replacing New Brake Discs & Pads: Rims Hot, Pads Rubbing Against Discs Unintentionally

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