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3.0d, Rear brake disc heating up (right only)
So, I've been having this problem for a while, and I wanted to ask for advice before I start changing everything, part by part. As the title says, my rear right brake disc is heating up more than the rest of them. It gets to be even 50-100 degrees Celsius warmer on certain spots (if I measured well, it is after the caliper) than the left one. If I drive longer routes (let's say, 30+ min drive), it gets hot, so you can hear squeaking and scraping noise coming from the rear right, and the right wheel gets warmer than the left (of course, you can't touch the brake disc itself). Important to mention: I changed handbrake pads (ATE), brake discs (ATE Power), brake pads (ATE), and brake fluid (ATE Typ 200 DOT 4) six months ago. I'm suspecting (and hoping) it is just the right rear caliper. However, when you lift the car, put it in neutral, and spin the rear wheels by hand you don't feel much of a difference. We cleaned the caliper again, but no difference. Also, I eased up the handbrake pads on the right side (right cable also), so it seems it's not them (plus, the hottest spots I measured are after the caliper. Before the caliper the temperature seems to be normal). What do you guys think? 1. Would you also first go with changing the caliper?I appreciate your suggestions before I start blindly changing part by part.
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BMW E46 318d '03 BMW E53 3.0d '06 |
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#2
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I would say it's a good bet that the caliper is starting to seize/drag. Did you notice anything when you spread the calipers to install the pads?? Are you sure there is no air in the hydraulic system? Caliper pins are good? A warped or bent rotor won't cause that problem. Wheel bearing would make lots of noise long before anything else.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 02-17-2024 at 09:38 AM. Reason: add |
#3
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Current Original owner 2002 E53 X5 4.4i to 4.6i swap 2025 G06 X5 50e Former 1972 Audi Fox 1986 Saab 900S 1996 BMW Z3 1998 BMW E36 M3 Sedan 2004 BMW E46 M3 2006 Audi A3 Quatro 1993 Mopar 318 Jeep Grand Cherokee 2015 V6 Jeep Grand Cherokee |
#4
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If it gets that hot I would expect the car pulls to the right when you drive. Is that the case at all?
Either way taking the caliper off, inspecting the pads and rotor, will probably tell you the culprit.
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2003 3.0 5MT Topasblau Purchased in 2016 and surprisingly still running 2012 35d Platingrau |
#5
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Quote:
And if I remember correctly, the caliper pins also look fine. Just by looking and spreading the calipers, we did not notice anything odd. Everything looks as it should be. My guess was also that it is less likely a rotor or wheel bearing. What about the bad pads? Is it possible that the right one is just thicker than it should be? Quote:
If the problem persists, then definitely the lines maybe... Quote:
And no, it doesn't pull, because it is the rear rotor. And I noticed that it heats up only because I started to hear the noise coming from the rear right wheel, and I noticed a higher temperature in the right rear tire. Anyhow, last time we took everything off, cleaned the caliper again, and tried to spread it... Everything seemed okay. But it isn't. So, I will try with the other set of calipers first. And the handbrake pads? I believe they would heat up the entire disc a bit more evenly. It wouldn't be the hottest after the caliper?
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BMW E46 318d '03 BMW E53 3.0d '06 |
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You didn't happen to grease your glide pins, did you?
Did you bed your brakes when you 1st got it back together? When it's cool, do you feel any groves or waves on the rotor or did you turn the rotors when you did the brakes? Sent from Embassy network using Tapatalk
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
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I didn't do the work, the mechanic did it.
And if you mean did he bled the brakes, yes he did. And when it's cool, no, the rotor seems pretty fine. However, I didn't send it to be checked. What do you mean when you say if I turned the rotors? You mean if we tried to switch left and right?
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BMW E46 318d '03 BMW E53 3.0d '06 |
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#9
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Bedding..... https://brakeperformance.com/bedding-in-rotors.php Turning a rotor is described above and gives you a new surface for the pads, plus it will show if it's true or too thin to use without warping. Sent from Embassy network using Tapatalk
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
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Silver 2006 BMW X5 3.0i Auto |
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