Rotors- how warm ?
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Laughing Gas
Joined: Feb 2004
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From: west plains spokane,wa
Rotors- how warm ?
Long story short, I had a tire chain break & tear up brake pads & rotor on the front of my 93 f250. Went ahead & replace bearings, rotor, caliper & pads while I was at it. This was passenger side, only did pads on drivers side. I had replaced caliper & rotor last year. Anyway after test driving it for about 5 miles at 45mph I returned home and felt the hubs & rotors. Hubs were cool but rotors were fairly hot, almost too hot to touch on both sides. Did a couple test stops, pedal felt right. Wheels turn ok, just a tad of resistance. Never checked my rotors after driving, is that normal they get pretty warm with hardly any braking?
Junior User
Joined: May 2017
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Yes, especially with new pads.
[The pads are always in contact with the rotors, even when you aren't braking. That light friction causes heat. It's why your rotor faces have a heat sink between them and your wheel rims have holes in them to disperse the heat.]
[The pads are always in contact with the rotors, even when you aren't braking. That light friction causes heat. It's why your rotor faces have a heat sink between them and your wheel rims have holes in them to disperse the heat.]
Hotshot
Joined: Jun 2015
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First I've ever heard of that. How do you explain solid brake rotors and steel wheels without holes?
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Laughing Gas
Joined: Feb 2004
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From: west plains spokane,wa
I checked my son's truck, same year but a 350 this morning. His rotors got pretty hot (uncomfortable to touch) after a 15 minute drive, his were done by a local mechanic last fall.
Junior User
Joined: May 2017
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I dunno....
https://motofaction.org/mechanical-101/what-is-the-difference-between-a-vented-and-solid-brake-disc-or-rotor/
Tech Article: Brake Cooling Singular Motorsports
More surface area (fins in rotor) = greater heat dispersal. That's just physics.
I heard long ago, like in the late '70s and '80s, when people used Cragar solid aluminum rims they had brake fade issues. Fine on Friday Night cruisers and dragsters with a parachute or three strapped on their butt. Problematic on daily drivers.
I'm cool with it though. Trust but verify. But just cuz you haven't heard of it, doesn't mean it isn't so.
https://motofaction.org/mechanical-101/what-is-the-difference-between-a-vented-and-solid-brake-disc-or-rotor/
Tech Article: Brake Cooling Singular Motorsports
More surface area (fins in rotor) = greater heat dispersal. That's just physics.
I heard long ago, like in the late '70s and '80s, when people used Cragar solid aluminum rims they had brake fade issues. Fine on Friday Night cruisers and dragsters with a parachute or three strapped on their butt. Problematic on daily drivers.
I'm cool with it though. Trust but verify. But just cuz you haven't heard of it, doesn't mean it isn't so.
Cargo Master
Joined: Mar 2010
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From: Laramie, WY
I had a dragging drum (I adjusted it a touch too tight). Used an IR gun to check temperatures after a drive with minimal braking. If I recall correctly, the "normal" temps were in the neighborhood of 150F. That's a bit hot to touch for long, so it sounds like your truck is about the same. I'd consider it normal. I get around 60k miles to a set of pads.
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Cargo Master
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From: Laramie, WY
What makes you think that?
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Lead Driver
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From: Rhode Island
Your brake rotors will always be hot after a drive, especially a spirited drive where you're testing out your new brakes. The rotors have fins between the two surfaces to help dissipate heat. Wheels with holes aid this process. Solid rotors are generally only used in low speed, lightweight or rear-wheel applications where the braking load is low.
Junior User
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This, but then I saw it was the OP doing an analytic diagnostic check. My apologies.
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Laughing Gas
Joined: Feb 2004
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From: west plains spokane,wa
I had a dragging drum (I adjusted it a touch too tight). Used an IR gun to check temperatures after a drive with minimal braking. If I recall correctly, the "normal" temps were in the neighborhood of 150F. That's a bit hot to touch for long, so it sounds like your truck is about the same. I'd consider it normal. I get around 60k miles to a set of pads.
Cargo Master
Joined: Mar 2010
Posts: 3,326
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From: Laramie, WY
And yes, the brakes need to dissipate a lot of energy as heat. Solid rotors are likely a cost saver used in certain applications only where performance isn't a primary objective.
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