Electronics > Projects, Designs, and Technical Stuff

Best sensor scheme for hot brakes?

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SparkyFX:

--- Quote from: Benta on June 28, 2020, 09:58:55 pm ---Don't want to step on your toes, but perhaps you should review your driving style? I've never heard of this problem before, cold climate or warm climate. Brakes don't just "drag and get hot" unless they're defective, and then they should be fixed.

Are you driving with both feet on the pedals? (assuming auto trans).

--- End quote ---
That shouldn't damage neither the piston nor the pins. Brake rotors might get an axial runout and pads wear faster.

The question is if the actual problem is all around or just the rear axle and if there is actually more damage to be seen than just wear (actual damage on piston or pins).

Given a modern brake system engages the park brake via the main brake pads and has a self-adjusting mechanism for the rear axle, there might be several reasons for stuck brakes after parking. Environmental factors should not be an issue if only rear brakes have the problem, as these affect both axles (excluding the bowden cable for the park brake).

One lesser known issue are problems with the self-adjusting wear compensation due to vibrations, which means the calipers close tighter than they should and can only be manually retracted (rotate them back in) when taking the pads out. As this is done when changing the pad (you usually can't reassemble new pads without doing so), it is considered "normal" but might as well be the cause.

Conrad Hoffman:
I've had the problem on all four corners at one time or another. Everybody I talk to says it's only me, so apparently I'm "special". The brakes were just serviced within the last year or so by very competent people. They replaced at least one caliper then for the same reason. The fluid was completely flushed with LMA fluid. I think it's a combination design issue and environmental issue. I also think a lot of people are driving around with slightly dragging brakes and don't know it. I like Thermoworks IR guns but none are on sale right this minute. Next time they do go on sale, I'll pick one up and start keeping records. BTW, if you do electronics, their CF-IR unit is great for small areas like chips, resistors and heat sinks.

ejeffrey:

--- Quote from: Benta on June 28, 2020, 09:58:55 pm ---
--- Quote from: Conrad Hoffman on June 27, 2020, 11:26:57 pm ---May or may not build something but the last couple cars I've had tend to develop dragging brakes after a while.

--- End quote ---

Don't want to step on your toes, but perhaps you should review your driving style? I've never heard of this problem before, cold climate or warm climate. Brakes don't just "drag and get hot" unless they're defective, and then they should be fixed.

--- End quote ---

I don't think Conrad is arguing that it isn't a defect.  The point is to monitor so that it can be noticed and repaired when it happens, similar to how TPMS is (supposed) to work.  I have never heard of this being a common enough problem to warrant such measures, but then it isn't clear how I would have noticed if the only symptom is a few mpg worse fuel consumption and your brakes running hot even while cruising.

SilverSolder:

I ususally notice it by the smell, or the ticking sound of brakes cooling -   like after you've driven a car hard.  (Not that I would ever do that, of course.)

SilverSolder:

--- Quote from: Conrad Hoffman on June 30, 2020, 02:14:20 pm ---I've had the problem on all four corners at one time or another. Everybody I talk to says it's only me, so apparently I'm "special". The brakes were just serviced within the last year or so by very competent people. They replaced at least one caliper then for the same reason. The fluid was completely flushed with LMA fluid. I think it's a combination design issue and environmental issue. I also think a lot of people are driving around with slightly dragging brakes and don't know it. I like Thermoworks IR guns but none are on sale right this minute. Next time they do go on sale, I'll pick one up and start keeping records. BTW, if you do electronics, their CF-IR unit is great for small areas like chips, resistors and heat sinks.

--- End quote ---

One of my collection of elderly vehicles is a hybrid, which gets a lot less use of the brakes than a gasoline car due to the regenerative braking.  Here, the big problem is rusting brake disks due to lack of use...   I have to buy the best, coated disks, and I'll still have to change them after about 3 years due to rust.  If I buy the cheap disks, they are junk in one year!  Got to love road salt etc.

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