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Brakes Rusting Together After Rain

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#303 ·
It just the way the pads works. Ceramics has to be heated up initially otherwise they might feel not grabbing good enough. That's how I will do it and I did it on both XC90.
 
#304 ·
XC90_Dinosaur said:
It just the way the pads works. Ceramics has to be heated up initially otherwise they might feel not grabbing good enough. That's how I will do it and I did it on both XC90.
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I think you missed what I was saying. Not using opd does not result in the pads being used more than not using opd and therefore they will not be warmed up more.

Braking hard would result in the heating you talk of. Hard being defined as greater than the regenerative threshold.
 
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#305 ·
XC90_Dinosaur said:
It just the way the pads works. Ceramics has to be heated up initially otherwise they might feel not grabbing good enough. That's how I will do it and I did it on both XC90.
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‘I need to let these brakes bed a bit. I have to look I thought they want some hard stops initially to bed them. It does seem possible a little soft right now, but I just drove an ICE loaner. And soft in the rear would be fine as it will force more regen. I do recall my ceramics on my Audi felt softer, but as long as you leaned into brakes they gripped. It will be interesting as alls pad s have trade offs. According to Powerstop these have more grip than factory pads. Not sure how they calculate that since these pads are used by numerous models.
 
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#306 ·
SeattleCat said:
I think you missed what I was saying. Not using opd does not result in the pads being used more than not using opd and therefore they will not be warmed up more.

Braking hard would result in the heating you talk of. Hard being defined as greater than the regenerative threshold.
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Don't know haw much heat will be generated with OPD. Perhaps hard breaking the way you mentioned will work.
 
#307 ·
The same heat as non opd without breaking hard.
Wish regenerative could be turned off for 30 seconds.
 
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#308 ·
He Keith said:
‘I need to let these brakes bed a bit. I have to look I thought they want some hard stops initially to bed them. It does seem possible a little soft right now, but I just drove an ICE loaner. And soft in the rear would be fine as it will force more regen. I do recall my ceramics on my Audi felt softer, but as long as you leaned into brakes they gripped. It will be interesting as alls pad s have trade offs. According to Powerstop these have more grip than factory pads. Not sure how they calculate that since these pads are used by numerous models.
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Heat them very well. Apparently the ceramics will deposit thin layer on the rotors to make them grip even better. That layer will make rotors bit more rust proof.
 
#309 ·
Very off topic. But I wonder if we can install the brembo break system installed on the polestar and Volvo polestar performance vehicles.
Might be a good aftermarket option to think of.
 
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#310 ·
B-mtrd said:
Very off topic. But I wonder if we can install the brembo break system installed on the polestar and Volvo polestar performance vehicles.
Might be a good aftermarket option to think of.
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That is a very good point. It is very possible to work. Unfortunately any alterations will be happening after 4 years or 80,000km.
 
#311 ·
I find it funny and concerning that after driving 43 years and never having to give brakes a second thought as they were just there and worked, we have to theorize ways to prevent our brakes from being a problem. That alone says Volvo has a problem they need to fix. Worrying about if the brakes are dry, warm enough, doing hard braking before parking after washing, etc. are all signs that the Volvo design is flawed. I should have some decent evidence in 2-3 weeks after these ceramics bed and I have washed the car a few times.

I have been clear to the dealer and Volvo that I have been consistently conflicted with this car.I love it, but the brakes want me to have them buy it back and the on,y thing that stopped me was the great customer service from the dealer and the Volvo rep. A different rep or dealer could easily have resulted in me filing the lemon law paper work and them buying the car back. What these 2 people have done have convicncec me to double down by getting ceramic paid and ordering a second car to replace her ICE T5. Volvo the company did not do this, my dealer and Volvo rep did as Volvo has always just pushed me to the dealer.
 
#312 ·
Thanks for documenting your experience on this. I had the same issue occur yesterday - two days after I parked in the garage at the end of a drive in heavy rain. Very loud (and fairly embarrassing on a new car) "thwomp thwomp thwomp" that you could feel through the seats as we drove away from the hose. It freaked my wife out, but I'd already seen this thread and just let out a sigh of disappointment. After ~10 miles of driving, it feels normal again. ~500 miles on the odometer.

For anyone who thinks this is a problem of car washing technique: If Volvo intends to sell these cars in the US Pacific Northwest (where it rains a lot and a drive isn't guaranteed to dry out anything), they're going to have to address this.

Luckily (unluckily?) I have a service appointment booked for failure to get the OTA, so I'll add a rear pad inspection to the list. Won't be able to get it in until next month since I requested a loaner.

I look forward to updates on the ceramic pads.
 
#316 ·
SeattleCat said:
Well that answers that question :) I wonder what is different about the Volvo.
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Yeah, I suspect it's just the pad/rotor combo not being suited to the use case (components that don't heat up as much, etc). I drove those other cars in exactly the same conditions, parked in the garage with the parking brake on, etc. So lucky for Volvo, there are plenty of examples of cars that get this right - it should be rather trivial for them to figure out what they're doing differently.
 
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#317 ·
I have it on my to do list to look at the previous service bulletins and see if something g comes up on rear break pads or all overall break pads.
Hard to do on weekends with a 5 and 10 year old jumping all over me.
 
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#318 ·
SeattleCat said:
Well that answers that question :) I wonder what is different about the Volvo.
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The Volvo uses a metallic pad. My guess is the type and amount of metals and they are clearly chemically reacting with the metal in the rotor when moisture is present when parking brake is engaged. If you hear noises while driving after the clunk thatmeans the pad is damaged. Even if it goes away over time of driving or braking, the pads have damage and are compromised. Is it dangerous? Beats me , but I am not risking it. That is why I encourage anyone that has this issue to file a NHTSA complaintso hopefully that helps push Volvo to a TSB or recall.
 
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#319 ·
At this point..... there should be a RECALL. Better now than later.....
  • There shouldn't be such "surprising" driving experience for anyone after a "wash" or "rainy day" for a brand new car. Before the car was towed after 15 miles of "thudding" all the way, i still had a friend crawl under the car to see if anything was "stuck" somehow.
  • There shouldn't be a paranoid routine of wash car - dry/or not - apply brakes - x minutes...HUH?
  • No owners should be left wondering whether this a "norm" for an EV or just P8 issue
  • Anything "brakes" or "rotors" related screams "SAFETY" to me....shall not be something to be dismissed
 
#320 ·
They can't recall until they have a fix. I suspect there will be a TSB once they have a new pad. Push your dealer to put the ceramic pads on that I got? I doubt Volvo will pay for the pads, but to me $50 was worth piece of mind that hopefully this is over. If theses stick then car will be bought back as I have ll the lemon law stuff ready to send.
 
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