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P80 heavy braking smell, measured rotor temp 200F

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abscate
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P80 heavy braking smell, measured rotor temp 200F

Post by abscate » Sat Mar 09, 2019 9:12 am

After my near death ( ok, a bit hyperbolic) experience on I-90 this week, I tested my brakes again on an open road.

From 60 mph, a full pressure, Abs triggering stop on dry pavement in snow tires.

I get about 30 seconds of fairly strong hot brake smell after this, and could still smell it 3 miles later at home at wheel

Does that sound normal?

I guess I use full braking so rarely I’m lacking experience here. That’s probably good.


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Re: P80 heavy braking smell question

Post by ZionXIX » Sat Mar 09, 2019 11:40 am

Can confirm that heavy braking smells awful. Be sure that fluid is changed at least annually to avoid a reduced boiling point. Brake fluid boiling = 0 braking power. Old brake fluid will boil at a lower temp if its accumulated a lot of moisture.



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Re: P80 heavy braking smell question

Post by Sommerfeldt » Sat Mar 09, 2019 12:15 pm

Strong smell is more of a healthy sign than anything else. The pads have to really dig in before they get hit enough to kick up a stink, so that probably indicates that yours are in good shape. It also takes time to cool down the discs and dissipate the fried pad material.

Unless you feel the brakes fade quickly, the fluid is probably fine, but Zion’s advice is sound - if you can’t remember the last time, it’s about time. :)

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Re: P80 heavy braking smell question

Post by BEJinFbk » Sat Mar 09, 2019 1:58 pm

Got an IR thermometer?
Run the test again, then
walk around and shoot the
temps for all four corners.


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Re: P80 heavy braking smell question

Post by tardcart » Sat Mar 09, 2019 4:14 pm

I second the temp test, you can just put your hand on the center of each wheel. you will find one is hot. the caliper is so seized it only activates at full pressure and stays there for the ride home, giving the smell until the pads wear down. light breaking and its not moving.
there would be no smell from a panic stop but burned rubber. for some reason Volvos dont pull left or right with bad breaks like other cars do. Its not always the caliper. the break lines (rubber) can swell closed and not release pressure that forces by in panic stop. You can tell if you crack the bleeder and nothing drips out. dont worry about air going in. it won't if you dont move the peddle. I just bought two sets of Cardone rebuilt calipers no core and power coated for 25 bucket each shipped from Rock auto, but I see they now have only one side. Mine work great and dont rust. I dont know how to put the link in but you can go there easily. They say volvo on them. not rebuilt after market.



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Re: P80 heavy braking smell question

Post by Sommerfeldt » Sun Mar 10, 2019 5:40 am

If a caliper is seized, you should definitely feel it - even if the car isn’t pulling to one side, a caliper clamping to the point where the pads are wearing, heating and applying force isn’t going to be nice (or silent, in most cases).
I’ve definitely smelled brakes after a hard stop without a caliper being seized up.

As for brake fluid failures, you’ll have quickly fading or very soft brakes - you won’t even get to the point where you smell the pads, in most cases.

Calipers should be Volvo branded, or ATE.

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Re: P80 heavy braking smell question

Post by abscate » Sun Mar 10, 2019 9:57 am

Yeah those Cardone calipers are Volvo cores with pot metal Pistons in them. 2-3 years tops.

I've got two heading back under warranty on bench right now.


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Re: P80 heavy braking smell question

Post by WhatAmIDoing » Mon Mar 11, 2019 11:57 am

tardcart wrote:
Sat Mar 09, 2019 4:14 pm
I second the temp test, you can just put your hand on the center of each wheel. you will find one is hot. the caliper is so seized it only activates at full pressure and stays there for the ride home, giving the smell until the pads wear down. light breaking and its not moving.
there would be no smell from a panic stop but burned rubber. for some reason Volvos dont pull left or right with bad breaks like other cars do. Its not always the caliper. the break lines (rubber) can swell closed and not release pressure that forces by in panic stop. You can tell if you crack the bleeder and nothing drips out. dont worry about air going in. it won't if you dont move the peddle. I just bought two sets of Cardone rebuilt calipers no core and power coated for 25 bucket each shipped from Rock auto, but I see they now have only one side. Mine work great and dont rust. I dont know how to put the link in but you can go there easily. They say volvo on them. not rebuilt after market.
Have fun replacing those again in a year (ask me how I know :roll: ). Been through 3 sets of Cardone rebuilds, just getting ready to send one back.


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Re: P80 heavy braking smell question

Post by tardcart » Mon Mar 11, 2019 4:16 pm

sorry to hear that about the Cardone. Im not buying volvo on this one. any good pics on rebuilt (maby coated) rebuilt calipers?



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Re: P80 heavy braking smell question

Post by WhatAmIDoing » Mon Mar 11, 2019 5:08 pm

tardcart wrote:
Mon Mar 11, 2019 4:16 pm
sorry to hear that about the Cardone. Im not buying volvo on this one. any good pics on rebuilt (maby coated) rebuilt calipers?
Coating usually fails within a few weeks. My coated calipers are now "Rust Red". Better off buying uncoated and painting with your preferred rattle can before install. I'm going to try Centric rebuilds from FCP, but if those crap out within a year or two, I'm ponying up the money for new ATE/Volvo calipers. It's not worth my time to keep replacing calipers every year (although I am getting quite good at it).


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