XC70 rear brakes

[apersson850]

I don't know either. Ventilated discs don't make much of a difference at low speed rough terrain driving.
AWD cars are a little heavier. Maybe that's it? Or maybe it's that they want larger mass and (although marginally at low speed) better cooling, since traction control will heat up the rear discs too on AWD cars.

[Kev0607]

Originally Posted by apersson850

I don't know either. Ventilated discs don't make much of a difference at low speed rough terrain driving.
AWD cars are a little heavier. Maybe that's it? Or maybe it's that they want larger mass and (although marginally at low speed) better cooling, since traction control will heat up the rear discs too on AWD cars.

Maybe.

I think vented discs dissipate heat better, so that probably has something to do with it.

[Peter2400]

I have an awd s80 and the rears are solid type. My2008.

[passenger]

Originally Posted by Peter2400

I have an awd s80 and the rears are solid type. My2008.

Maybe not original?

Thanks for answers guys

[ferg55]

Originally Posted by Kev0607

Maybe.

I think vented discs dissipate heat better, so that probably has something to do with it.

It may be to cope with the extra weight of the propshaft, rear diff and rear driveshafts. I *think* the rear springs were different for the AWD's too, for the same reason - but that's just a hunch.

[Peter2400]

Originally Posted by passenger

Maybe not original?

Thanks for answers guys

Well, i think (hope) that someone who changed it (bought the car used) could differentiate a vented and solid disc, and not fit other type in. Don't think it would work properly too, as calipers and brackets are different for each type.

[passenger]

People always do something. Fox example, my car was 13y and 130 000km by one owner. His cousin is big Volvo garage manager. And every service was made it in volvo from very first day. Timing belt, aux belt everything. New brakes also: Textar. So, he did in volvo, I have bill, but not original. Of course after few hard braking, disc managed to bend a lil bit. Now it's vibrating on long downhill braking.

I just hope.so he put original parts for aux and timing belt

[Ian21401]

Originally Posted by passenger

People always do something. Fox example, my car was 13y and 130 000km by one owner. His cousin is big Volvo garage manager. And every service was made it in volvo from very first day. Timing belt, aux belt everything. New brakes also: Textar. So, he did in volvo, I have bill, but not original. Of course after few hard braking, disc managed to bend a lil bit. Now it's vibrating on long downhill braking.

I just hope.so he put original parts for aux and timing belt

I recently replaced the front discs on my daughter’s XC70 because of vibration. I fitted genuine OE.
With a bit of fiddling you may be able to see the part numbers on those belts if you really want to. Alternatively, if in doubt, replace them with OE.

[Kev0607]

I fitted Pagid front brakes to my car & they were warped in no time. This wasn’t with excessive heavy braking either, as I rarely brake with a heavy foot. I put it down to poor quality. I replaced them with genuine Volvo ones & they’re great.

I thought I was saving money by fitting cheaper Pagid’s, but it cost me more because I had to bin them & buy Volvo ones. Pagid is used as OE on so many vehicles & it was an eye opener that they were junk. My Dad had the same issue with Pagid discs on his van - They were lipped around the edges in a few months. He ditched them too & ended up fitting Brembo.

[Tatsfield]

Lipping can be caused by not having the pad hardness matched to the discs. Warping by the discs over heating due to pad/disc mismatch. On a previous car I found that a lot of after market pads were too hard for the Brembo discs I had on the car and wore them quicker than anticipated. It seems that the manufacturer had opted for soft iron discs with soft pads to give more grip at street level driving. A lot of fancy pads and discs with eye candy appeal and "racing" pretensions are just too hard to give grip at slower speeds and when mismatched either prematurely wear out the discs or the pads.