Brake rumble at high speeds?

[Bones]

What would cause a rumble when hitting the the brakes, not hard just to start taking the edge of the speed, were talking high speeds here 120-130mph+

Reason im asking, my mate....Dave.... says he felt rumbling, like the kind you get if a car has been sitting a while and the discs have got a bit rusty. Its fine for normal driving and motorway speeds etc

Funnily enough he also drives a 2001 S60 T5. Any pointers at where to start looking? im edging towards lower wishbone bushes??

[M-R-P]

Could be bushed, could be crap/worn disks and pads that don't like being subjected to those speeds.

[stribo]

Maybe it's caused by him going too fast.;)

[Bones]

Maybe it's caused by him going too fast.;)

I said that to him! Think he got an ear bending from his Mrs too!

So, probs definateley looking at bushes, and might aswell use it as an excuse to uprate the discs and pads aswell. Although they were newly fitted at the beggining of this year, not long before David bought the car..........possibly ebay jobbies then

[JamesT5]

Any wheel shake?

[Bones]

No, no wheel wobble at all. Its pretty stable all the way untill the clocks run out of numbers!

slight noise off the top mounts on rough roads but thats really about it. No out of balance sort of feeling at all though

[LeeT5]

What would cause a rumble when hitting the the brakes, not hard just to start taking the edge of the speed, were talking high speeds here 120-130mph+

Reason im asking, my mate....Dave.... says he felt rumbling, like the kind you get if a car has been sitting a while and the discs have got a bit rusty. Its fine for normal driving and motorway speeds etc

Funnily enough he also drives a 2001 S60 T5. Any pointers at where to start looking? im edging towards lower wishbone bushes??

Start by removing front wheels and measuring the thickness of the discs. If they are still within manufacturer spec then I'd bin the old brake pads and fit some stock pads in. 50 miles of gentle driving to bed in and see what happens.
It won't be worn bushes becasue that will just cause the steering to wander and not cause a 'rumble' as you put it, in the brakes.

Chances are its the pads wearing thin or incompatible with the discs. Start simple!!

[Bones]

New discs and pads were fitted in march time, Although strongly suspect that they are either ebay specials or whatever brand the local motor factors sold. Hopefuly going to manage to book a day of work next week, so ill dedicate a day to poking and prodding the motor

I think its just a perfect excuse to uprate the discs, pads and fit braided line's. Do it at the same time as the polybushes, springs shocks etc get fitted. Luckily enough I've got access to ramps so that at least saves faffing about lifting a corner at a time!

Sounds like Dave's wallet is going to get a battering. And ill remind him to stick to the speed limits for the forseable future.

[LeeT5]

I'd be careful mixing discs and pads. It's a common problem where certain pads don't bode well with a different manufactured disc. try to stay the same for disc and pad.

Textar disc textar pad or OE disc OE pad.

[Bones]

I see what your saying, to be honest, ive never though about doing that! Might explain why the brakes on my scooby were so pants.....

Any suggestions on what these things like as an up rated part? Brembo, black diamond? Grooved? Drilled?

[LeeT5]

Brembo are standard. Stick with oe.

[Harvey]

Best get the runout of the disc's tested.
Here's a good link to have a read up on.

http://www.bremboaftermarket.com/en/Car_Disc_Indications/Maintenance_Disc.aspx