Dimpled vs Drilled rotors...
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#3
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I agree, I doubt you will notice any difference, some people complain about noise from drilled/dimpled discs.
There was a theory at one time that depending on disc thickness and hole diameter you could increase the surface are by drilling and improve cooling, but vented discs have made that an obsolete notion.
There was a theory at one time that depending on disc thickness and hole diameter you could increase the surface are by drilling and improve cooling, but vented discs have made that an obsolete notion.
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#6
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I well remember ineffective disk brakes on bikes. My first new m/c was a '73 Norton Commando Roadster. Terrifying in the wet unless stops were well anticipated and compensated for.
Last edited by Mikey; 06-29-2013 at 12:20 PM.
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#8
I believe that the confusion is in that you are referring to "surface area with the air", while others were thinking in terms of "surface area in contact with the pads".
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#10
For what it's worth I fitted grooved and dimpled discs to front and rear. The brake performance and longevity seems much better than with the old standard discs, I suffer with far less brake fade and it feels to haul up a little sharper.
There is some noise with them, but it's a nice fluttering sound which I quite like, there's a re assuring hum when braking hard from high speed.
I wouldn't go back to standard discs.
There is some noise with them, but it's a nice fluttering sound which I quite like, there's a re assuring hum when braking hard from high speed.
I wouldn't go back to standard discs.
Last edited by Blue XK; 06-29-2013 at 04:36 PM.
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#12
#14
The car was serviced by the same original Jaguar Dealer from new and pads were changed by them before I collected the car.
Jaguar Dealers here can't use anything but Jaguar parts so they are MXD1550AB (Brembo in a Jaguar box).
Dust on the wheels isn't particularly heavy (although Sepangs aren't the easiest to keep clean) and I only found out the holes were blocked when I tried putting a small drill bit through them. The discs themselves stay bright.
Graham
Jaguar Dealers here can't use anything but Jaguar parts so they are MXD1550AB (Brembo in a Jaguar box).
Dust on the wheels isn't particularly heavy (although Sepangs aren't the easiest to keep clean) and I only found out the holes were blocked when I tried putting a small drill bit through them. The discs themselves stay bright.
Graham
#15
Graham
After reading your last post I went out and with my pen light and checked holes in the rotors, their clean. I have the same pads that you do MXD 1550AB. Possibly the difference is I don't get stuck in the rain much, while you guys over the pond don't get out of the rain to often. I do power wash my wheels and brakes a couple of times a year. It's a lot easier to get to the rotors and calipers with the Detroit wheels. The brake dust is one of the biggest reasons I wash my car. After a couple of hours of driving the hills put your hand on the quarter and it will be black with a fine dust.
After reading your last post I went out and with my pen light and checked holes in the rotors, their clean. I have the same pads that you do MXD 1550AB. Possibly the difference is I don't get stuck in the rain much, while you guys over the pond don't get out of the rain to often. I do power wash my wheels and brakes a couple of times a year. It's a lot easier to get to the rotors and calipers with the Detroit wheels. The brake dust is one of the biggest reasons I wash my car. After a couple of hours of driving the hills put your hand on the quarter and it will be black with a fine dust.
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#17
#19
Holes and slots
Just an observance, the purpose of the holes is better cooling and off-gassing of tortured brake pads. Slots are to cut away the surface of the pads to expose new pad surface. Neither help normal braking and actually slightly decrease contact area, ergo somewhat reduced braking. If you use your brakes hard, like slowing from 150 to take the apex at 50 over and over, yeah, they have a place.
#20
As asked by Jazzcat
Which is preferred for spirited street applications ?
Which is preferred for spirited street applications ?
http://www.tazcobra.com/SAE_2006010691_Synopsis.pdf
These test were conducted by the Society of Automotive Engineers, It is one of the reason why many performance cars come with cross drilled.