complete, what next?
Join Date: Oct 2012
Location: United Kingdom
I'm pretty sure the calliper is not binding. I checked, cleaned and re-lacquered it while it was off when fitting the discs and it was all good; there is no heat from the hub, no smell, no blueing of the disc, and no uneven wear on the pads; I'm pretty anal about the fuel consumption too (as it is a good indication of any problems), I check it every fill, it consistently does 27-28mpg and no deterioration.
As for drilled & grooved discs warping. The groves are there to clear brake dust debris, gases and water from the friction surface; the central venting and cross drilling is to AID brake cooling, reducing brake fade and helping to prevent warping! A properly designed & manufactured disc that is vented, drilled & grooved should give a much better reliability and more consistent brake feel than a standard disc, especially under high use conditions. The trade off is increased pad wear, something I am more than happy to live with (LIVE being a good word to use). Before fitting the discs and pads my brakes felt very "woolly", no matter how hard I pressed on the brake pedal there seemed to be a point where the increase in input pressure had no effect on braking effort; leading to a few prayers being said as the car slowed at it's own rate! (who remembers the Scenic Railway at Dreamland Margate? The brakes were operated by a guy with a long lever and a block of wood on the end. If you had and enthusiastic driver he would have the blocks virtually on fire at the end of the ride!)
I can definitely say that when fitted the drilled & grooved discs transformed the braking; less effort was needed to haul the mass to rest, and with a consistent hard input the braking effort seems to INCREASE as the brakes bite; and I've never had that feeling that she was not going to stop in time! Even with the vibration the braking effort was brilliant.
"When I see an Alfa Romeo I lift my hat" - Henry Ford