johnsimister
Active Member
I fitted new front discs and pads to my 2000 TC about 1000 miles ago. When the brakes are still cold the response is smooth and firm. Once the brakes have been used a few times and are warm, the front brakes seem to brake more firmly once every wheel revolution, leading to an annoying surging as the car comes to a stop. The pedal doesn't pulsate, as it might do with warped discs. I can't see anything wrong with the discs, and there appears to be no run-out. There is a very slight steering vibration at speed which wheel-rebalancing hasn't entirely eradicated. I replaced the old discs because they had patches of corrosion where they had been immobile against the pads for many years, leading to noise and snatch when coming to halt.
It's almost as if the new discs have a varying density of metal, so parts of them expand more than other parts when hot. That could also explain the slight steering vibration. Is it possible that the discs are badly cast and contain unseen air bubbles? Seems a weird idea but I'm at a loss.
I'll measure the thickness of the old discs and see if it might be possible to skim them, but that doesn't solve the problem of what is wrong with the new ones. Has anybody else experienced anything similar with the new discs currently available?
It's almost as if the new discs have a varying density of metal, so parts of them expand more than other parts when hot. That could also explain the slight steering vibration. Is it possible that the discs are badly cast and contain unseen air bubbles? Seems a weird idea but I'm at a loss.
I'll measure the thickness of the old discs and see if it might be possible to skim them, but that doesn't solve the problem of what is wrong with the new ones. Has anybody else experienced anything similar with the new discs currently available?