richardharmon Posted February 14, 2005 Share Posted February 14, 2005 I have been experiencing mild brake pedal vibration under heavy braking so I measured the brake disc run-out. The drivers side seems way off the scale at about 0.20mm (instead of the 0.05mm spec). This would explain the vibration. I couldn’t reduce the run-out by moving the disc round in each of its 5 positions so I measured the hub run-out and that’s right on the limit (0.05mm). I suspect that if the discs are true then the run-out at 10 mm from the outer edge of the disc is always going to be more than at the hub (seems to make sense to me anyway)? The vibration does get worse when the brakes are hot but that would point to the discs, not the hub, wouldn't it? Could a dodgy bearing cause the run-out at the hub or is it more likely that the hub is buckled? How easy is it to change the front wheel bearing, anyone done it themselves or do you need some sort of press to seat the bearings? Any suggestions or experiences in this matter would be appreciated. Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 14, 2005 Share Posted February 14, 2005 It won't be the bearing, it will be the hud wheel flange itself. If you remove the hub, press out the studs and get a good machinist to true the wheel flange up in a lathe it should be re useable, but to be honest, given the hassle factor, it may be better to just buy a new hub. None stock wheels and overtightened hub nuts are common causes of warped flanges. You are right, run out and Y mm from the hub centreline will be a lot greater at 3x Y mm from the flange centreline. Link to comment Share on other sites More sharing options...
TLicense Posted February 14, 2005 Share Posted February 14, 2005 Measured on a 110mm dia. (IIRC) the hub runout should be no greater than 0.04mm. I found both mine to be within this after a little attention with some emery to remove rust high spots and the like. For what it's worth at about 350mm dia. I got a hub runout of 0.03mm. The specified max from AP is 0.07mm. They recommend indexing the disc on the hub if you're getting v.close but not quite. Regards, Tony License Link to comment Share on other sites More sharing options...
richardharmon Posted February 15, 2005 Author Share Posted February 15, 2005 Thanks guys. How easy is it to remove the hub? I assume there's a big nut on the back of the knuckle assembly, under the metal dust cover at the back? Can the studs be easily pressed out of the hub with a vice and a socket? Link to comment Share on other sites More sharing options...
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