What size rotor do I have?
11-06-2007, 06:07 PM
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What size rotor do I have?
Okay, I have a 98 2.8L Quattro and I'm needing to change out my brake rotors and pads. However I'm not sure which size to buy. Do I buy the 288mm, 312mm, or 321mm rotors. How does one tell?
I can tell you that I have 16" rims if that helps.
Thanks in advance.
I can tell you that I have 16" rims if that helps.
Thanks in advance.
11-07-2007, 08:21 AM
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Could be either
40v is at least partially right. I changed my rear pads and rotors (276mm) 2 weeks back for a 99' 2.8, but the supplier said that there were different rotors for 99 and 99.5. You may as well pull the rotor off and measure it or bring it with (15 minute job for removal).
Also, as the pads wear, the piston in the calipers adjusts w/ use of the e-brake. When you go to put the new pads and rotors in, you'll probably find that you can't fit it all in and you'll need to adjust the piston. Essentially you have to rotate the piston clockwise while applying heavy pressure. There's a special tool for this, but it can be done with a needle nose pliers and infinite patience.
Also, as the pads wear, the piston in the calipers adjusts w/ use of the e-brake. When you go to put the new pads and rotors in, you'll probably find that you can't fit it all in and you'll need to adjust the piston. Essentially you have to rotate the piston clockwise while applying heavy pressure. There's a special tool for this, but it can be done with a needle nose pliers and infinite patience.
11-08-2007, 06:05 AM
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Re:could be either
You are going to want the face of the piston just about flush with its housing (the bellows should be almost completely compressed). The combination of rotation and pressure is what actually moves the piston, one or the other won't do it.
There are 2 little dimples on the face of the piston that are used to rotate it, if you use a needle-nose pliers in the open position you can get each tine of the pliers in the dimples, if you have the C-clamp on there you may have a hard time accessing the dimples and rotating the piston around (it took me 3-4 full rotations, but my pads were almost bare and the rotors were badly rutted).
Once everything is back together, apply and release the e-brake several times until you think it's back to normal. The e-brake readjusts the piston after it's been moved.
After you've taken it out for a little test drive, double check the brake fluid level and make sure it's not over filled.
There are 2 little dimples on the face of the piston that are used to rotate it, if you use a needle-nose pliers in the open position you can get each tine of the pliers in the dimples, if you have the C-clamp on there you may have a hard time accessing the dimples and rotating the piston around (it took me 3-4 full rotations, but my pads were almost bare and the rotors were badly rutted).
Once everything is back together, apply and release the e-brake several times until you think it's back to normal. The e-brake readjusts the piston after it's been moved.
After you've taken it out for a little test drive, double check the brake fluid level and make sure it's not over filled.
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