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Old 07-19-2002, 07:47 PM   #1
Scooby Newbie
Member#: 21216
Join Date: Jul 2002
Location: Los Angeles
1998 Impreza RS

Question Minimum Rotor Thickness and Brake Fluid capacity? - MY98 RS


I'm replacing my pads, turning the rotors, and flushing the fluid this weekend, but I don't have a service manual (it's on its way).

Can anyone tell me what the minimum rotor thickness is for a MY98 Impreza RS? I called a few dealerships, and they say 22 mm, but there's no way my rear rotors are 22 mm--they're not vented.

Also, how much brake fluid is required for a complete flush? I've got a liter of Super Blue, but now I'm wondering if I should have bought 2.

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Old 07-19-2002, 08:17 PM   #2
Scooby Specialist
Member#: 5596
Join Date: Apr 2001
Chapter/Region: TXIC
Location: Houston, TX
2010 Honda Fit Sport


The stock WRX rear discs say 8.5mm. Not sure if it's the same for the RS. My guess is that it is.

I replaced my fluids with Super Blue too, and took me just under a liter. If you're careful, and don't need to bleed brakes excessively afterwards, you should be fine with one.

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Old 07-19-2002, 11:39 PM   #3
Fred Zaplitny
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Member#: 92
Join Date: Jul 1999
Location: East Detroit, Michigan
1999 2.5RS Coupe
Blueish Kind of


I believe the rotors will have the minimum tolerance stamped right on them. Look inside the hub. I know my fronts were like that. The fronts were 22mm. Not the rears. The rears aren't even 22mm to start with!

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