Break problem. I need help/suggestions.

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Dec 16, 2002 | 05:36 PM

#16

Peaty

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Joined: Nov 2002

Posts: 1,644

From: Lawrence, Kansas

Car Info: 19' Impreza Sport Manual / 99 Miata / 13' OB

>So that is not 1/8 of an inch it is less so the overall diameter is less than 1/4 inch.

The proper way to measure is a tape measure around the outside of the tire or the circumference Wouldnt that 1/8 inch translate into more than 1/4"? Circumferemce = Diameter X pi so if you add 1/8 radius increase + 1/8 for the diameter then you get C=D+.25pi or 0.785" more circumference.

Dec 16, 2002 | 08:26 PM

#17

GLwagon

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Re: Dealer told me warranty is void cause I have x-drilled/slotted rotors.

Quote:

Originally posted by jasno999
Dealer told me warranty is void cause I have x-drilled/slotted rotors.
I need some infor from you guys. Anybody else had similar problems?

The way the laws are written the part that has been upgraded isn't warrantied (not same Mfg.), but the rest of the system is still covered UNLESS the upgraded part IS causing the problem...

Ex:
If your pads are chewed by cheap slotting ( hey too bad )

If your ABS light comes on because of an electronic falure (they have to fix it unless they can definately prove your mod caused the problem)

Rotors are a simple part... there is slight (not likely) chance that the biasing is AFU & the fronts are too grippy...
The main thing is that if the rotors aren't over sized then nothing has realy changed except the heat disapation is better...

Dec 17, 2002 | 01:26 PM

#18

jasno999

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Joined: Dec 2002

Posts: 265

From: King of Prussia PA

Car Info: Blaze yellow WRX 2002

I put a coin in my tread. A quarter to be exact. The old tires cam up to the bottom of the words "IN GOD WE TRUST" On the new tire it came to the top of the words "IN GOD WE TRUST"

Now I know that is not the best way to do it but it is all I had at the time. To me that is about a 1/16 inch difference. So multiply that by two and you get 1/8 inch for the total tire. That should be within spec.

What is the proper way to measure the tire sizes?

Dec 17, 2002 | 03:12 PM

#19

bamfwrx

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Joined: Nov 2002

Posts: 221

From: South Carolina

Car Info: 02 WRX

Quote:

Originally posted by Peaty
Circumferemce = Diameter X pi so if you add 1/8 radius increase + 1/8 for the diameter then you get C=D+.25pi or 0.785" more circumference.

I think that we're both wrong
radius*pie=cercumference

edit answered wrong the fisrt time

Last edited by bamfwrx; Dec 17, 2002 at 05:29 PM.

Dec 17, 2002 | 07:12 PM

#20

jasno999

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Registered User

Joined: Dec 2002

Posts: 265

From: King of Prussia PA

Car Info: Blaze yellow WRX 2002

So what is the proper way to measure this and how do I know what is too much.

I am so confused.

Dec 17, 2002 | 08:33 PM

#21

bamfwrx

Registered User

Joined: Nov 2002

Posts: 221

From: South Carolina

Car Info: 02 WRX

sorry abput the confusion I had posted the worng formula (area)
then I read the post correcting my mistake
then read a liner speed formula but forgot that it was in radians
PEATY is right and I am wrong twice in one thread kinda scary

Dec 18, 2002 | 05:48 AM

#22

jasno999

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Registered User

Joined: Dec 2002

Posts: 265

From: King of Prussia PA

Car Info: Blaze yellow WRX 2002

ok pretend I am an idiot and re-explain everythign to me

Dec 18, 2002 | 07:02 AM

#23

Peaty

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Posts: 1,644

From: Lawrence, Kansas

Car Info: 19' Impreza Sport Manual / 99 Miata / 13' OB

Look at the two links I posted above that are in PDF format. That is the Subaru way to measure. You need to measure around the tire's outside with a tape measure.

Peaty

PS: I can't take the credit for the correct answer. My wife helped me with the math, she's the Engineer in the family. And for some bizarre reason she thought it was fun math. Go figure. Then I hit her up with figuring out the reduction of the arc of throw with a short shifter and the difference above and below the pivot (fulcrum) point. She really liked that one. Maybe if I whisper the Pothagarem (SP?) theorem in her ear at night I might get more action

Dec 19, 2002 | 04:49 AM

#24

jasno999

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Joined: Dec 2002

Posts: 265

From: King of Prussia PA

Car Info: Blaze yellow WRX 2002

Re-explain it to me again.

Mar 12, 2003 | 10:59 AM

#25

breed

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Posts: n/a

Re: Break problem. I need help/suggestions.

Quote:

Originally posted by jasno999
Right before the snow I had a flat tire so I got a new tire put on my factory rims. Same as the factory supplied tires. Potenza 92R.

. . . . . . .

When I am doign like 30-40MPH or more I apply my brakes and they feel very stiff. They are stiffer than normal. Then as I slow down to about 20 they let or or get soft and travle down some. Then I get a little ABS feeback in the pedal and it hits another poitn where it gets stiff again.

Hope you get this message in time... I had this same problem with my 02 WRX. My dealer reported to me that there IS a technical service bulletin on this problem with SOA. Sometimes when the spare tire is put on and the car is driven for a while, the ABS controller fails (or blows up or burns out..whatever). This is because the spare 'donut' has a different diameter from the rest of the wheels--it throws off the ABS system. I had my ABS controller replaced under the standard warranty (36k/3 years).

I was exhibiting the exact SAME symptoms you are, jasno999. Maybe try taking the car to another dealer that knows that crossdrilling the brakes won't blow out an ABS controller.

I even had to go to two different dealers before they would recognize the problem. I'll try to look on my service receipt and see if the TSB# is on there.. PM me if you need it.

- breed