Break problem. I need help/suggestions.
Thread Starter
Registered User
Joined: Dec 2002
Posts: 265
From: King of Prussia PA
Car Info: Blaze yellow WRX 2002
Break problem. I need help/suggestions.
Ok. I live in PA and it has been snowy here for the past week.
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.
Well then it snowed. Everyhting seemed fine. I had a lot of antilock break feeddback on the icy roads. But that is normal. Then the next day I noticed a problem. The roads were fine no ice or anything and I felt my breaks acting strange.
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.
The car stops but this concearns me and I have no idea what it could be.
Anybody have any ideas or suggestions????
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.
Well then it snowed. Everyhting seemed fine. I had a lot of antilock break feeddback on the icy roads. But that is normal. Then the next day I noticed a problem. The roads were fine no ice or anything and I felt my breaks acting strange.
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.
The car stops but this concearns me and I have no idea what it could be.
Anybody have any ideas or suggestions????
Registered User
Joined: Nov 2002
Posts: 313
From: nasioc.com
Car Info: 2000 RS Coupe/1990 Mazda Protege, zoom zoom..
I would take it to the dealer as soon as you can, let them feel it, its hard to say what it could be without actually driving it.
Could be air in the brake system.
Jay McDade
Lincoln/Mercury/Jaguar Tech
Could be air in the brake system.
Jay McDade
Lincoln/Mercury/Jaguar Tech
Thread Starter
Registered User
Joined: Dec 2002
Posts: 265
From: King of Prussia PA
Car Info: Blaze yellow WRX 2002
How the heck would have air gotten into my break lines.
Could be. Feels like it might be but how and why?
I have cross drilled slotted rotors. YOu think the dealer will try to tell me I voided my warrenty?
Could be. Feels like it might be but how and why?
I have cross drilled slotted rotors. YOu think the dealer will try to tell me I voided my warrenty?
Guest
Posts: n/a
Depending on what Impreza you have, I'm pretty sure that you have 4 chanel ABS (reads each tire seperately)
The one new tire may be causing the ABS to be over sensitive...
If you think the ABS is being problemmatic you can "pull" the ABS fuse & do some driving...
As far as air... hmmm
? how many miles are on the other 3 tires ?
If the new tire is too new you are SOL...
The max circumferance diffence between the bigest & smallest is around an 1/8" or 1/4" (I can't rember off the top of my head)
The rotors have little if nothing to do with the braking system lines & ABS controller...
If the system has changed "overnight" at the same time the tire was put on I would have to think that might be the cause.
The one new tire may be causing the ABS to be over sensitive...
If you think the ABS is being problemmatic you can "pull" the ABS fuse & do some driving...
As far as air... hmmm
? how many miles are on the other 3 tires ?
If the new tire is too new you are SOL...
The max circumferance diffence between the bigest & smallest is around an 1/8" or 1/4" (I can't rember off the top of my head)
The rotors have little if nothing to do with the braking system lines & ABS controller...
If the system has changed "overnight" at the same time the tire was put on I would have to think that might be the cause.
Thread Starter
Registered User
Joined: Dec 2002
Posts: 265
From: King of Prussia PA
Car Info: Blaze yellow WRX 2002
I guess.
I thought that too. But the other tires are not a whole lot different. I would be suprised if that was the case but it could be. It did happen after the change. But I feel nothing while driving.
What gets me is nto the ABS but the fact that my brake pedal is very stiff to start out and then when I get down to about 30-35MPH the pedal moves down (loses stiffness) and it moves an inch or more then stiffens up again and I get brakign again.
To me that os more than a tire.
I thought that too. But the other tires are not a whole lot different. I would be suprised if that was the case but it could be. It did happen after the change. But I feel nothing while driving.
What gets me is nto the ABS but the fact that my brake pedal is very stiff to start out and then when I get down to about 30-35MPH the pedal moves down (loses stiffness) and it moves an inch or more then stiffens up again and I get brakign again.
To me that os more than a tire.
Thread Starter
Registered User
Joined: Dec 2002
Posts: 265
From: King of Prussia PA
Car Info: Blaze yellow WRX 2002
So what is the different. I will look at my manual tonight.
If I have one new tire that is bigger than the rest what are my options???
Does that mean I have to get 4 totally new tires? Or can I get the new tire shaved or worn in to the same level as the existing tires?
I don't want this to end up costing me an arm and a leg???
What are my options here?
DO you really think that a tire size different would cause such a noticeable change in the brake feel and pressure and loss of pressure? I could see it affection the ABS but the brake feel itself????
If the sizes were off wouldn't I feel a difference in performance and ride when doing 50MPH and not applying the brakes?
If I have one new tire that is bigger than the rest what are my options???
Does that mean I have to get 4 totally new tires? Or can I get the new tire shaved or worn in to the same level as the existing tires?
I don't want this to end up costing me an arm and a leg???
What are my options here?
DO you really think that a tire size different would cause such a noticeable change in the brake feel and pressure and loss of pressure? I could see it affection the ABS but the brake feel itself????
If the sizes were off wouldn't I feel a difference in performance and ride when doing 50MPH and not applying the brakes?
Registered User
iTrader: (2)
Joined: Nov 2002
Posts: 1,644
From: Lawrence, Kansas
Car Info: 19' Impreza Sport Manual / 99 Miata / 13' OB
ABS info:
http://www.endwrench.com/pdf/brakes/FtSubaruABSS99.pdf
and the size diff should be <1/4"
Look here:
http://www.endwrench.com/pdf/drivetr...ceInfoS000.pdf
Peaty
PS have you checked your tire pressures? I've found the dealer likes to put more air than is proper in the tire. Maybe the new one is higher. A stretch but easy to check.
http://www.endwrench.com/pdf/brakes/FtSubaruABSS99.pdf
and the size diff should be <1/4"
Look here:
http://www.endwrench.com/pdf/drivetr...ceInfoS000.pdf
Peaty
PS have you checked your tire pressures? I've found the dealer likes to put more air than is proper in the tire. Maybe the new one is higher. A stretch but easy to check.
Guest
Posts: n/a
Good call on the preasures...
Depending on the tire & ballance of the car it can make a diffrence.
Personally I like to run 4 psi less in the rear...
Usually 38front/34rear...
If the new tire is pretty close you could try 1-1.5psi less in the new tire & do some testing... I wouldn't go too crazy on changing left & right mixxing (you don't run on a super speedway do you?)
If the old tires are too far gone & dont match up well you may need to change the other 3...
Depending on the tire & ballance of the car it can make a diffrence.
Personally I like to run 4 psi less in the rear...
Usually 38front/34rear...
If the new tire is pretty close you could try 1-1.5psi less in the new tire & do some testing... I wouldn't go too crazy on changing left & right mixxing (you don't run on a super speedway do you?)
If the old tires are too far gone & dont match up well you may need to change the other 3...
Thread Starter
Registered User
Joined: Dec 2002
Posts: 265
From: King of Prussia PA
Car Info: Blaze yellow WRX 2002
The difference in tread is about an 1/8 of an inch. I used a quarter to measure it. One tread (old tire) came from the bottom of the quarter up to the begining of the words "In God We Trust". The new tire came to the top of the words.
So that is not 1/8 of an inch it is less so the overall diameter is less than 1/4 inch.
So that is not 1/8 of an inch it is less so the overall diameter is less than 1/4 inch.
Registered User
iTrader: (2)
Joined: Nov 2002
Posts: 955
From: Mann Engineering, Santa Clara, CA
Car Info: 13BRZ, 11FXT, 08T25, 07STI, 02WRX
Those pressures are recommended by the factory. You do not have to follow them but are a good basis to start with. Do you mind keeping all of your brake problems in one post?
Guest
Posts: n/a
Originally posted by jasno999
I thought the proper pressures for the front tires was 32 and the reard was like 29 or something.
I thought the proper pressures for the front tires was 32 and the reard was like 29 or something.
Increasing the tire pressure will help this...
If you read the tires side wall they are rated up to 44-45 psi if I rember...
There is a point of diminishing returns... too much pressure & the tires won't stick as well.
Also "harder" tires have less rolling restance for slightly better mileage.
Thread Starter
Registered User
Joined: Dec 2002
Posts: 265
From: King of Prussia PA
Car Info: Blaze yellow WRX 2002
Dealer told me warranty is void cause I have x-drilled/slotted rotors.
Dealer told me warranty is void cause I have x-drilled/slotted rotors.
I took my car in for service today cause I am havign brake problems. Before he even got in the car he told me I voided my warranty cause I changed one part on the brake system so the entires system was voided when it came to the warranty.
Is this true. Cany they do that. What if my master cylinder is broken. Can they actualyl say it was caused my different rotors on the car and not pay for it under warranty?
I need some infor from you guys. Anybody else had similar problems?
I took my car in for service today cause I am havign brake problems. Before he even got in the car he told me I voided my warranty cause I changed one part on the brake system so the entires system was voided when it came to the warranty.
Is this true. Cany they do that. What if my master cylinder is broken. Can they actualyl say it was caused my different rotors on the car and not pay for it under warranty?
I need some infor from you guys. Anybody else had similar problems?
Registered User
Joined: Nov 2002
Posts: 221
From: South Carolina
Car Info: 02 WRX
I think that you really need to measure your tire circumfrence
pie*r^2 hint
3.14*16^2=803.8"
3.14*16.1^2=813.9"
If the new tire is a diff brand or even model you may need to get a diff tire
please don't start a thread and then another so simmilar.
If the tire thing does not pan out find another dealer
pie*r^2 hint
3.14*16^2=803.8"
3.14*16.1^2=813.9"
If the new tire is a diff brand or even model you may need to get a diff tire
please don't start a thread and then another so simmilar.
If the tire thing does not pan out find another dealer