Occasional noise after switching to WRX front brakes on 95 L impreza

Impretzle · 01-07-2005, 10:07 PM

Occasionally, when doing a full throttle U turn in first gear, or driving around, my brakes will make a sound, as if they've reached the warning indicator on the pads. It goes away pretty quickly. What I'm guessing is, when putting on the WRX rotors and calipers, I didn't switch to WRX dust shields. This is allowing rocks or whatever to occasionally get stuck between my rotor and dust shield, causing a horrible screeching noise. I'm not that worried about it now that I know what's causing it. Just wanted to give a heads up to anyone else who may have been wondering what the noise was.

Oh one more thing, it seems to take 2 pushes of the brake pedal to get full pressure on those 2 piston fronts. Anyone else experience this? They work fine on one push but the pedal feels better if I press it twice. The car has 114k on it. Could it be due for a master cylinder? Also, is there an upgrade I should get, like a WRX MC or other subaru MC?

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Homemade WRX · 01-08-2005, 06:41 PM

Quote:

Originally Posted by Impretzle

Oh one more thing, it seems to take 2 pushes of the brake pedal to get full pressure on those 2 piston fronts. Anyone else experience this? They work fine on one push but the pedal feels better if I press it twice.

I have the same thing, but am looking for a new master cylinder...and bigger and bettter one. I still have the power to lock up the brakes on one pump but the pedal travels much less and is much firmer if pumped twice

Impretzle · 01-08-2005, 07:25 PM

Exactly. At first I thought it needed to be bled again, but I'm thinking the stock MC just doesn't have enough pressure for those 2 pots. I wonder how much bigger the WRX MC is, compared to the L one.

cooparu · 01-08-2005, 09:58 PM

I put wrx brakes (and dust shields

) on my 97 OBS, and I don't have this issue. I will be putting a larger MC in there later when I get the rear wrx brakes on. Currently I have a 1" MC, and will go up to 1 1/16". Not sure, maybe your 95L has a 15/16" MC?

My brakes are stronger as they are now than stock, with a hardly detectable increase in pedal travel, which will probably get worse when I get the rear brakes on (which is why I plan the change to a larger MC.)

Your 2 push issue is interesting.

The wrx MC is 1 1/16", but may be non-compatible with your current MC setup. I have to go with a Legacy MC, personally, so it's something to check out.

OneOBS · 01-08-2005, 10:49 PM

Quote:

Originally Posted by Impretzle

Exactly. At first I thought it needed to be bled again, but I'm thinking the stock MC just doesn't have enough pressure for those 2 pots. I wonder how much bigger the WRX MC is, compared to the L one.

I don't think your MC is the issue. My stock OBS MC drives my 4-pots just fine. I think you have air in the system and need a good bleed.

01-07-2005, 10:07 PM	#1
Impretzle Scooby Newbie Member#: 74900 Join Date: Nov 2004 Location: Oakland, CA Vehicle: 2008 STI black	Occasional noise after switching to WRX front brakes on 95 L impreza Occasionally, when doing a full throttle U turn in first gear, or driving around, my brakes will make a sound, as if they've reached the warning indicator on the pads. It goes away pretty quickly. What I'm guessing is, when putting on the WRX rotors and calipers, I didn't switch to WRX dust shields. This is allowing rocks or whatever to occasionally get stuck between my rotor and dust shield, causing a horrible screeching noise. I'm not that worried about it now that I know what's causing it. Just wanted to give a heads up to anyone else who may have been wondering what the noise was. Oh one more thing, it seems to take 2 pushes of the brake pedal to get full pressure on those 2 piston fronts. Anyone else experience this? They work fine on one push but the pedal feels better if I press it twice. The car has 114k on it. Could it be due for a master cylinder? Also, is there an upgrade I should get, like a WRX MC or other subaru MC? * Registered users of the site do not see these ads.

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01-08-2005, 07:25 PM	#3
Impretzle Scooby Newbie Member#: 74900 Join Date: Nov 2004 Location: Oakland, CA Vehicle: 2008 STI black	Exactly. At first I thought it needed to be bled again, but I'm thinking the stock MC just doesn't have enough pressure for those 2 pots. I wonder how much bigger the WRX MC is, compared to the L one.

01-08-2005, 09:58 PM	#4
cooparu Scooby Specialist Member#: 67767 Join Date: Aug 2004 Chapter/Region: NWIC Location: Boise, ID Vehicle: 2010 WRX Red	I put wrx brakes (and dust shields ) on my 97 OBS, and I don't have this issue. I will be putting a larger MC in there later when I get the rear wrx brakes on. Currently I have a 1" MC, and will go up to 1 1/16". Not sure, maybe your 95L has a 15/16" MC? My brakes are stronger as they are now than stock, with a hardly detectable increase in pedal travel, which will probably get worse when I get the rear brakes on (which is why I plan the change to a larger MC.) Your 2 push issue is interesting. The wrx MC is 1 1/16", but may be non-compatible with your current MC setup. I have to go with a Legacy MC, personally, so it's something to check out.