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Old 07-25-2002, 04:56 PM   #1
Mops
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Member#: 16845
Join Date: Mar 2002
Location: Auckland, NZ
Vehicle:
1994 Legacy RS
Navy Blue

Unhappy Brakes problem - opinion needed

Hey ppl.
My problem is.... on the cold breakes, my Legacy RS breaks ok, but the the brakes are warmed up after couple of corners while using limit-braking, the following things happen...
1. The brake pedal is not that stiff anymore - it's fading and i have to push it significantly deeper then on cold brakes
2. Braking is uneven, whole cad is significantly shaking, steering wheel is pulling in random directions, and the whole things just feels unstable, unpleasant and even dangerous to drive.

When I let the brakes cool down a bit, the situation improves, until they get hot agian. I'm not really concerned about pedal fading away, as i know it can be fixed by putting racing-specs brake pads, but the shaking is extreamly annoying and i want o get rid of it.

See my other post for my other problem.

Thanks in advance, Matt.
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Old 07-25-2002, 05:13 PM   #2
Legacy777
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Matt,

You need to bleed your brake fluid, get some better pads, and get new rotors as yours are warped!

Stainless steel lines will help the pedal feel issue.
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Old 07-25-2002, 05:26 PM   #3
HIHO
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I agree totally with legacy777. I think your main problem is your fluid. You have alot of air and water in the line. Bleed with some good ATE fluid.
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Old 07-25-2002, 05:41 PM   #4
gavin
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Definitely contaminated fluid. However, if the shaking does not occur, when the brakes are cold, then your rotors aren't warped. You're probably just getting uneven braking due to the bad fluid.
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Old 07-25-2002, 06:27 PM   #5
ciper
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Id suggest switching pad brands too. I once purchased some cheap radio shack pads for my supra and they would fade more than all others I had previously. I replaced them and it was solved.

I had hoped to use the warranty to get the pads replaced often since I knew I would use them up in just a couple months. I guess I learned you get what you pay for.

Currently Ive put about 5k on my wrx brakes and already they probably lost 20% of the material
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Old 07-25-2002, 11:55 PM   #6
Mops
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Thanks for your opinions.

Can you please clarify
What do you mean by good ATE fluid ?
And What is the good brand for brake-pads.

As well I would like to mention that I dont want to spend a fortune on fixing that (I'm not that wealthy, I just like motorsport).

Thanks in advance !
Matt.
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Old 07-26-2002, 12:14 AM   #7
HIHO
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Quote:
ATE Super Blue Racing Brake Fluid - not all brake fluid is created equally. High operating temperatures at the caliper transfers extreme heat through the piston causing lesser quality brake fluid to bo8il. this in turn allows the fluid to become compressed and reduces overall braking performance. The best way to prevent this is to use a high performance mineral-based brake fluid and to flush the system after each event for competition or annually on performance street-driven vehicles. AP550 brake fluid is DOT-approved with a dry boiling point of 550 degrees F. It's low viscosity minimizes aeration and permits easy bleeding.
ATE is just a brand name.

Here is a link to an online vendor.-->http://www.spmotorsports.com/lubricants.html#ate

You might be able to find it cheaper somewhere else.

Good pads are going to set you back $80 and up. Try the fluid change first, if that doesn't help go for pads.
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Old 07-26-2002, 10:41 PM   #8
anotherB4
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yep - do the fluid first - many suggest DOT 5 spec, but IMHO, unless you are going to religiously change it every year, the risk of it absorbing moisture is too high (generally the higher the DOT figure, the higher the boiling point of the fluid is, but its propensity to absorb moisture also rises).

Stick with a good DOT 4 fluid - I have had good luck with AP Lockheed products. BP also has some good stuff - take a look at the specs on the bottles to compare them a bit. The Japanese brands are very good, but more expensive.

When you change the fluid, if you have not changed it ever, or for a long time, you may want to run a bit of the fresh fluid through the system to clean it out rather than just doing a simple fluid change.

If you still get the issue with the uneven brake response, the pads and discs should be your next stop. The std set-up has a pretty low capacity, so if you are hard on your brakes, an upgrade to mesh hoses, 4 pots from the later Rex (gotta watch out for wheel clearance if you do this), and good discs to go with them (in your part of the world the DBA products should be pretty accesible) is a good idea.

For just pads alone, you should have a decent range to choose from in NZ: Ferrodo, AP Lockheed, Project myu etc etc. Just remember that they make pads for all sorts of temp ranges, and that cheap are usually no better than stock.
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