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Brake noise & thud after brake fluid change - Help! '03 Accent

1791 Views 3 Replies 3 Participants Last post by  swordsman11868
Hello, I'm new to the forums so please bear with me. I'll try to be brief but still give as much info as possible.

Here's the problem: I'm getting a thud/clicking noise both when I press, and when I release, the brake pedal, but only when the car is in PARK.

I can actually _feel_ the thud in the gear shifter (automatic). It feels like its coming from something directly below the shifter.

Ok, here's the background:

After successfully changing the brake fluid in my BMW with ATE Super Blue I decided to also put it into my girlfriend's '03 ACCENT.

I used a Mightvac vacuum pump to suck out the old and fill in the new. I followed both the directions with the pump and the directions found on the Net for BMW's. I began with the passenger-rear wheel and had no difficulties.

I drove the car the same day but didn't notice any thud or click, but it began the next day.

The ATE fluid is much thinner than DOT 3 or 4. Could it be the proportioning valve, or, heaven forbid, the brake booster?

Any questions/suggestions are appreciated!

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The booster just works off vaccum to help apply force to the master cyl. No fluid goes in it so I dont think it would be messed up. Now the master cyl itself.. maybe. Why did you go with that fluid?
My 2000 Accent Uses Dot 3. Y did you use ATE?
Good news! After driving the car again the noise has stopped. Hopefully there won't be any long term effects.

To answer the question why I used ATE Super Blue, it has a higher dry and wet boiling point. So even if moisture gets into it it won't boil until something like 300 degrees.

It's higher than even DOT 4 and they claim it absorbs water more slowly and doesn't have to be changed as frequently.

I noticed it's a lot thinner than DOT 3 - not sure if that helps. But I do notice that the pedal feels a little "firmer".

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