resolved 2001 Brake or ABS pulse noise (not warped roots) - Mitsubishi-Forums.com
 
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post #1 of 8 (permalink) Old 06-07-2016, 03:46 PM Thread Starter
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resolved 2001 Brake or ABS pulse noise (not warped roots)

Ever heard antilock brake system make a 4-pulse noise like "urk urk urk urk" that you can feel a little in pedal? I'd like to attach a short & small 4MB video I made but don't know where to put it, lol. It only does it at first press of pedal, about 1/2 second after it's depressed...and every time.

I don't have a brake light on now but sometimes the antilock dummy light will come on and off, or stay for a while.

I don't care if the antilocks don't work because I like all manual old school operation anyway. I know how to drive, lol. But I do want the brakes to always work of course!

It brakes good, straight, quiet and evenly. Fluid is full and doesn't leak out. Seems clean.

Any guesses? Maybe ABS Booster that runs on vacuum...thus the short delay?

There is a small wire on top of the intake plenum that isn't plugged in, but there isn't a male plug anywhere for it to mate with. Took pic of it, and I did get that to attach!
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Last edited by chain rattle; 06-09-2016 at 07:26 PM.
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post #2 of 8 (permalink) Old 06-07-2016, 05:38 PM
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unplug the relays for the abs and see if the symptoms go away

Derek
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post #3 of 8 (permalink) Old 06-07-2016, 05:43 PM Thread Starter
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Thanks. I tried that. It made the ABS light ignite solidly but didn't stop the noise. I was hopeful. Forgot to mention that.
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post #4 of 8 (permalink) Old 06-08-2016, 07:51 AM
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The ABS pulse should only occur when it is actually doing something - i.e. lock - unlock - lock - unlock etc.


If this pulse is same as when you make an emergency brake - I would check calipers - slightly stuck Piston ???
Next would be the sensors - maybe one is giving a wrong Signal.


Would definetly help if you had the code(s).
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post #5 of 8 (permalink) Old 06-08-2016, 01:01 PM
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unplugging the relays will for sure make the light come on immediately.... i just wonder if the problem is some where else because unplugging the relays should have made the symptoms go away i would think if it was abs related.... hmmmm ill look around the web and see if i can get you a better answer asap

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post #6 of 8 (permalink) Old 06-08-2016, 01:41 PM Thread Starter
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Thanks.I'm not sure if this is possible but another post mentioned maybe a bad or malfunctioning Brake Booster Accumulator. I'm not sure if this is the same as the resevoir or not, lol. Hadn't had time to see.

I'm also gonna see if I can force the ABS to actuate and see if it still works.

Last edited by ylekyote; 06-08-2016 at 01:43 PM.
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post #7 of 8 (permalink) Old 06-08-2016, 03:43 PM Thread Starter
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I discovered the noise is the nitrogen filled Brake Accumulator. According to Mitsubishi HQ it's a non-essential part that imposes no safety problems and only symptom is the chirping "urk urk urk urk" noise and MAYBE a firmer than usual pedal sometimes (but I've not noticed that yet).

It IS NOT a "recall" but only a warranty extension for 10 years or 100,000 miles, which ever is first.

So I'm glad. Anything that doesn't require a fix is welcomed!
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post #8 of 8 (permalink) Old 06-09-2016, 08:02 AM
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Thanks for posting solution.
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