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Old 02-12-2013, 11:43 PM #1
worrgames_slaya
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Diagnose my car problem

I know everyone here are very wealthy professional racecar drivers and master mechanics. Thanks in advance for your insight to my problem.

This started today:
When I stop and put any amount of significant pressure on the brakes, I can feel and hear a grinding through the pedal. Kind of pushes back like the abs but like metal on metal.

1.) changed the rotors and brake pads fairly recently
2.) brake fluid could use a flush
3.) don't live in the snow but spent time up north in the snow for new years
4.) sees mud quite often
5.) no dummy lights are on

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Old 02-13-2013, 12:10 AM #2
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Tear it apart and see if something was installed wrong? Make, model, year and trim? Mileage?
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Old 02-13-2013, 12:15 AM #3
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I did the rotors and pads myself so I believe it's all good. They've been working fine for months.

Jeep Liberty with like 70k on it.
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Old 02-13-2013, 12:16 AM #4
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Conditions when it occurs? More accurate description is needed.
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Old 02-13-2013, 12:18 AM #5
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Any time I put significant pressure on the brakes. Like slowing down to the car in front of me it won't grind, but slowing down alot for a turn it will. Seems to happen more at lower speeds to a crawl but I don't really know since I've only driven it twice today since it started.
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Old 02-13-2013, 12:20 AM #6
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pull abs fuse and see if it still occurs to rule out abs problem or not
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Old 02-13-2013, 12:21 AM #7
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I'm thinking wheel speed sensor.
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Old 02-13-2013, 12:21 AM #8
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Quote:
Originally Posted by lowbudgethero View Post
pull abs fuse and see if it still occurs to rule out abs problem or not
smart guy here. I'll try that tomorrow.
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Old 02-13-2013, 12:22 AM #9
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Quote:
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I'm thinking wheel speed sensor.
then it will be fixed by pulling the fuse, though you will have no abs
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Old 02-13-2013, 01:08 AM #10
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Did you have uneven pad wear inside/outside on any corner?

Could be a stuck caliper or ****ty slider pins
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Old 02-13-2013, 09:09 PM #11
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****ty aftermarket pads.
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Old 02-13-2013, 09:24 PM #12
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Fixed by pulling the fuse. Couldn't figure out which wheel speed sensor needs replacing so I took it to the dealership to fix. I'm letting them do my lower ball joints while they're at it cause those things are a pain in the ***.
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Old 02-13-2013, 11:36 PM #13
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Wheel speed sensor causing grinding in the pedal but no squealing sound? I doubt it, plus if it were the sensor it'd do it whether or not the ABS was active.
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Old 02-13-2013, 11:45 PM #14
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Pulling the abs valve fuse includes the wheel speed sensors, speedometer and tachometer.

Grinding due to improper activation of abs/bas/esp/stability/roll-over.
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Old 02-13-2013, 11:51 PM #15
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How do you improperly active ABS and cause a grinding that normal activation of the ABS wouldn't cause? It doesn't add up. ABS pulses the the brake calipers so if the grinding were somehow caused by feedback within the distribution block you'd feel it every time ABS activates. If you pull the fuse and don't feel the same grinding then it's in the ABS but a wheel speed sensor won't cause grinding unless it's contacting the reluctor wheel in which case it would always cause the grinding.
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Old 02-14-2013, 12:08 AM #16
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I think the "grinding" was the abs activation for no reason when abs activates it sounds like a grinding noise to me. A bad sensor or computer can cause improper sin waves to be read and thus activating abs when not intended.
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Old 02-14-2013, 05:17 AM #17
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Quote:
Originally Posted by F1VENOM View Post
How do you improperly active ABS and cause a grinding that normal activation of the ABS wouldn't cause? It doesn't add up. ABS pulses the the brake calipers so if the grinding were somehow caused by feedback within the distribution block you'd feel it every time ABS activates. If you pull the fuse and don't feel the same grinding then it's in the ABS but a wheel speed sensor won't cause grinding unless it's contacting the reluctor wheel in which case it would always cause the grinding.
On many vehicles when ABS activates, it sounds like grinding as the valves inside the pump are pulsed.
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Old 02-14-2013, 10:33 AM #18
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Quote:
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Wheel speed sensor causing grinding in the pedal but no squealing sound? I doubt it, plus if it were the sensor it'd do it whether or not the ABS was active.
Wheel speed sensor false reporting = ABS system sees different wheels moving at different speeds while braking = it engages even when traction is not lost = derpy pedal feel and ABS system noises
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Old 02-14-2013, 12:40 PM #19
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Dealership can't replicate the problem. Some how I drove it there with the brake grinding everytime I stopped, yet now it magically works fine. They quoted me at about $3000 in other maintenance it needs though.

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Old 02-14-2013, 01:33 PM #20
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you can do one of two things:

1. leave fuse in until the sensor/control unit/ect fully fails and you get the ABS light that they can actually find a code for

2. leave the fuse out and drive w/o abs
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Old 02-14-2013, 01:52 PM #21
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You in the market for a Si now possibly?
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