Odd brake issue

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JayG
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Odd brake issue

Post by JayG » Sat Oct 10, 2020 5:41 pm

The brakes in my 996 have been acting odd. ABS kicks in sometimes when coming to a stop and I'm not standing on the brakes at all.
They also sometimes when braking, the pedal drops a tiny bit, almost like slipping. The brakes work and do stop the car. The car does not have PSM

I just put new tire on all around. Replaces the worn, but not corded, just at the wear bars A/S 3's (that I hated) with Nankang AS tires. Don't flame me for buying a $400 set of 19" all season tires for the 996. The Nankangs actually feel really good is some lite canyon carving

What is really weird is the braking problem I was having is gone!. The brakes feel great, stop on a dime and no odd ABS activation.

While I ham happy the brakes are proper, I'm at odds how replacing the tires could have "fixed" it

Thoughts???
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY (sold)
2004 996 Targa Tip
2020 BMW X3 Xdrive, 2004 F-150 "Big Red"

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5chn3ll
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Re: Odd brake issue

Post by 5chn3ll » Sat Oct 10, 2020 6:00 pm

If the ABS is firing inappropriately, I’d start with the reluctor/sensor for the affected channel(s).

https://rennlist.com/forums/996-forum/5 ... ensor.html

I’m guessing the rattle gun at the tire shop jiggled things around enough to make the sensor sense correctly again, at least for a while...

Understeer: You will hit the wall with the front end.
Oversteer: You will hit the wall with the rear end.
Horsepower: How hard you will hit the wall.
Torque: How far you will move the wall.

Gone hunting with Alec Baldwin and Dick Cheney. Back soon.

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gnat
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Re: Odd brake issue

Post by gnat » Sat Oct 10, 2020 6:29 pm

Also try a simple fluid flush. Had similar weirdness in the e90. Shop couldn't find anything, but flushed the brake fluid and the brakes have been solid since.

JayG
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Re: Odd brake issue

Post by JayG » Sat Oct 10, 2020 8:08 pm

5chn3ll wrote: Sat Oct 10, 2020 6:00 pm If the ABS is firing inappropriately, I’d start with the reluctor/sensor for the affected channel(s).

https://rennlist.com/forums/996-forum/5 ... ensor.html

I’m guessing the rattle gun at the tire shop jiggled things around enough to make the sensor sense correctly again, at least for a while...
Could be. I was thinking it could have been an ABS sensor.
However, I have checked with my durametric multiple time and never got any errors
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY (sold)
2004 996 Targa Tip
2020 BMW X3 Xdrive, 2004 F-150 "Big Red"

JayG
OG (First 100 Outposters!)
Posts: 391
Joined: Sat Jan 27, 2018 10:22 am
Location: Austin (Lago Vista) and the Desert

Re: Odd brake issue

Post by JayG » Sat Oct 10, 2020 8:09 pm

gnat wrote: Sat Oct 10, 2020 6:29 pm Also try a simple fluid flush. Had similar weirdness in the e90. Shop couldn't find anything, but flushed the brake fluid and the brakes have been solid since.
Did a full flush when I first started having the problem, and still had the problem
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY (sold)
2004 996 Targa Tip
2020 BMW X3 Xdrive, 2004 F-150 "Big Red"

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