02-16-2022, 12:15 PM
I've read all i can find in the 968 forums on the above topic and still have some questions I hope you can help resolve. First, I just got my 1994 Cab back from six months at the body shop after an off road incident. I found that the brake warning light was on (parking brake switch didn't help), ABS warning was on and the speedo didn't work. All were OK before the "incident". After jacking onto jack stands, removing wheels, the pads and wear sensors all look OK. But rear rotors are worn (have ridges), so I'll replace rotors and pads and maybe wear sensors.
First question: Is there a trick to removing the wear sensors without destroying them? Pad backing plates have a small tab that appears to require a troublesome lateral movement before pulling out. Also, the plug connectors on the wear sensors are a cylindrical shape, about 1 in diameter, held in place by a black plastic strap, and the plugs on the replacements pictured on Pelican appear much smaller, with a figure 8 shape, so may not plug into the chassis wiring. I broke the LF wear sensor plug trying to pull what looked like a plug for wear sensor out of the white cylindrical piece. This makes me consider straight wiring the sensors at the plug and doing away with the sensor function. Did that on my '88 911 and it works fine (no ABS on that car though).
Second question: In deference to the heightened electrical complexity in the 968, will wiring past the sensors work to eliminate this from the possible causes for brake warning light and/or ABS/speedo issues?
In checking prices today, the speed sensor for the left front is about $200, and the ABS relay is about $100. So plan is to buy the cheaper of the two (relay) and hope, then spring for the front speed sensor (more hope), but then there are the other three speed sensors. I have a decent volt meter, so is there a quick check these items to see if the work before replacing them?
Third question: I've read on this forum about the ABS pump, and perhaps some associated electrical items near it, but so far have not found details on accessing, removal, checking. Any suggestions on this?
Last question: The off road incident involved a 180 degree spin with a short backward run, although clutch and brakes were in at that point. Could this have affected ABS system (pump perhaps)?
Many Thanks.
First question: Is there a trick to removing the wear sensors without destroying them? Pad backing plates have a small tab that appears to require a troublesome lateral movement before pulling out. Also, the plug connectors on the wear sensors are a cylindrical shape, about 1 in diameter, held in place by a black plastic strap, and the plugs on the replacements pictured on Pelican appear much smaller, with a figure 8 shape, so may not plug into the chassis wiring. I broke the LF wear sensor plug trying to pull what looked like a plug for wear sensor out of the white cylindrical piece. This makes me consider straight wiring the sensors at the plug and doing away with the sensor function. Did that on my '88 911 and it works fine (no ABS on that car though).
Second question: In deference to the heightened electrical complexity in the 968, will wiring past the sensors work to eliminate this from the possible causes for brake warning light and/or ABS/speedo issues?
In checking prices today, the speed sensor for the left front is about $200, and the ABS relay is about $100. So plan is to buy the cheaper of the two (relay) and hope, then spring for the front speed sensor (more hope), but then there are the other three speed sensors. I have a decent volt meter, so is there a quick check these items to see if the work before replacing them?
Third question: I've read on this forum about the ABS pump, and perhaps some associated electrical items near it, but so far have not found details on accessing, removal, checking. Any suggestions on this?
Last question: The off road incident involved a 180 degree spin with a short backward run, although clutch and brakes were in at that point. Could this have affected ABS system (pump perhaps)?
Many Thanks.
