Mechanics

BRAKES/TRACTION

2006 Cadillac DTS • V8 • 92,000 miles

2006 DTS ABS and wheel traction dash lights come on always together and at random times. At low speed 5-10 mph depress brake pedal and feel slight give in pedal and grind noise while pedal is depressed. At high speed 50 mph slight hesitation when dashlights come on had complete brake/rotors changed no change
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Arb1002
June 28, 2011.




Check fluid level and condition in the brake master cylinder. If it's got sludge on the bottom (use a screwdriver to check) flush it with denatured alcohol and replace with clean, fresh fluid.
Have the codes scanned. Check the air gap on the wheel and vehicle speed sensors.


Rivermikerat
Jun 28, 2011.
Will clean and change fluid will get back with you thanks


Tiny
Arb1002
Jun 29, 2011.
My pleasure.


Rivermikerat
Jun 29, 2011.
Had fluid flushed and changed, speed sensor was ok brake pedal is high and firm, great. Now the abs and traction dash lights remain on but go out intermittently when making left or right turns


Tiny
Arb1002
Jun 29, 2011.
The lights flashing intermittently may be because the computer stored fault codes and just needs to have the memory cleared.
The brake light flashing could also be a short in the parking brake switch or wiring. The fact that the lights go off when making turns leads me to believe that it is a wire shorting out, being pushed against a grounded metal component due to centrifugal and centripetal forces during cornering. Find the switch on the parking brake mechanism and trace it as far as you can, looking for worn or broken insulation. At least wrap any suspect areas with electrical tape. Then, disconnect it from the switch and take it for a drive. If that causes it to not flash, replace the switch.


Rivermikerat
Jun 29, 2011.
Will do will get back thanks


Tiny
Arb1002
Jun 29, 2011.
We'll be here.
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Rivermikerat
Jun 29, 2011.
Ok lets backup a tad. Start car-dashlights on, not flashing. While driving depress brake pedal at stop sign, dashlights off. Turn car wheels- dashlights on. Depress brake pedal at traffic light-dash lights off. Turn into driveway, depressing brake pedal-dashlights on and feel grind in pedal like missing gears (Had both wheel bearings changed when this oringinally started. Dealer and mechanic checked verified A ok)


Tiny
Arb1002
Jun 30, 2011.
Brake pedal grind is usually caused by metal to metal contact in the brake system, but you said the pads and rotors were already changed. Was that just the front or the rear, also?

Check around the steering column for any binding wires or wires that may been frayed or lost insulation near the column. Your car isn't a drive-by-wire type, so it can't be a short in that kind of system. In order for the lights on the dash to be caused to flash, their path to ground has to be completed. I have attached schematic diagrams for the ABS circuit and for the instrument cluster in hopes that they will help you trace the fault.


Rivermikerat
Jun 30, 2011.
Thank you will look over diagrams


Tiny
Arb1002
Jun 30, 2011.

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