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  • #1

    Brake test

    I had new pads and rotors put on my car. I drove to an clear area and slammed on the brakes at 50 mph. It left 4 streaks of rubber and the smell of burning rubber in the air. I thought that ABS would prevent this from happening. Are my brakes, broke?


    Bob


    99 Silver Z28 A4, T tops, ZR-1 wheels (SOLD)
    Tags: None
  • #2
    Is your ABS light on? That would indicate a problem with the system.

    Does your ABS light come on before you start the engine for several seconds?

    Maybe the ABS bulb is burnt out in your gauge cluster?
    Tracy
    2002 C5 M6 Convertible
    1994 Z28 M6 Convertible
    Current Mods:
    SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids

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    • #3
      theory: Maybe, if you are stopping all 4 wheels simultaneously, the ABS cannot detect a speed difference between wheels, and doesn't limit braking force to any one wheel that is slowing down out of proportion to the rest-
      2001 Z28 A4 - 160 deg t-stat, 3.42 gears, WS6 sway bars, rear springs and shocks, UMI SFC's, Torque Arm and STB, leather Firebird seats, Borla, SLP Y-pipe and lid, ZO6 cam and springs - 332 RWHP and 346 RWTQ, not bad for 'almost stock' - work in progress
      "Black, the fastest color"

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      • #4
        ABS lamp not lighting during ignition on or engine start. So I assume it isn't working at all. Thanks.


        99 Silver Z28 A4, T tops, ZR-1 wheels (SOLD)

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        • #5
          I can tell you one goofy way to test the ABS system to see if it is active. Put the rear end up on jack stands. Start the car, put it in gear and get it up to 25 mph for a minute. The computer will see the front wheels are stopped and it will light the ABS light. Every time I had to get my emission checked on the 95 they put it on a load machine and it would light the ABS light. When we got through I had to turn off the car and restart it to reset the ABS system.
          2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

          1995 Z28, many mods, SOLD

          A proud member of the "F-Body Dirty Dozen"

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          • #6
            Do they sell EBCM scanners for home mechanics?
            -Ryan-


            1997 Pontiac Firerbird Formula LT1/T56
            2006 Pontiac G6 GTP, 3.9L V6, 6-spd

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            • #7
              Originally posted by Wild Willy
              theory: Maybe, if you are stopping all 4 wheels simultaneously, the ABS cannot detect a speed difference between wheels, and doesn't limit braking force to any one wheel that is slowing down out of proportion to the rest-
              If that was the case, ABS basically would be useless, exactly when you needed it. The system also considers the rate at which the wheels are decellerating, when individual wheel speed is approaching zero, etc.
              Fred

              381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

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              • #8
                Well I took my car to what passes as a "goodwrench" shop here. I also brought Volume 1 of the service manual. They did "tests" and scanned it. I was told the the rear speed sensor needs to be replaced. I will have to order this from the states (GM 10456115). The light still won't light. I wonder if the bulb is out. I will have to take a look. Anybody know what bulb it takes?

                Bob
                Kuwait


                99 Silver Z28 A4, T tops, ZR-1 wheels (SOLD)

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                • #9
                  I just looked up the code for rear speed sensor C0050 which should also set the brake warning light, which works and is not on. The sensor resistance indicates almost a short condition.

                  Bob
                  Kuwait


                  99 Silver Z28 A4, T tops, ZR-1 wheels (SOLD)

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