Question about 1990 Buick Reatta

3 Answers

Abs brake problems

Brakes will lock up, are a bit hard to pedal, getting code 48 wheel sensor; but, all sensors check OK for resistance etc. Power brake module seems to wok??? Suggestions, please.

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  • Anonymous Mar 28, 2014

    I cannot get a full brake pedal no matter what I try. System seems to dump brake line pressure to the rear brakes. This a non abs system. 4 wheel disc.

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The code 48. Is Not for a SPEED Sensor.
The DEFINITION for Code 48 IS:
RIGHT FRONT MOTOR SPINS FREELY.
Is refer to the motor of the Anti lock brake Assemble.
An intermitent code 48 for a mechanical part of System wich,
Sticks, bind or slip. ON the Hydaulic Anti lock motor.
Or Anti lock brake module assemble.
1 problem could be if you have replaced the brake master Cylinder. and you have removed the ABS module.
And lost the timing on the ABS motor sprokets.

FIrst Bleed all the 4 tires and the brake master cylinder.
Because Air trapped on the system can be a problem on the ABS. system.
Check if is not leak on any of the cylinders and callipers.

If everything is OK.. I recomend replace the ABS MOdeule.

OK.. I hope this can help on your problem.
any more information I will able to give it.

Posted on Aug 01, 2008

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Code 48 is used for diagnostic purposes only. It does indicate component malfunction/falure like what is happening on your brake..

Posted on Aug 01, 2008

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Its a sensor that needs changing, Even if the resistace is ok, dosent mean its pulsating and sending the correct signals.,, you already know the problem, the solution is you have to change the sensor.

Posted on Aug 01, 2008

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Visual Inspection Chart
Mechanical Electrical

  • Base brake system
  • Brake booster vacuum hose
  • Hydraulic control unit (HCU)
  • Steering components and suspension components
  • Tire size
  • Wheel speed sensor ring
  • ABS module
  • Battery junction box (BJB) fuse(s):
    • 19 (40A)
    • 22 (40A)
  • Brake fluid level switch
  • Brake pressure transducer
  • Smart junction box (SJB) fuse(s):
    • 6 (15A)
    • 34 (5A)
  • Stoplamp switch
  • Wheel speed sensor
  • Wiring, terminals or connectors


You may need to have the dealer run a scan test to determine the DTC fault codes. Then go from there. Autozone can't read these codes as tehy are chassis codes. They only can read powertrain codes.

Good luck. please rate.

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The car is safe to drive as long as you recognize that it will now be possible to lock up your wheels under hard braking or when braking in slippery conditions where the tires have poor grip.

The problem with the ABS malfunction is that you no longer have an anti -lock assistance on the brake system so in certain conditions, such as on a wet road, you will be able to lock up the wheels on the car when you brake hard. The anti-lock system identifies and retards lock up (by releasing brake pressure on a wheel or wheels) and allows the wheels to keep turning slowly even when you have full pressure being applied on the brake pedal.

The ABS system relies on sensors and if one or more fails you will get an ABS warning. It could be a faulty or dead sensor but it is impossible to say without testing and inspecting the vehicle.

The ABS has it's own fuse so you can check the fuse box in the car to ensure the fuse has not blown. The fuse location is shown in the car's owner's manual. A blown fuse would trigger a warning.

You should take the car to a competent brake specialist to have it checked and the problem rectified.

It's much safer to have the ABS in operation.

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Hi i'm freddy and i have a problen with my gmc jimmy 98 .the abs light come on sometimes ,the brake pedal is to hard and doesn't stop,when i make turn right it makes a noise at the front wheels. and some...


hi it could be any one of those you have mensioned but i would suggest the most likely cause would be that the brake pads have completley worn down and are just working metal on metal so you need to get the pads changed sooner rather than later.
Also the brakes being gone would also cause the light to come on as the abs wouldnt function properly with the pads worn off.

The first thing i would do is get the brakes checked as you wil probably find this is the cause of your problem as you say the pedal is hard to press this would suggest that the pads do need changing if it is the brakes then this is the cheapest of all the options you mentioned above.
So please get the brakes checked as at the moment it might just be that the pads need replacing but driving around to long will cause you to put grooves into the disks themselves and these are expensive to replace so get it check soon as you can.

Let me know how you get on or if you need further assistance ok

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