Maniak said:
The 91 does have ABS, but only rear ABS..
I don't know about an ABS pump though..
~Mark
RABS has no pump. theres a sensor in the rear pumpkin and a valve on the drivers side framerail.
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FROM ALLDATA
Service and Repair
NOTE: Bleed primary and secondary hydraulic brake systems separately, bleeding the longest line first on each system. Do not allow reservoir to run dry during bleeding operation. Never reuse fluid that has been drained from the hydraulic system.
NOTE: On Rear Anti-Lock Brake Systems (RABS) it is not necessary to energize the valve electrically to bleed the rear brakes. Follow normal brake bleeding procedures.
1. Loosen master cylinder to hydraulic line nuts and wrap shop cloths around tubing below fitting to absorb escaping brake fluid.
2. Depress brake pedal slowly forcing air trapped in master cylinder out at fitting.
3. Hold pedal down and tighten fittings, then release brake pedal. CAUTION: Releasing the brake pedal before fittings are tightened will allow air to enter the master cylinder.
4. Repeat steps 1 through 3 until air ceases to escape at fittings and brake pedal is firm.
5. Bleed rear brakes as follows:
1. Pump pedal several times, then hold pedal down firmly.
2. With pedal firmly depressed, open bleeder screw on one rear brake until pedal fades, then close bleeder valve.
3. Repeat procedure until a continuous flow of brake fluid is released from bleeder valve.
4. Repeat steps 5a through 5c on other rear brake.
6. Bleed the front brakes using same procedure as for rear brakes.
7. Fill master cylinder to 1/4 inch from top of reservoir or to the proper fill line indicated on the fluid reservoir.
8. Centralize pressure differential control valve, if applicable, as follows:
1. Turn ignition switch to ``ACC'' or ``On'' position.
2. Push brake pedal down, allowing piston to center itself, turning off warning light.
3. Turn ignition switch off position.
9. Check brake operation and ensure pedal is firm, then road test vehicle.
