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1. Check fluid level, refill and bleed as necessary.
2. Does the brake pedal stick down? If yes then replace or rebuild the Master Cylinder.
3. If the pedal does not stick down and you have completed step 1, search the system for leaks.
4 If there are no leaks, ensure that the vacuum line is still connected properly to the Brake Booster and there is sufficient vacuum present.
5. Check for proper adjustment of he brake pedal
6. If the Brake Booster is getting vacuum and all steps above have been done, replace the Brake Booster.
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1988 GXL
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