One problem related to power assist brake vacuum has been reported for the 1998 Mercedes Benz Sl Class. The most recently reported issues are listed below.
The brake system vacuum booster did not hold the vacuum and caused a hissing noise when the brakes were applied. The brake warning light never illuminated to indicate a problem. The consumer requested a refund for a portion of the repair cost. Ph.
| Brake Foundation Components problems | |
| Power Assist Brake Vacuum problems | |
| Power Assist Brake problems | |
| Service Brakes problems |