The primary indicator of a faulty brake booster is a stiff brake pedal. If it takes more force than usual to bring the vehicle to a stop then possibly the brake booster is failing or has failed completely. Omix offers quality replacement brake boosters to help you get your Jeeps braking system operating at its full potential. This power brake booster fits 95 - 98 Grand Cherokee ZJ models. (For replacement brake master cylinder, use 16719.23). Includes check valve. Replaces OE 4761786