Here's a breakdown of what changing the brake system could entail, and the associated difficulty:
Relatively Simple Changes (DIY-able with some mechanical knowledge):
* Brake Pad Replacement: This is the most common "brake system change" and relatively straightforward. Requires basic tools and jack stands. Many online guides and videos detail this process.
* Brake Rotor/Drum Replacement: More involved than pad replacement, this still falls within the realm of a capable DIYer. Requires more tools and potentially a wheel hub puller.
* Brake Caliper Replacement: Moderately difficult, requiring bleeding the brakes afterward. Improper bleeding can lead to poor braking performance.
* Brake Fluid Flush/Bleed: Essential after replacing any brake components and should be performed periodically regardless. Can be done solo but easier with a helper.
* Brake Hose Replacement: Relatively straightforward, but requires careful attention to avoid leaks.
More Complex Changes (Requires Significant Mechanical Expertise or Professional Help):
* Master Cylinder Replacement: Critical component; improper installation can lead to brake failure. Requires careful bleeding and precise procedures.
* Brake Booster Replacement: Another crucial component impacting braking power. Requires careful handling and knowledge of vacuum systems.
* ABS System Repair/Replacement (if equipped): This is a very complex system requiring specialized tools and diagnostic equipment. Best left to professionals unless you have significant experience with automotive electronics and hydraulics.
* Complete Brake System Upgrade: This involves replacing virtually every component, from calipers and rotors to lines and master cylinder. This requires extensive mechanical knowledge and is a very time-consuming project.
Before attempting any brake work:
* Consult a repair manual: A Haynes or Chilton manual specific to your 1989 Mercury Mark VII is invaluable.
* Gather the necessary tools: Don't start until you have everything you need.
* Safety first: Use jack stands, chocks, and safety glasses. Never work under a vehicle supported only by a jack.
* Bleeding the brakes properly is critical: Air in the brake lines can lead to catastrophic brake failure.
In short, you *can* change parts of or the entire brake system on your 1989 Mark VII, but the complexity and feasibility depend entirely on the specific changes you intend to make. For anything beyond simple pad or rotor replacement, seek professional help if you lack the necessary experience. Improper brake repair can be extremely dangerous.
