Grand Cherokee Brake Problems

The Jeep Grand Cherokee was manufactured with four-wheel disc brakes in later model years, and the components can wear out and require replacement periodically, simply due to regular driving. You can find out exactly what the problem is with the braking system, using minimal tools and skill, in less than an hour, generally.

Listen for Noises

The most common problem with worn braking components is a squealing sound emanating from the wheels. This is due to the design of the Grand Cherokee's brake pads, which incorporate a metal flange that will scrape the rotor when the pad's material wears below a usable level. This is to alert the driver of worn pads, which should be replaced immediately. Another sound that is common is the metallic grinding of a badly worn rotor, when the caliper presses the pads against it. Damaged or worn rotors can be a serious hazard; do not drive the Jeep in this condition.

Inspect the Brakes

The best way to determine the cause of a problem is to physically inspect the braking system by removing the wheels and looking at the rotors, calipers, and pads. It should be easy to turn the rotor by hand, and the pads should not make any noises during its revolution. Pressing on the brake pedal should stop the rotation, and the rotor should be free of rust and debris. The master cylinder, located underneath the hood in front of the driver, should have a full and level fluid reservoir. The master cylinder can be filled with DOT-3 braking fluid by uncapping the plastic top and carefully pouring fluid into it.

Operate the Brakes

The brake pedal should be firm and constant, applying pressure to the brakes in an even and controlled manner. If the brakes are "spongy", or lack proper tension, then there could be air in the brake lines. This air can be forced out and replaced with brake fluid by bleeding the lines. The individual bleeder nipples are located in the rear of the caliper, and can be turned in a counterclockwise direction to open the lines up. Press the brake pedal while refilling the master cylinder, pushing old fluid and air out of the bleeder nipple. Once the fluid coming out of the nipple is clean and constant, secure the nipple by turning it clockwise. If the pedal is excessively firm, then the master cylinder's internal seals and components could be damaged and require replacement.

Brakes at speed

The braking system could experience "dragging", pulling to one side, or a harsh vibration when used at speed. This can be caused by a defective or damaged rotor, or a seized caliper. The rotor must maintain a perfectly round surface, and when it is heated and cooled beyond the manufacturer's specifications damage can occur in the form of "warping". This warped rotor will not rotate well, and will catch the pads and cause a vibration. A seized caliper can cause dragging, as it will not release the pads completely, and most times it must be totally replaced with a new unit as they are not typically serviceable.

Glazed Rotors

A more common problem with the Jeep's rotors and pads is "glazing", or heat damage to the surface of the components caused by excessive braking (usually in downhill conditions). Different from warping, glazing can cause the surface of the rotor or pads to become smooth, giving decreased performance or even a total lack of braking ability. You must replace the damaged parts, as they cannot be repaired.