What size Allen wrench is needed to loosen the front brakes on a 1998 dodge 1500 4x4?

There's no single Allen wrench size that universally fits all 1998 Dodge 1500 4x4 front brake calipers. The size depends on the specific caliper design used on that particular truck. It could be a 7mm, 8mm, or even a 10mm Allen wrench (or possibly even a different type of fastener altogether).

To find out the correct size:

1. Visually inspect the caliper: Look at the bolts holding the caliper to the caliper bracket. The bolt heads will have the Allen wrench-shaped recesses. Try to visually gauge the size.

2. Use a wrench set: Get a set of Allen wrenches (metric) and try each size until you find the one that fits. Start with common sizes like 7mm, 8mm, and 10mm.

Important Safety Note: Before working on your brakes, make sure you properly secure the vehicle (parking brake engaged, wheel chocks in place) and wear appropriate safety glasses. If you're unsure about any part of this process, it's best to take your vehicle to a qualified mechanic.