Peterbilt 357/378 Brake Parts & Acc.

Frequently Asked Questions About Peterbilt 357/378 Brake Parts & Acc.

What years do these brake parts fit for Peterbilt 357 and 378 models?

Our brake parts and accessories are designed to fit Peterbilt 357 models from 1987-2002 and Peterbilt 378 models from 1986-2007. However, there can be variations based on specific brake system configurations. We recommend checking your VIN or calling our tech support at 1-888-875-7787 with your truck's serial number to confirm exact fitment before ordering.

Are these DOT approved brake components, and what's the quality difference between OEM and aftermarket options?

Yes, all brake components we carry meet or exceed DOT safety standards and FMVSS regulations. Our OEM parts are manufactured by the original equipment suppliers, while our aftermarket options come from trusted brands like Bendix, Meritor, and Gunite. The main differences are price (aftermarket typically 20-40% less) and availability. Both options provide reliable stopping power, though OEM parts may offer slightly longer service intervals.

What tools and experience level are needed to install brake shoes, drums, or chambers?

Brake component installation requires intermediate to advanced mechanical skills and specific tools including a brake spring tool, drum puller, torque wrench (450-500 ft-lbs capacity), and proper jack stands. Air brake systems also require proper bleeding procedures and adjustment. We strongly recommend professional installation for safety-critical components. Most shops charge 2-4 hours labor for complete brake service.

How do I know when to replace slack adjusters versus just adjusting them?

Replace slack adjusters when you notice excessive play (more than 1/8 inch at the clevis pin), visible wear on the splines, or if automatic adjusters won't maintain proper brake stroke. A properly functioning slack adjuster should keep pushrod travel between 1.5-2 inches. If you're constantly readjusting or hearing brake squeal despite proper adjustment, replacement is needed. Always replace in axle sets for balanced braking.

What's included in a complete brake overhaul kit versus buying parts separately?

Our complete brake overhaul kits typically include brake shoes with hardware, drums, slack adjusters, chambers, and cam bushings for one axle. Buying a kit saves 15-25% compared to individual parts and ensures all components are matched for optimal performance. Individual parts are best when doing spot repairs or if you need specific upgraded components like extended-life drums or severe-duty shoes.