Intro to Disc Brakes

Most Common - Floating

Floating Disc Brake

Newton’s Law

Sliding – No Bolts

Sliding

Fixed – Caliper Does Not Move

Carbon Ceramic

Fixed Operation

Drum-In-Hat Parking Brake

Inside the Caliper

Caliper Piston Seal Flexes as piston moves out Pulls the piston back when brakes released Seals fluid self-adjusting

Brake Pads Backing plate Lining (pad) Wear indicators Clips, springs, hardware

Removing the Pads Remove brake fluid from m/c Retract piston first Remove caliper bolts Move caliper out of the way

Support Caliper Once removed, support caliper on wire or bungee cord Never let the caliper hang by hose

Pad Inspection

Brake Rotors Also called discs Rotating friction surface Vented for cooling

Heat Dam

Rotor Inspection

Just Started Making Noise

Parallelism / Thickness Variation

Runout

Runout Measurement

Economy Rotors

Burnish/Break-In Procedures Necessary to properly seat pads and rotors – Transfers a layer from the pads to the rotors Improves brake performance – Smoothes the mating surfaces – Heat cycles the pads and rotors Reduces noise

Procedures Vary - RTM For “normal” street service: 8 to 10 moderate applications from mph is sufficient. Allow the brakes to cool for at least 15 minutes either by parking the vehicle or continuing to drive at moderate speeds with minimal brake applications.

Procedures cont. Make approximately 20 complete stops from 30-mph or 20 “slow downs” from 50-mph to 20-mph with light to moderate pedal pressure NO PANIC STOPS · Allow at least 30 seconds between brake applications for the brake pads or shoes to cool down No high speed stops and/or braking under heavy loads that could result in glazed or otherwise damaged linings

30/30/30 Procedure Perform 30 stops from 30 miles per hour with a 30-second cooling interval between stops. Performed at a decelerating rate of 12 feet per second or less. This means that it should be a gentle easy stop. The 30/30/30 Burnish Procedure beds the pads and shoes into the rotor and drums. It also deposits the necessary friction transfer to the rotors and drums for optimum brake performance.