Dana®Spicer ® Brakes Brake Systems Troubleshooting Guide BRTS-0300 November 1994 For the most current information, visit the Roadranger web site at www.roadranger.
for pdf
General Information Table of Contents Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Use this Manual . . . . . . . . . . . .
General Information Foreword 2. Use the left-hand column as a checklist. Check each item on the list. If an item is found to be defective, perform the corresponding action prescribed in the right-hand column. (For example, noise may be caused by a bent brake spider. The recommended action is to replace the spider.) Purpose This Eaton manual is intended as a diagnostics guide for technicians involved in the servicing of Eaton EB and ES Model Brakes. 3.
WARNING ! DANGER AVOID CREATING DUST POSSIBLE CANCER AND LUNG DISEASE HAZARD While Eaton does not offer asbestos brake linings, the long-term effects of some non-asbestos fibers have not been determined. Current OSHA Regulations cover exposure levels to some components of nonasbestos linings but not all. The following precautions must be used when handling these materials. 1. AVOID CREATING DUST. Compressed air or dry brushing must never be used for cleaning brake assemblies or the work area. 2.
BRAKE SYSTEMS DIAGNOSTIC GUIDE ES/EB-150-4L 4
BRAKE SYSTEMS DIAGNOSTIC GUIDE ES-150-8D, F 5
BRAKE SYSTEMS DIAGNOSTIC GUIDE EB/ES-165-7L,D 6
BRAKE SYSTEMS DIAGNOSTIC GUIDE ACTION (SERVICE MANUAL SECTION) Dragging brakes See DRAGGING BRAKES Insufficient lining-to-drum contact: • Bell-mouthed drum condition • Poor surface condition of drum • Bent brake spider • Bent or stretched brake shoe • Loose wheel bearing • Worn or damaged camshaft • Improper lining grind Replace drum (3,6) Rebore or replace drum (3,6) Replace spider (3,6) Replace shoe (3,6) Torque spindle nuts and check end play (6) Replace camshaft (3,6) Grind linings t
BRAKE SYSTEMS DIAGNOSTIC GUIDE 8
BRAKE SYSTEMS DIAGNOSTIC GUIDE POTENTIAL CONDITION/CAUSE ACTION (SERVICE MANUAL SECTION) Inadequate air supply to chamber: • Old or broken lines • Pinhole leaks in air chamber line • Loose or damaged fittings • Air line inner lining separation Separation: • Plugged lines • Contamination Remove blockage Remove contamination Valve problems: • Worn valves • Internal component failures • Seals/O-rings damaged • External vents blocked Governor failure: • Incorrect set point • Contami
LONG STOPPING DISTANCES BRAKE SYSTEMS DIAGNOSTIC GUIDE POTENTIAL CONDITION/CAUSE ACTION (SERVICE MANUAL SECTION) Slack adjuster not functioning properly: • Bushing worn • Spline damaged • Worn or damaged internal parts • Incorrect slack window (auto slacks) Overadjustment/underadjustment: • Contamination of internal parts (auto slacks) • False feedback to slack adjuster due to degraded foundation brake components (see below) • Severely glazed or worn linings Replace bushing (3,6) Replace slac
BRAKE SYSTEMS DIAGNOSTIC GUIDE Dragging brakes See DRAGGING BRAKES Check brake adjustment Grabbing or pulling brakes: • Grease, oil or dirt on linings • Glazed linings • Cam bracket seal failure • Brake linings not a balanced set, different codes, or lining brand • Loose or broken linings • Brake drum out-of-round • Defective brake drum • Camshaft binding at one or more wheels • Defective slack adjuster • Uneven brake adjustment (side-to-side) • Broken or bent part(s) • Loose spider or drum mounting bo
BRAKE SYSTEMS DIAGNOSTIC GUIDE 1.) Scoring 2.) Severe Heat Checking (Drum cannot be turned to eliminate heat cracks) CRACKED DRUMS VEHICLE PULLS/ 3.) Cracking Through Hat Section 4.
BRAKE SYSTEMS DIAGNOSTIC GUIDE ACTION (SERVICE MANUAL SECTION) Blockage in air lines preventing air chamber from exhausting: • Air line inner lining separation • Plugged lines • Contamination • Damaged fittings Replace line Remove blockage Remove contamination Replace fittings Air valves sticking: • Seals/O-rings damaged • External vents blocked • Contamination • Worn valves/internal component failures Replace seals/O-rings Remove blockage Remove contamination Repair or replace as req
DRAGGING BRAKES PARKING BRAKE WILL NOT HOLD/ BRAKE SYSTEMS DIAGNOSTIC GUIDE POTENTIAL CONDITION/CAUSE ACTION (SERVICE MANUAL SECTION) Incomplete release of air chamber after service application: • Incorrect clevis position • Incorrect bracket slot • Damaged pushrod • Air chamber return spring failure • Road debris damage • Blockage in other upstream air system parts Reposition clevis (6) Reposition on correct bracket slot (6) Replace air chamber (3,6) Replace air chamber (3,6) Repair damag
BRAKE SYSTEMS DIAGNOSTIC GUIDE Insufficient pushrod free travel: • Pushrod length too long • Incorrect installation of slack adjuster Shorten pushrod to proper length Perform correct installation procedure (6) Overadjusted slack adjuster: • Incorrect in-service adjustment (manual) • Incorrect setup of external reference control arms (Eaton-Haldex) • Incorrect slack window (auto slacks) • Contamination of internal parts (auto) • False feedback to slack adjuster (review all foundation br
Brake Shoe BRAKE SYSTEMS DIAGNOSTIC GUIDE ES-165-7H, M 16
BRAKE SYSTEMS DIAGNOSTIC GUIDE POTENTIAL CONDITION/CAUSE ACTION (SERVICE MANUAL SECTION) Dragging brakes See DRAGGING BRAKES Poor lining-to-drum contact.
NOTES: 18
for pdf
Copyright Eaton and Dana Corporation, 2002. EATON AND DANA CORPORATION hereby grants its customers, vendors, or distributors permission to freely copy, reproduce and/or distribute this document in printed format. THIS INFORMATION IS NOT INTENDED FOR SALE OR RESALE, AND THIS NOTICE MUST REMAIN ON ALL COPIES. The Roadranger® System is an unbeatable combination of the best products from Eaton and Dana -- partnering to provide you the most advanced, most trouble-free drivetrain in the industry.
