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Brake Effectiveness Marking for Brake Blocks - Truck and Bus

Truck and Bus Foundation Brake Committee
  • Ground Vehicle Standard
  • J1801_201906
  • Current
Published 2019-06-06 by SAE International in United States

This SAE Recommended Practice provides the method to assign numerical values of brake effectiveness, using data from single station inertia dynamometer effectiveness tests, and to identify a uniform procedure to mark these values on the edge of brake blocks in excess of 12.7 mm (0.51 in) in thickness.

 
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Brake Block Effectiveness Rating

Truck and Bus Foundation Brake Committee
  • Ground Vehicle Standard
  • J1802_201906
  • Current
Published 2019-06-06 by SAE International in United States

This SAE Recommended Practice provides the test procedure and methods to calculate the effectiveness of brake blocks, using an inertia dynamometer. To minimize testing variability, and to optimize standardization and correlation, a single, high volume size of brake block is specified (FMSI No. 4515E) and evaluated in a reference S-cam brake assembly of 419 mm x 178 mm (16.5 in x 7.0 in) size, using a specified brake drum.

 

iLokTM Nut - An Innovative Fastener that Solves a 30 Year Old Problem for Rear Axle Hub Assemblies

Duraforce Fastener Systems LLC.-Pierre Dionne
Neumayer Tekfor Automotive Brasil Ltda-Paulo Sigoli, Marcelo do Carmo Silva
  • Technical Paper
  • 2019-01-0339
Published 2019-04-02 by SAE International in United States
Truck and bus manufacturers have been constantly facing an issue to disassemble the rear axle shaft from the hub when transporting the truck from the factory to the dealership. In addition to that, the dealerships have the very same problem every time they have to replace the brake pads in some truck models, which leads to excessive service time, extra costs and aftermarket complaints. The current problematic fastening system is composed by a lock nut, a flat washer and a coned slotted bushing. The concept of this 30 year old design involves the coned slotted bushing being pressed against a tapered hole on the shaft’s flange. After tightening the lock nut, the bushing clamps towards the stud and it gets stuck in between the shaft and the stud generating the problem described above. This paper shows the R&D process that Tekfor used to come up with the 1-piece fastener named iLokTM nut that replaces the problematic 3-piece fastening system. The methodology involved (a) Innovation process; (b) CAD modeling; (c) Finite Element Analysis; (d) Forging simulations;…
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Self-Lubrication Improves Standard Braking Systems

  • Magazine Article
  • TBMG-34116
Published 2019-04-01 by Tech Briefs Media Group in United States

By mixing carbon fibers into polymer-based brakes, researchers designed brakes that are self-lubricating. These new and improved brakes can prevent wear-and-tear and have better frictional properties than brakes currently on the market.

 

Effect of Slot and Chamfer Shape of Brake Pad on Mode Coupling

Chulalongkorn University-Sirapath Yeamdee, Thiti Bovornratanaraks, Chanat Ratanasumawong
Compact International (1994) Co., Ltd.-Meechai Sriwiboon
Published 2019-03-25 by SAE International in United States
In the present, one of the essential quality concerns in the automotive industry is brake squeal. Brake pad shape is one of the factors affecting to brake vibration and squeal noise. This research aims to study the effect of slot and chamfer shape on mode coupling through the Finite Element Analysis (FEA), impact hammer testing and performance test from dynamometer. The results can be used to develop geometry of the brake pad surface that leads to brake squeal reduction in the design stage. The natural frequencies and mode shape of brake components calculated by FEA are compared with the impact hammer testing to ensure the accuracy of the results. The FE results are also verified through the standard test with a dynamometer.
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Friction Coefficient Identification and Environmental Marking System for Brake Linings

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J866_201903
  • Current
Published 2019-03-11 by SAE International in United States
This SAE Recommended Practice is intended to provide a uniform means of identification which may be used to classify the friction coefficient of brake linings, based on data obtained from tests conducted in accordance with SAE J661 Brake Lining Quality Test Procedure and SAE J2975 Measurement of Copper and other elements in Brake Friction Materials. NOTE: It is emphasized that this document does not establish friction requirements for brake linings, nor does it designate significant characteristics of brake linings which must be considered in overall brake performance. Due to other factors that include brake system design and operating environment, the friction codes obtained from this document cannot reliably be used to predict brake system performance.
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Off-Vehicle Brake Testing for Service Brakes Over 10000 Pounds GVW Air, Hydraulic, and Mechanical Actuation

Truck and Bus Brake Systems Committee
  • Ground Vehicle Standard
  • J2806_201901
  • Current
Published 2019-01-14 by SAE International in United States
Subject document is specifically intended for service brakes and service brakes when used for parking and/or emergency brakes (only) that are commonly used for automotive-type, ground-wheeled vehicles exceeding 4536 kg (10000 pounds) gross vehicle weight rating (GVWR). Subject specification provides the off-vehicle procedures, methods, and processes used to objectively determine suitability of tactical and combat ground-wheeled vehicle brake systems and selected secondary-item brake components (aka, aftermarket or spare parts), including brake “block” for commercial applications only, specifically identified within subject document. Subject specification is primarily based on known industry and military test standards utilizing brake inertia dynamometers. Targeted vehicles and components include, but may not be limited to, the following: a Civilian, commercial, military, and militarized-commercial ground-wheeled vehicles such cargo trucks, vocational vehicles, truck tractors, trailers, and specialized support and engineering equipment under the generic heading of ground vehicle “dry” brake systems (GVDBS). b Hydraulic, air, and mechanical “dry” disc brake and drum brake systems, when used as service brakes, including service brakes (only), when used as emergency and/or parking brakes. c Hydraulic, air, and…
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Brake Pads, Lining, Disc, and Drum Wear Measurements

Brake Dynamometer Standards Committee
  • Ground Vehicle Standard
  • J2986_201901
  • Current
Published 2019-01-07 by SAE International in United States
This Recommended Practice provides a common method to measure wear of friction materials (brake pad assemblies and brake shoes) and their mating parts (brake disc or brake drum). These wear measurements apply to brakes fitted on passenger cars and light trucks up to 4536 kg of Gross Vehicle Weight Rating under the Federal Motor Vehicle Safety Standard (FMVSS), or vehicles category M1 (passenger cars up to nine occupants, including the driver) under the European Community’s ECE Regulations.
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FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4540 kg GVWR

Truck and Bus Hydraulic Brake Committee
  • Ground Vehicle Standard
  • J2684_201812
  • Current
Published 2018-12-05 by SAE International in United States
This Recommended Practice is derived from the FMVSS 105 vehicle test and applies to two-axle multipurpose passenger vehicles, trucks, and buses with a GVWR above 4540 kg (10000 pounds) equipped with hydraulic service brakes. There are two main test sequences: Development Test Sequence for generic test conditions when not all information is available or when an assessment of brake output at different inputs are required, and FMVSS Test Sequence when vehicle parameters for brake pressure as a function of brake pedal input force and vehicle-specific loading and brake distribution are available. The test sequences are derived from the Federal Motor Vehicle Safety Standard 105 (and 121 for optional sections) as single-ended inertia-dynamometer test procedures when using the appropriate brake hardware and test parameters. This recommended practice provides Original Equipment Manufacturers (OEMs), brake and component manufacturers, as well as aftermarket suppliers, results related to brake output, friction material effectiveness, and corner performance in a laboratory-controlled test environment. The test sequences include different dynamic conditions (braking speeds, temperature, and braking history as outlined in the FMVSS 105);…
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High-Preload Deflection and Compressibility Test Procedures for Friction Materials

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J2468_201811
  • Current
Published 2018-11-12 by SAE International in United States
This standard specifies a method for testing and measuring the deflection of friction materials assemblies and compressibility of friction materials. This standard applies to disc brake pad assemblies and its coupons or segments, brake shoe lining and its coupons or segments, and brake blocks segments used in road vehicles. This SAE test method is consistent in intent with the ISO 6310 and the JIS 4413.
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