The current investigation was undertaken to find out if lighter-weight passenger car disc pads would exhibit wear behaviors similar to pickup truck pads and commercial heavy truck drum linings in terms of the permanent volume expansion of the friction material contact surface region. 2 high-copper NonAsbestos Organic formulations and 3 copper-free LowMet formulations were tested according to the SAE J2522 test procedure. In all cases, the measured pad thickness loss was found to be less than the thickness loss calculated from the weight loss, indicating pad volume expansion in the pad surface region, in full agreement with the results from the pickup truck and heavy trucks. The heataffected swollen/expanded layer ranges from 0.27 to 0.61 mm in thickness depending on the formula and test conditions. Due to the expansion, pad durability projections made from test results based on high temperature city traffic tests can result in underestimating the actual durability. Also, one needs to consider pad property changes associated with the volume expansion if good correlations are to be found between pad properties and brake friction, wear and NVH.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Divergence of Thickness Losses and Weight Losses of Disc Pads for Passenger Cars: High-Copper NAOs and Copper-Free Low Mets


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Brake Colloquium & Exhibition - 39th Annual ; 2021



    Publication date :

    2021-10-11




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Divergence of Thickness Losses and Weight Losses of Disc Pads for Passenger Cars: High-Copper NAOs and Copper-Free Low Mets

    Rathee, Aman / Singh, Shiv Raj / Sharma, Devendra et al. | British Library Conference Proceedings | 2021


    Brake Squeal and Wheel Dust vs. Disc Wear: No-Copper, Low-Copper and High-Copper NAOs

    Kaewlob, Kritsana / Sriwiboon, Meechai / Tiempan, Nipon et al. | SAE Technical Papers | 2015


    Brake Squeal and Wheel Dust vs. Disc Wear: No-Copper, Low-Copper and High-Copper NAOs

    Sriwiboon, Meechai / Tiempan, Nipon / Kaewlob, Kritsana et al. | British Library Conference Proceedings | 2015


    Mechanical Performance Losses in Automatic Transmissions for Passenger Cars

    Pickard, J. | British Library Online Contents | 1994


    Piston pads cut friction losses

    AE Group,GB | Automotive engineering | 1982