Frequently Asked Questions (FAQs)

Why is a silencer spring necessary when resurfacing rotors?
Rotors are made of cast iron, which naturally resonates when a cutting tool is applied. This resonance creates "chatter"
How do I know if my silencer spring needs replacing?
If the spring has been over-stretched and no longer fits tightly around a standard rotor, or if you notice visible "gaps" between the coils when it is under tension, it
Where should the spring be placed on the rotor?
For the best results, place the spring around the outermost edge of the rotor. This is where the harmonic "ringing" is most intense. Ensure it is seated securely and not interfering with the path of the twin-cutter bits.
Does the brand of my brake lathe matter?
No. Silencer springs are universal accessories. Whether you are using an Ammco 4000, an Accuturn 8922, or a Hunter bench lathe, these springs are compatible as long as you are resurfacing standard passenger or light truck rotors.
What is the difference between these springs and rubber silencer bands
'-Springs: Generally more durable and better at handling the heat generated by heavy cuts. They provide a high amount of tension and are preferred for larger, heavier rotors. -Rubber Bands: Excellent for fine finishing passes on thinner rotors but can degrade over time due to oil and heat exposure. Many shops keep both on hand.

Rotor Silencer Spring Set | Anti-Chatter Tension Springs for AMMCO Brake Lathe Silencer Assemblies | Part #9800

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    $24.86 $38.48

    Replacement tension spring set for bench brake lathe silencer assemblies. These springs maintain consistent band tension against the rotor surface throughout the cut, preventing the band from loosening as the cutting force varies. Worn or stretched springs allow band slip, which introduces chatter and produces a ridged or directional finish on the resurfaced rotor. Standard wear part in scheduled silencer assembly maintenance.

    • Part #: 9800
    • Set contents: Replacement silencer band tension springs
    • Application: Maintains constant band tension during rotor resurfacing
    • Lathe compatibility: AMMCO and equivalent bench brake lathes using 9800-series silencer assemblies
    • Pairs with: Silencer bands (6921, 6922, 6920) and pressure pads (9183)
    • Function: Prevents band slip and chatter, ensures non-directional finish
    • Recommended replacement: When springs show visible stretch or assembly tension feels reduced
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    Description

    Replacement tension spring set for bench brake lathe silencer assemblies. These springs maintain consistent band tension against the rotor surface throughout the cut, preventing the band from loosening as the cutting force varies. Worn or stretched springs allow band slip, which introduces chatter and produces a ridged or directional finish on the resurfaced rotor. Standard wear part in scheduled silencer assembly maintenance.

    • Part #: 9800
    • Set contents: Replacement silencer band tension springs
    • Application: Maintains constant band tension during rotor resurfacing
    • Lathe compatibility: AMMCO and equivalent bench brake lathes using 9800-series silencer assemblies
    • Pairs with: Silencer bands (6921, 6922, 6920) and pressure pads (9183)
    • Function: Prevents band slip and chatter, ensures non-directional finish
    • Recommended replacement: When springs show visible stretch or assembly tension feels reduced

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    Frequently Asked Questions (FAQs)

    Why is a silencer spring necessary when resurfacing rotors?
    Rotors are made of cast iron, which naturally resonates when a cutting tool is applied. This resonance creates "chatter"
    How do I know if my silencer spring needs replacing?
    If the spring has been over-stretched and no longer fits tightly around a standard rotor, or if you notice visible "gaps" between the coils when it is under tension, it
    Where should the spring be placed on the rotor?
    For the best results, place the spring around the outermost edge of the rotor. This is where the harmonic "ringing" is most intense. Ensure it is seated securely and not interfering with the path of the twin-cutter bits.
    Does the brand of my brake lathe matter?
    No. Silencer springs are universal accessories. Whether you are using an Ammco 4000, an Accuturn 8922, or a Hunter bench lathe, these springs are compatible as long as you are resurfacing standard passenger or light truck rotors.
    What is the difference between these springs and rubber silencer bands
    '-Springs: Generally more durable and better at handling the heat generated by heavy cuts. They provide a high amount of tension and are preferred for larger, heavier rotors. -Rubber Bands: Excellent for fine finishing passes on thinner rotors but can degrade over time due to oil and heat exposure. Many shops keep both on hand.

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