1. Introducció i presentació del producteview
The Performance Tool W86021 4pc 3/8-Inch Drive Long Brake Caliper SAE Bit Set is designed for efficient and reliable brake caliper maintenance and repair. This versatile tool set includes four SAE sizes (1/4", 3/8", 5/16", and 7/32") to accommodate a variety of brake caliper bolts. Constructed from heat-treated alloy steel, these bits offer superior strength and durability. The long reach design, with an overall length of 4 inches, provides easy access to hard-to-reach brake caliper bolts, making it suitable for both DIY enthusiasts and professional mechanics.
The professional sand finish not only enhances the aesthetic appeal of the set but also contributes to its longevity.

Image 1.1: The Performance Tool W86021 4pc 3/8-Inch Drive Long Brake Caliper SAE Bit Set, showcasing the four different SAE size bits.
2. Informació de seguretat
Always prioritize safety when working with tools. Failure to follow these safety guidelines may result in injury or damage to property.
- Utilitzeu l'equip de protecció individual (EPI) adequat: Always wear safety glasses to protect your eyes from debris. Gloves are recommended to protect hands.
- Ensure proper vehicle support: When working on brake systems, ensure the vehicle is securely supported on jack stands on a level surface. Never rely solely on a jack.
- Feu servir l'eina adequada per a la feina: Select the appropriate size bit for the brake caliper bolt to prevent stripping the fastener or damaging the tool.
- Inspect tools before use: Before each use, check the bits for any signs of wear, cracks, or damage. Do not use damaged tools.
- Mantenir l'àrea de treball neta i ben il·luminada: A cluttered or poorly lit workspace increases the risk of accidents.
- Mantingueu allunyats els nens i els vianants: Ensure no unauthorized personnel are in the work area.
- Advertència de la proposta 65: Aquest producte us pot exposar a productes químics que l'estat de Califòrnia sap que causen càncer i defectes congènits o altres danys reproductius. Per a més informació, visiteu www.P65Warnings.ca.gov.
3. Contingut del paquet
En obrir el paquet, comproveu que tots els components hi són i que no estan danyats.
- 1 x Performance Tool W86021 4pc 3/8-Inch Drive Long Brake Caliper SAE Bit Set, including:
- 1 x 1/4-Inch SAE Brake Caliper Bit
- 1 x 3/8-Inch SAE Brake Caliper Bit
- 1 x 5/16-Inch SAE Brake Caliper Bit
- 1 x 7/32-Inch SAE Brake Caliper Bit

Image 3.1: The retail packaging for the Performance Tool W86021 Brake Caliper Hex Bit Set, clearly displaying the four bits included.
4. Configuració i preparació
Before using the brake caliper bit set, ensure your workspace and vehicle are properly prepared.
- Preparar el vehicle: Park the vehicle on a level, stable surface. Engage the parking brake.
- Aixecar i assegurar: Using a floor jack, carefully lift the vehicle at the designated jack points. Place sturdy jack stands under the vehicle's frame or designated support points to safely secure it. Never work under a vehicle supported only by a jack.
- Remove Wheel: Remove the lug nuts and carefully take off the wheel to access the brake caliper.
- Identify Caliper Bolts: Locate the brake caliper bolts that need to be removed or tightened. These are typically hex-head bolts.
- Seleccioneu el bit correcte: Choose the appropriate SAE size bit (1/4", 3/8", 5/16", or 7/32") from the set that precisely fits the brake caliper bolt. A snug fit is crucial to prevent stripping.
- Connectar a l'eina d'accionament: Insert the selected bit into a 3/8-inch drive ratchet, breaker bar, or torque wrench. Ensure the bit is fully seated and locked into place.

Imatge 4.1: Primer pla view of the four brake caliper bits, highlighting their 3/8-inch drive base and the hex bit tips, ready for attachment to a drive tool.
5. Instruccions de funcionament
Follow these steps for effective use of the brake caliper bit set.
- Removing Brake Caliper Bolts:
- With the correct bit attached to your 3/8-inch drive tool, position the bit firmly into the head of the brake caliper bolt.
- Apply steady, even pressure and turn counter-clockwise to loosen the bolt. For stubborn bolts, a breaker bar may be necessary.
- Once loosened, continue to turn until the bolt is fully removed.
- Installing/Tightening Brake Caliper Bolts:
- Ensure the threads of the brake caliper bolt and the caliper mounting bracket are clean and free of debris.
- Insert the bolt into its position and hand-tighten it as much as possible.
- Attach the correct bit to a 3/8-inch drive torque wrench.
- Position the bit firmly into the bolt head and tighten clockwise to the manufacturer's specified torque settings. Refer to your vehicle's service manual for exact torque specifications.
- Do not overtighten, as this can damage the bolt or the caliper assembly.
- Accessing Hard-to-Reach Areas: The long reach design of these bits (4-inch overall length) is specifically beneficial for accessing bolts in confined spaces or those that are recessed within the brake assembly. Utilize the extended length to maneuver around obstacles.
6. Manteniment i emmagatzematge
Proper maintenance and storage will extend the lifespan of your Performance Tool Brake Caliper Bit Set.
- Neteja: After each use, wipe down the bits with a clean cloth to remove any grease, dirt, or brake dust. A mild degreaser can be used if necessary.
- Assecat: Ensure the bits are completely dry before storage to prevent rust.
- Lubricació: A light coat of rust-preventative oil can be applied to the bits, especially if storing for extended periods in humid environments.
- Emmagatzematge: Store the bit set in its original packaging or a dedicated tool organizer in a dry, cool place, away from direct sunlight and corrosive chemicals.
- Inspecció: Periodically inspect the bits for any signs of wear, such as rounding of the hex corners, cracks, or corrosion. Replace any damaged bits immediately.
7. Solució De Problemes
This section addresses common issues you might encounter while using the brake caliper bit set.
| Problema | Causa possible | Solució |
|---|---|---|
| Bit slips or rounds off bolt head. | Incorrect bit size used; bolt head is stripped; excessive force applied at an angle. | Ensure the correct SAE size bit is selected for a snug fit. If the bolt head is already damaged, specialized bolt extractors may be required. Apply straight, even pressure. |
| Bit breaks or bends. | Excessive torque applied; bit is worn or defective; improper use (e.g., using with impact tools not rated for bits). | Do not exceed recommended torque specifications. Inspect bits for wear before use. These bits are designed for manual use with ratchets or torque wrenches, not typically for impact drivers unless specified. Replace broken bits. |
| Difficulty accessing bolt. | Obstructions around the bolt. | Utilize the long reach design of the bits. Ensure the drive tool (ratchet/wrench) is positioned correctly to allow for clearance. |
If you encounter issues not listed here or require further assistance, please contact Performance Tool customer support.
8. Especificacions
Detailed technical specifications for the Performance Tool W86021 Brake Caliper Bit Set.
- Marca: Eina de rendiment
- Model: W86021
- Nombre de peces: 4
- Mida de la unitat: 3/8 polzada
- Bit Sizes (SAE): 1/4-Inch, 3/8-Inch, 5/16-Inch, 7/32-Inch
- Longitud total: 4 Inches (each bit)
- Material: Heat-treated Alloy Steel
- Tipus d'acabat: Sand Finish (Polished)
- Pes de l'article: Aproximadament 8.8 unces
- País d'origen: Taiwan
- UPC: 039564860218
9. Garantia i Suport
Performance Tool products are manufactured to high standards. For warranty information and customer support, please refer to the official Performance Tool weblloc web o contacteu directament amb el seu departament d'atenció al client.
Wilmar, LLC, the parent company of Performance Tool, was founded in 1971 and is a leading distributor of professional tools in North America. They are committed to providing quality tools and great service.
- Fabricant: WIOGW (Wilmar, LLC)
- Botiga de marca: Performance Tool Amazon Store
- For specific warranty details, please visit the manufacturer's official weblloc o poseu-vos en contacte amb el seu servei d'atenció al client.





