The size of the bolt used for a brake caliper depends on the specific vehicle make, model, and year. Brake caliper bolts (also known as caliper mounting bolts or slider bolts) are not universal, and different manufacturers use different sizes and thread pitches.
However, there are some common sizes you may encounter:
Common Brake Caliper Bolt Sizes:
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Metric Sizes:
- M8 x 1.25 : Common in smaller vehicles or older models.
- M10 x 1.25 or M10 x 1.5 : Frequently used in many modern cars and trucks.
- M12 x 1.25 or M12 x 1.5 : Often found in larger vehicles like SUVs and trucks.
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Length:
- The length of the bolts can vary depending on the design of the caliper bracket and the thickness of the brake rotor. Typical lengths range from 20mm to 60mm , but this can differ significantly between vehicles.
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Thread Pitch:
- Thread pitch refers to the distance between threads. For metric bolts, this is measured in millimeters. Common thread pitches include 1.0 , 1.25 , and 1.5 .
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Head Size (Wrench Size):
- The head of the bolt typically requires a wrench or socket to tighten or loosen it. Common wrench sizes for brake caliper bolts include 14mm , 17mm , and 19mm .
Steps to Determine the Correct Bolt Size:
If you’re unsure about the exact size of the bolt for your brake caliper, follow these steps:
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Consult the Vehicle Manual:
- Check the service manual or repair guide for your specific vehicle. It will provide detailed specifications for the brake system, including bolt sizes.
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Inspect the Existing Bolt:
- If you’re replacing the bolt, measure the diameter, thread pitch, and length of the existing bolt using a caliper and thread gauge.
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Check Online Parts Catalogs:
- Websites like RockAuto, AutoZone, or OEM parts suppliers often list the exact specifications for brake caliper bolts based on your vehicle’s VIN or model details.
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Ask a Professional:
- If you’re still unsure, consult with a mechanic or parts specialist at an auto parts store.
Read More: How to Remove brake caliper without losing fluid.
Credit: www.reddit.com
Important Notes:
- Torque Specifications: Always torque the brake caliper bolts to the manufacturer’s recommended specification. Over-tightening can damage the threads or cause the bolt to break, while under-tightening can lead to unsafe operation.
- Use High-Quality Bolts: Brake caliper bolts endure significant stress and heat. Use only high-grade bolts (e.g., Grade 8 or equivalent) designed for automotive braking systems.
- Anti-Seize Compound: Applying a small amount of anti-seize compound to the threads can prevent corrosion and make future removal easier.
Final Answer:
The most common brake caliper bolt sizes are M8 x 1.25 , M10 x 1.25 , and M12 x 1.25 , with lengths ranging from 20mm to 60mm . However, the exact size depends on your vehicle’s make, model, and year. Always verify the correct size using the vehicle’s service manual or a trusted parts catalog.
If you provide your vehicle’s details, I can help narrow down the exact size for you!