Be Careful Not to Overtighten Bolts on an Aluminum Brake Caliper
Be Careful to Not Overtighten Bolts on an Aluminum Brake Caliper
Aluminum calipers function just like their iron counterparts; however, they are lighter and softer.
Softer, meaning the metal itself is more malleable than steel or iron. As a result, the threaded fitting ends on aluminum calipers require significantly less torque than a comparable iron caliper.
Check your vehicle manufacturers recommended torque specifications on all fasteners prior to tightening them and use a torque wrench where applicable.
The banjo bolts that secure the brake line to the caliper are usually made of stainless steel, a very hard metal. When threading steel bolts into an aluminum caliper, be extra careful to avoid cross-threading them. Check bolt threads prior to assembly, they should be clean with true threads. The same precautions should be taken when threading new bleeder screws in as well. Remember: Aluminum threads are very soft and require far less torque, than an iron caliper, to secure.
You may need to clean old thread-locker compound and/or oxidation off the old caliper to bracket bolts prior to reassembly. Clean threads prevent galling and ensure that proper torque is achieved during installation. If your caliper bolt threads need cleaning, use parts cleaner and a brass wire brush.
Aluminum caliper housings are more sensitive to over torquing than iron calipers. Be sure to double check the recommended torque specifications for your application prior to tightening the caliper bolts. Use a torque wrench and the recommended thread.
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