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.The 2000 Chevrolet Monte Carlo brake caliper bolt size is 9/16. The brake caliper bolt can be purchased at most auto-parts stores
What size alien wrench need to take off brake caliper 1996 Buick le sabra
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2006 lincoln navigator requires a 7mm hex to remove brake caliper
15 mm is the size,for caliper bolts caliper bracket bolt is t60(it is star shaped)
T-55
7mm
Torx #45
T-50
Take the caliper to a machine shop and have the broken bolt removed or just replace the caliper. If you do not understand the bolt sizing, you are not equipped to retap the caliper.
Well I know its not 3/8 tried T-55 T-50 T-60 none worked
A 3/8" Allen wrench will remove that bolt on the front caliper.