I changed the brakes on a 1997 Holden Barina SB today (21/5/11). You will need a 10mm Allen key to take off the brake housing. Do yourself a favour and buy a set of Allen key type attachments for a ratchet. Makes it much easier.
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a hex bolt is bolt having six face head operated by spanner. an allen bolt is bolt having a six face groove in the head and operated by a special type of L shape key called allen key.
Torx or Allen wrenches get more torque (pressure) on the bolt.
8mm
Type and year of car would help.
1. A shaft diameter 2. Length of bolt 3. Inside of a hub