156 rear caliper guide pins - Alfa Romeo Forum
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156 rear caliper guide pins

Hmmm. I need some new guide pins as 3 of my 4 have been cross-threaded by the last bugger to work on my rear brakes. As a result you can't do the bolts up tight enough to stop the caliper from wobbling a bit - result along with the lower pins seizing has been uneven wear on pads and lots of squealing.

However all the pins on ebay are 75mm x 8mm diameter, same top and bottom.

Mine are 75mm x 10mm top, 65mm x 10mm bottom, with the bottom ones having a little rubber sleeve at the end. The only matching ones on ebay are advertised as being for a 147:

http://www.ebay.co.uk/itm/231707147916

...but they look about right to me. There's no way mine are 75x8! Did later 156s use the same rear caliper bracket as the 147? The part numbers aren't the same in EPER...
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If you go to their own website they list the same parts under the 156 models. Could be the difference in giude pins is related to the 2 different discs used on the rear, 156's used a 251mm disc and a 276mm disc on later models.

Looks like the larger diam pins are for the cars with 251mm rear discs.

I've used this company many times for a range of cars and can recommend them

Brake Parts | BrakeParts.co.uk
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I've definitely got 276mm discs...
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Solved by ordering 2nd hand bits from Autolusso... seems an odd situation though!
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The 156 JTS uses 276mm discs and don't use the same caliper as the 156 that have 251mm discs so that is probably the reason for the difference
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I did notice the pad doesn't cover the whole disc diameter - there's a good third that is unswept. Seems a bit pointless to have a disc larger than the pad coverage?
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Quote:
Originally Posted by ExBrick View Post
I did notice the pad doesn't cover the whole disc diameter - there's a good third that is unswept. Seems a bit pointless to have a disc larger than the pad coverage?
As long as the pad presses against the outer 2/3 - you get the best brake force for the pressure applied. The inner 1/3 of the solid disc will help dissipate the heat before the heat gets to the bearing.
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Makes sense, cheers.

Still waiting as I've been sent the wrong pins... unhappy bunny
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Got the correct ones the next day - all solved.
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