JohnH Posted June 13, 2021 Report Share Posted June 13, 2021 Please would someone let me know what diameter the caliper mounting bolts are? I forgot to check while the car was up on stands and need to make up some shims to get them centralised better. Many thanks Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 13, 2021 Report Share Posted June 13, 2021 (edited) There are two sizes of bolt shank diameter. Both have the same sized thread. Which bolts do you have? 7/16" early - the caliper with the imperial threaded hydraulic fittings. - Girling Type 16P or PB to (c) CP76094/CC81078 (Imperial) - note has 1/4" diameter pad pins. 1/2" late - the caliper with the metric threaded hydraulic fittings - Girling Type M16P from (c) CP76095/CC81079 (Metric) - note has 3/16" diameter pad pins. Peter W Edited June 13, 2021 by BlueTR3A-5EKT Quote Link to post Share on other sites
JohnH Posted June 13, 2021 Author Report Share Posted June 13, 2021 It's an early CR but the calipers, which look to be recently refurbished, appear to be Imperial, as the pad retaining pins are 1/4". Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 13, 2021 Report Share Posted June 13, 2021 You will need to measure the mounting bolt holes in the caliper and get the correct tolerance fitting bolts. Fit the bolts to the caliper - if they are a snug fit that is right, if loose or will not go in the bolts are wrong for the calipers you have. The shims are usually not required unless the disc is offset, or the hub or caliper bracket are incorrectly mounted. Just be sure the disc when rotating runs in the space provided and does not touch the fitted caliper. The pads self align and self adjust. Peter W Quote Link to post Share on other sites
tr graham Posted June 13, 2021 Report Share Posted June 13, 2021 Later 6 have a different calliper & mounting and I believe are metric thread. Quote Link to post Share on other sites
CK's TR6 Posted June 14, 2021 Report Share Posted June 14, 2021 From the Buckeye Triumph website ”Metric Calipers: The next change, at commission number CC81079 (end of '72) was to convert the calipers to metric. The caliper type was not changed at this time, it stayed 16 BP. I pulled the caliper off the suspension from a '73TR6 I junked a while back. That car was purchased in the early '80s and I'm pretty sure the brakes are original as there were no indications that the car had had any prior maintenance. This caliper has TYPE 16BP cast into the side, as would be expected. The bolts that attach the calipers are clearly different as shown in photos the right. The bolt for the early standard thread type caliper is on the left and the one for the metric caliper is on the right. The actual threads on the end of both bolts are the same to match the caliper mounting plate that wasn't changed. The head of the metric version is 3/4 inch ~ 19 mm. The body of the bolt for the metric caliper is larger diameter matching the larger diameter holes in the calipers. You won't find one of those bolts at the neighborhood hardware store.” Quote Link to post Share on other sites
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