Forum Member
Posted 05 September 2021 - 07:39 PM
Hey Fellas,
I am upgrading from the old rusted Girlock cast iron front calipers on my 78 UC to PBR alloy calipers, When I bolt the PBR alloy calipers on loose, they slide back and forward fine but when I tighten the caliper bolts, the caliper seizes on the slides.
It seems like the bolt holes are not perfectly aligned or are drilled on a slight angle.
Has anyone here encountered this problem?
I stuffed about with it for hours and I'm out of ideas to solve it.
Lotsa Posts!
Posted 05 September 2021 - 08:00 PM
Forum Member
Posted 05 September 2021 - 08:49 PM
Chuck them and go back to cast calipers, two pistons work better.
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I can't mate, they don't fit over my HQ calipers
Scrivet Counter
Posted 05 September 2021 - 10:03 PM
I can't mate, they don't fit over my HQ calipers
You mean HQ rotors? original diameter on HQ stubs or machined down to 256mm fitted on UC stubs?
Edited by S pack, 05 September 2021 - 10:05 PM.
Do I feel lucky? Well, do ya, punk?
Posted 06 September 2021 - 08:29 AM
Forum Fixture
Posted 06 September 2021 - 04:21 PM
HX PBR calipers ? if they are they will not fit a 256mm disc
Forum Member
Posted 06 September 2021 - 05:15 PM
Sorry Fellas,
HQ Rotors, turned down 6mm on radius.
Torana alloy PBR calipers with HX Holden cast iron slides
Forum Fixture
Posted 06 September 2021 - 06:32 PM
there's your problem , throw away the rotors and try something different . That mod is crap
Forum Member
Posted 06 September 2021 - 07:09 PM
Honestly, I tried to upload pics but gave up because I am not hosting pics anywhere. I also searched the site for an explanation how to easily add pics but didn't get any hits.
I actually solved this. When you tighten the fastener to secure one of the the caliper slider tubes to the stub axle, the tube is not perpendicular to the mounting face. Both slider tubes must be perpendicular, if not, the caliper will jamb.
I stuck a 10 Thou feeler gauge between the stub axle and the caliper slider tube, then I tightened the caliper fastener. This straightened up the slider tube and the caliper now slides freely.
Not sure how I can fix this long term.
To advertise here, call 13TORANA
Posted 06 September 2021 - 10:32 PM
With a shim
Lotsa Posts!
Posted 06 September 2021 - 10:57 PM
Forum Member
Posted 20 September 2021 - 01:10 PM
I made a shim with angle faced surface, cheers fellas
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