A 10/77 HZ will have the alloy PBRs, the Girlock alloys didn't eventuate until mid/late 1978.
There are basically 5 different front caliper types for HQ to WB, which become 7 when you get down to the finer points.
Firstly Girling & Lockheed merged around 1970 to become Girlock, so you shouldn't be seeing any Lockheed branded stuff on HQ-WB. You do see Girling branding on HD/HR calipers, HK & some HT/G. AFAIK the only Holdens to use Lockheed stuff was HB-TA 4-cyl Toranas.
The various caliper types are as follows:-
1. Cast Iron PBR: (2 types virtually interchangeable) Kidney shaped pads, a bit heavy but very reliable long term, good choice of pad materials & good brakes.
2. Cast Iron Girlock, largest pads, very heavy (heaviest of all) choice of pad materials limited, reliable long term & good brakes.
3. Alloy PBR (2 types), smallest pad area, limited pad choice, unreliable sliders, noisy & sticky unless lubed regularly.
4. Girlock alloy (HZ Collette), good braking, reliable, lightest of all, limited pad choice.
5. Girlock alloy (WB Collette) same comments as HZ Girlock.
Dr Terry
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