View Full Version : HD/HR Holden Callipers
31-05-03, 06:52 AM
I was just wondering why did Holden bring out twin piston callipers on their first disc brake car yet changed back to single piston callipers right up till the VT???
31-05-03, 05:18 PM
Because at the time Girling only had that type of caliper available.
They then changed to Girlock with the HK
When the HQ came along the single piston collett design was the latest thing from PBR so Holden went for it.
Even now the 2 piston PBR is still a collett design not like the old opposing design of the HR.
Collett calipers are cheaper to produce too.
31-05-03, 09:27 PM
Which design is better?
01-06-03, 08:12 PM
Opposing piston is the best for performance use. Higher clamping forces and larger pads are the main advantages.
Good quality units are the key.....most american calipers are shite mass produced garbage that flexes and requires almost unobtanable parts or at huge repair prices despite the cheap buying cost of the caliper.
Europeans are way ahead in caliper design. Brembo, AP,Alcon to name a few.
Ask yourself what caliper Porsche,Ferrari,Lambourghini,TVR use. They don't use them because they are expensive. But because they work.
Ever seen a Willwood or Outlaw caliper factory fitted to a production car ?
On a side note before anyone remarks on a particular Aussie made caliper. AP 6 spot HSV front caliper as used on GTS is cheaper than 4 spot Ha***p caliper used on previous premium system.
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