30 replies to this topic

[Dr Terry]

Hi Guys.

This HK/HT/HG disc rotor thickness query pops up often.

CHOPPER said "HK V8 & all HG discs are around 3 MM thicker than other HK & HT discs."

Not quite correct. ALL HK rotors are only 1/2" thick, ALL HT (except GTS 350) are also only 1/2" thick, but HT GTS 350 & ALL HG including 6 cyl, are 5/8" thick. The later calipers use the same castings as the early ones but have 2 x 1/8" spacers in between the 2 halves. They also have a 1/16" spacer at the caliper mount to give it the correct offset. The spacers in between the 2 halves are difficult to see & the mount spacer is often lost, you do see many cars with this missing.

Dr Terry.

[TerrA LX]

thanx Dr T, so with that do 13 inch wheels fit any or all of the HKTG brakes, with or without spacers?

[LC69GTR]

Thanks Dr Terry thats cleared up a few things

[Dr Terry]

Hi ALX76.

No, 13" wheels will not fit over HK/HT/HG disc brakes, but they will fit over the larger, 10" HK/HT/HG drum brakes. Also the spacers are not there for wheel clearance, they are there so that the narrow caliper fits over the thicker disc & still allows new pads to be fitted.

Dr Terry.

[LC69GTR]

Thanks LoneOranger when i have some time i will pull it down as have a good look