On 9/13/2018 4:16 PM, Brian Kemp wrote:
> I'm told it is how the parking brake adjusts itself when the pads get
> worn. The parking brake lever pulls a cable which actuates the rear
> brake calipers. Discovered the special tool after battling the rear
> brakes on my wife's Jetta. I borrowed the special tool from the local
> O'Reilly or Pep Boys.
You have three basic approaches out there for a parking brake with rear
discs. One (common in higher-end German products, trucks, and a few
others) is to put a drum in the hat of the rear rotor.
One (found generally on high-end products - Italian exotics, high-end
Jags, Tesla Model S/X) and some aftermarket kits) is a separate
mechanically-actuated parking-brake caliper.
The third and by far most common is to put a screw-jack mechanism inside
the rear caliper piston.
This is where the retraction tool comes in, and yeah, it's a PITA that
they're all different.