I don't have a problem with my brakes I was just wondering how the rear brakes work on the s type, i understand the pistons need "winding in" when you replace the pads. so are they threaded or does the winding do something else like release the pressure or something ? if they need winding in how do the pistons move in and out when you brake ?

Does anyone have exploded diagram of the caliper and pistons ?

Thanks

 

I think they wind in on a screw but come out with a sort of spring-loaded ratchet. I've seen (similar, may not have been the actual jag ones but then jag won't make them) pictures on the net, may be on howstuffworks.

 

ok, that would work, does anyone know why the rears are different to the front ?

 

The rears do double duty as parking/emergency brakes. Doing so hydraulically would be a nightmare, so a mechanical set up is used. The ratchet/threaded stuff is required exclusively for that function, nothing to do with the normal service brake. The typeRs have a separate caliper just for the e-brake I beleive.

 

The ratchet type caliper which incorporates the parking brake is also used on Ford vehicles. There are kits sold that are used to crank in the piston. It can be done with a pair of vicegrips and a bic C clamp (also a bit awkward) but you risk damaging the rubber dirt boot.

 

ok, i see why now,

Thanks