Rear Brake Pad Dimple Thingy
Discussion
Does anyone here know what the small round 'dimple' thing on the back of some rear brake pads is actually for?
It locates into the caliper piston, of course, but why?
In this photo, the top pads are after market without the 'dimple' and the pads at the bottom are o.e. with the 'dimple'.
I'm guessing it can't be too important that it isn't there but I'm curious now as to what the dimple does.
It locates into the caliper piston, of course, but why?
In this photo, the top pads are after market without the 'dimple' and the pads at the bottom are o.e. with the 'dimple'.
I'm guessing it can't be too important that it isn't there but I'm curious now as to what the dimple does.
Edited by Martin350 on Thursday 2nd March 15:53
As said it prevents the piston from rotating and backing off the handbrake mech, see the pic below, the piston "might" turn and screw itself back down the thread of the parking brake thrust screw, result is usually a slightly long pedal that comes up if you quickly lift off and re apply the brakes/steering wandering under heavy braking/high handbrake lever/crapper than usuall handbrake effort, pretty much the same as a drum with poorly adjusted shoes.
Martin350 said:
I'm guessing it can't be too important that it isn't there but I'm curious now as to what the dimple does.
No, what it means is that the aftermarket manufacturer has missed a feature which the OE manufacturer considered necessary.By the way, the correct term is spigot!
Dave Brand said:
No, what it means is that the aftermarket manufacturer has missed a feature which the OE manufacturer considered necessary.
This is most definitely an important feature for pads fitted to handbrake calipers. The entire design of the caliper depends on the piston not rotating during normal use, so those pads should be going straight back to whoever sold them to the OP.Gassing Station | Suspension, Brakes & Tyres | Top of Page | What's New | My Stuff