How far to brake pistons travel?
Posted: Sat Apr 02, 2016 12:51 am
I have some old Endless 6 piston calipers I'm looking to set up on my project.
I disassembled them to work out how I'd need to adapt them to fit the rotors going onto the car and this is where I'm confused. As they arrived, all 8 calipers had the pistons protruding 8mm from the caliper. This was I thought as much as they would retract.
After popping a set of pistons out I found that their recess into the caliper is actually exactly as deep as the total height of the pistons themselves. So I'm wondering how much space I need to allow below the piston for the fluid to travel as this obviously dictates where the piston will sit and as such the brake pad and then how much I have to space apart each side of the caliper to fit around the wide rotors. It will also make mounting the calipers less painful as there are issues clearing the wheel face too.
This is a basic profile of the piston recess in the calipers. 27mm deep in total with the fluid feed at the bottom (obviously). At the base of the recess is a 4mm tall section that is cut with a slightly wider bore. Can I assume that up to this point is where I should allow the pistons to travel to and any further could cut off fluid flow?
The only reason I can see to allow 8mm as they were is a larger cushion of fluid allowing for more of a heat sink?
Let me know if I'm on the right track.
Cheers.
I disassembled them to work out how I'd need to adapt them to fit the rotors going onto the car and this is where I'm confused. As they arrived, all 8 calipers had the pistons protruding 8mm from the caliper. This was I thought as much as they would retract.
After popping a set of pistons out I found that their recess into the caliper is actually exactly as deep as the total height of the pistons themselves. So I'm wondering how much space I need to allow below the piston for the fluid to travel as this obviously dictates where the piston will sit and as such the brake pad and then how much I have to space apart each side of the caliper to fit around the wide rotors. It will also make mounting the calipers less painful as there are issues clearing the wheel face too.
This is a basic profile of the piston recess in the calipers. 27mm deep in total with the fluid feed at the bottom (obviously). At the base of the recess is a 4mm tall section that is cut with a slightly wider bore. Can I assume that up to this point is where I should allow the pistons to travel to and any further could cut off fluid flow?
The only reason I can see to allow 8mm as they were is a larger cushion of fluid allowing for more of a heat sink?
Let me know if I'm on the right track.
Cheers.