3 replies to this topic

[Swift_General]

Random question. Does anyone know what the boost ratio of the later (dual circuit) brake servo is? I know the mk3 single line was 1.9:1. Thanks.

[Ethel]

It'll be similar, 2.1 sticks in my mind, but that might be the Metro's. All other things being equal, the remote servo will lose a bit of force due to having the pushrod running through the hydraulics and reducing the piston area offered to the master cylinder. Like the brake intensifier on a 998 Cooper, but in reverse.

[Spider]

I seem to recall that the Cooper S Servos were 1.7:1. Given the dia of the diaphragm of the booster in question, it would likely be less than this figure.

Edited by Moke Spider, 15 June 2015 - 09:41 AM.

[Swift_General]

Okay thanks. Was considering going to the tamdem servo as part of a rebuild having previously had a remote and trying to work out likely effect given boost ratio, increased bose size etc.

Edited by Swift_General, 15 June 2015 - 02:08 PM.