new servo fitted but all is not well

[jonhall88]

I am a complete numpty, after fitting the new servo assembly I had a bit of a nightmare figuring out where the vacuum lines connected, all sorted now thanks to the tech section manuals, nice picky of vac tank and hoses. So next problem and I kind of figure this is down to the duel braking system I bled the front brakes no problem but absolutely nothing from the back I assume if the back brakes fail then there is a safety fallback so the front still work, but if the rear pipes are empty the car thinks they have failed so no joy with the vacuum pump and bleeding
any advice always appreciated
jon
ser 3

[mgcjag]

Hi Jon....long time since i blead S3 brakes...but thought it was the same as S2........may be wrong....anyway this may help viewtopic.php?f=3&t=6273 Steve

[MLBS3V12]

Hi I've found pictures from some v12 showing the brake hoses. Hope this will help:

This one show some of the holes


Detail of the air depress tank.

[MarekH]

Dear Jon,

You can make brake bleeding from a standing start easy by first using meths. It flows very easily, flushes the lines out and then the brake fluid flows without impediment.

If you almost empty the reservoir of meths, fill the bottom with red grease just before running out and then top up with normal dot4 brake fluid. When you see the red colour coming through at the calipers, you know the meths is flushed out and the brake fluid to rubber contacts are well lubricated to boot.

kind regards
Marek

[jonhall88]

Thanks for advice will give the red grease a go

[MarekH]

The red grease won't help with bleeding the brakes (unless you have somehow got the shuttle in the servo stuck). All it is doing is putting a marker in so you know the meths is flushed through. This is because a pale violet colour will not be visible when diluted by pale yellow, but a dose of deep crimson red will show up nicely.

kind regards
Marek