I'll have a look at the non return valve but there are some other problems now.
My "Dollopy" is on the take again - it has rarely given much back to be honest. So the failing servo unit aside, I was driving up the hill to get home this morning after having just nipped to the shops, when the accelerator cable snapped! I managed to coax the car up to the left hand turning of my road using the choke to get some more revs/power but the hill gets even steeper there and it could not make it. Lots of backed up traffic and annoyed looking road users. All I could do was give an apologetic smile
.
Unfortunately I had no tools in the car so I had to use the door key to screw down the idle screws on the carbs, that gave me enough guts from the engine to get up the hill and home - not nice driving along with a tick-over of 3500 rpm and no right pedal.
So it is time for it to come off the road again, as now it will not go and it will not stop properly either as the brake assist from the servo is beginning to be reduced.
It is such a pain sometimes, I had replaced the steering knuckle and had the wheel alignment set yesterday, the car was running quite sweetly, then whack! 3 miles of nice driving and the car does its thing!