Delay in brakes releasing

[Trog]

Check the clearance between the master cylinder and the rod, same type of thing happened to me when I fitted marina brakes, opening the clearance to about an inch solved it, worth a look.

[Mog-nuts]

I've got exactly the same problem with my Traveller.It has standard brakes with a servo.

Yesterday i removed and checked the one way valve that is situated in the vacuum pipe

between the servo and manifold. To say the least it seemed to be sticking so i replaced the pipe

minus the valve and gave it a short run. The problem had gone and the brakes actually felt better.

My question is; What is the purpose of the one way valve when it doesn't seem necessary?

Am i missing something? Many thanks for your comments

[bmcecosse]

May be to stop petrol being pushed into the servo in the event of an 'overpressure' (ie backfire) in the inlet manifold.

[Alex'n'Ane]

With response to the original poster, try 'bleeding' the servo outlet, and might aswell the inlet too whilst your at it, has solved the issue I had with the servo sticking on initially.

[katy]

Without the check valve, if the engine dies, you lose ALL vacuum in the servo. With the check valve, if the engine dies, you have a small reservoir of vacuum in the servo, enough for one or two brake applications before you have to really stand on the brakes to make them operate.