I brake & the engine revs drop down...

[telboyofpeckham]

I'm sure it's a common problem But it's to the point that the engine cuts off at idling.

Faulty servo or a leak in the pipe?

 

[Happystamps]

Could be, or could be a mixture/fuel shut-off valve/timing/valves...

Let the bus run and spray some wd40 around the joins in your inlet manifold.... see if the revs increase.

 

[telboyofpeckham]

Thanks. I will try that.

 

[subheatadey]

Its to do with the brake servo and vacuum pressure I guess, check non-return valve is working and vacuum pipe is good.

 

[Supertramp]

Servo. Had the exact same problem. Block the pipe off at the servo end and see if that solves it.

 

[TakeLifeEasy]

This is interesting as I am just starting to see this problem on my van. What is interesting is that I have only just starting to get this happen since cleaning all the grease and waxoyl under the van that was covering all the pipes so I wonder if I have a leak that was being plugged buy all the crap!

 

[telboyofpeckham]

Just got my van back from Alan Hills Motors & he tells me that hoses are fine but the non return valve is missing.

Maybe that's the problem then :shock: