Brake servo problems

[frenchypilot]

Brake servo problems with Fiat Ducato TD based engines. There is supposed to be a upgrade to stop pressure loss in the servo system. Anyone know what it is.

 

[pappajohn]

what do you mean by 'pressure loss' ?

the servo is vacuum operated and as long as the engine is running you will have vacuum, provided the vacuum pump is working and the servo diaphragm isnt split....in which case replacement of both is the only answer.

vacuum will drop to nothing eventually until the engine is restarted.

 

[frenchypilot]

On the earlier Ducato engines the servo power is shared with steering , when the steering is used a lot ie parking etc there is not enough vaccum pressure to the brake servo. There is supposed to be an electrical vacuum booster pump of some sorts available. I just wondered if anyome knew about this. Campervan going in to have problem rectified next week but would like to know if anyone on MHF has had similar problem.

 

[pappajohn]

My apologies......didnt realise this was the case and never heard of it before.

to my mind all power steering is either hydraulic or electric and brake servo is air vacuum.

 

[jhorsf]

I have heard these people are good may be worth a phonecall or email

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[dave newell]

PJ is correct, power steering is done by hydraulics on the Ducatos of all vintages and brake servo is vacuum. The only common thing to both systems is they are engine driven.

D.

 

[treetops1]

thanks for that bit of info ,i was unaware that was the case

 

[aba]

servo's occasionally have a 1 way valve fitted somewhere in the vacuum pipe between the pump.
this is more common on petrol engines as they don't usually have vacuum pumps but i have seen some on diesel engines.

most likely cause after split pipe or servo diaphragm would be an oil leak inside the pump and maybe oil being sucked back into the servo when the engine isn't running.

 

[pappajohn]

servo's occasionally have a 1 way valve fitted somewhere in the vacuum pipe between the pump.
this is more common on petrol engines as they don't usually have vacuum pumps but i have seen some on diesel engines.

most likely cause after split pipe or servo diaphragm would be an oil leak inside the pump and maybe oil being sucked back into the servo when the engine isn't running

always a possibility.
i used to drive a transit with the same problem......ever couple of weeks had to remove the servo and drain the oil out as it really did reduce servo power.

eventually i drilled a hole on the bottom and screwed in a self tapper to act as a drain bung.