Engine revs dropping when braking

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vac leak wont be too obvious if it is indeed the issue.

the vac on these is supplied by a pump rather than manifold vacuum and I don't think the vac has any further input to the engine side of anything on the HDi.. will likely be corrected if I am wrong however.


Try this:  When rolling on a CLEAR empty piece of road,  get up to 30mph and then depress the clutch and immediately release the throttle pedal and idle..  

if the revs die down below you know its not a braking issue but an issue when you release the engine to an unloaded idle state and that would point to another area..  TPS, MAF sensor etc

There is a clutch switch on these,  it sits just at the top of the clutch pedal and is only clipped in gently.. the switch should be closed when the clutch is released and open when you depress the clutch. Might be worth a check.

do the revs drop below "normal" (about 900) and present the symptoms you described above?

are there any loose connections or wires around that could (under braking) be moved forming a worse connection ?

Have you had any work done on the MAF sensor recently?

Hi

I tried this the revs stayed as they should.