Technical Idle / servo issue Mk2a Sporting 2002

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Technical Idle / servo issue Mk2a Sporting 2002

sy666

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Hi all

New to the site and will be paying up membership at the end of the month as I find this is always money well spent. Have an issue with the new car. When starting in the morning, or even when hot the car idles around 800-900 which I assume to be correct but the minute I use the brakes then idle it shoots up to around 1400 and there is what sounds like an air leak from the servo area. I have tried the search and Google and don't seem to be able to find out any info. Would I be correct in assuming the servo could be leaking, checked the vacuum pipe and seems ok, when the brakes are applied with a little pressure the noise stops and revs return to normal idle. Is this a common issue or unrelated? Just wanted to check before replacing as cheapest I have found the part is £160 and looks like a pig of a job. Just don't want it to turn out to be a little pipe somewhere else after doing all the work!

Cheers in advance​
 
Sounds like the servo might be leaking. Do a few checks first.Run the motor, switch off and push the brake pedal a few times , does it rise and get harder to push? Keep the foot hard on the pedal and start up , does it sink?
Take off the vac hose to the servo at the servo end and block it up. Do you still have the revs going up? If not it would indicate servo.
 
Cheers,

Looks like the servo then, was hoping not as it looks like a b!tch of a job!
 
Cheers,

Looks like the servo then, was hoping not as it looks like a b!tch of a job!

have you followed to the letter what brendan said
ie are you sure its not a faulty vacuum pipe/one way valve issue rather than the chamber itself
 
If you blip the throttle and thrash the brakes (ie stamp really fast on them) the revs will remain up
As your demanding increased vacuum to maintain a good brake pedal feel

Anyway - yes see what happens when you pump the pedal engine off - it goes hard and v.little travel it means the servo retains pressure (neg or posi i cant remember)

but as yous tart the engine - the engine recompensates the imbalanced vacuum - and the pedal will sink back to how it should normally feel

if you feel nothing like this - go to a scrappier - try and Different Vacuum servo pipe thats in good nick

When i damaged mine the pedal was always alot softer then it should have been

new Pipe - improved it
New Cap for fluid = even better

Ziggy
 
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