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        General >> Problems >> clunk from brake servo
        
(Message started by: pedropedro on May 20^th, 2010, 6:31pm)

Title: clunk from brake servo
Post by pedropedro on May 20^th, 2010, 6:31pm

I would appreciate some advice as I have along trip tomorrow and am concerned about a clunk from the servo that developed today

when stationary no sound, press brakes when moving every time a clunk from what seems to be the servo/solenoid area ie behind steering wheel area

obviously hard to identify as only happens when moving...any ideas.......??? just concerned re brakes

Title: Re: clunk from brake servo
Post by pedropedro on May 20^th, 2010, 8:35pm

it is hard to identify but doesnt do in reverse so maybe its from front brake somewhere ...just sounds like from centre but hard to pinpoint...ah well suppose its ok just a worrying noise ....

Title: Re: clunk from brake servo
Post by gozz on May 20^th, 2010, 11:04pm

If one of the rear wishbone bushes is excessively worn,braking causes sideways movement and could clunk,though I imagine you will have checked that.
GOZZ.

Title: Re: clunk from brake servo
Post by pedropedro on May 21^st, 2010, 5:22pm

yes had those checked and replaced recently,,,,,the noise this a.m. had gone, but appeared after 30 miles or so driving
its a distinct click/clunk almost exactly where brake servo is

is there anything in the servo, say master cylinder that could do this?

john

Title: Re: clunk from brake servo
Post by PJDavis on May 21^st, 2010, 6:16pm

It maybe worth checking the vacuum to the servo from the manifold. I wonder if the diaphragm has started to perish slightly, this can be due to petrol getting down the vacuum pipe through a one-way valve. Now I'm not sure if Scorpio has a one-way valve or even if the vacuum comes from the manifold. I had a similar problem with my Zodiac last year, the diaphragm was perished and this was causing the spring to 'clunk' back into place after the brakes were released, cause was the vacuum pipe one way valve allowing petrol down the pipe. Just take the pipe off the servo an snuffed it! There will be a slight whiff of petrol, but it won't be damp and really reeking.

Peter.

Title: Re: clunk from brake servo
Post by Tompion on May 21^st, 2010, 9:01pm

I had planned to run OBD on my car over the weekend to see what readings I get (with regard your other post about the MAF/gearbox flare). One of the things I was going to do was introduce an unmetered air leak at the manifold to see what effect it had.

If it turns out an air leak is making this clunk the 2 problems may be related.

Title: Re: clunk from brake servo
Post by pedropedro on May 21^st, 2010, 10:58pm

i appreciate the interest ....I await your findings......
I have obd sware as well so can follow your results

john