displaying posts 1 to 17 of 17

Author Subject: Servo ruined?
heliosphan

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Location: UK

Registered: 14 Sep 2007

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Post #1
This relates to my father's 106 diesel but the principle is the same as a 6's set-up, I imagine.


The car is left overnight, like normal.

It's started in the morning to go to work and the brakes need a massive effort to stop the car. Same as a non servo assisted car: if anyone's ever driven an early Mini, with no servo & drums all around, you'll know what I mean.

This only happens for the first few hundred metres/less than a minute of driving. Afterwards, the brakes operate normally. I've tried the car and the brakes feel perfectly good (for a 106 of this type) so the servo must be working by this stage. Yet initially, they're awful.

Info:
Master cylinder is new.
Front pads are new.
Rear cylinders are new.
Rear shoes are new.
Fluid is new, twice. No air.
One caliper is new.

Questions:
Vacuum hose *seems* OK: not perished/cracked etc. Could it be just the seals?
Is it likely that the pump has failed? Remember that the car has normal-feeling brakes just 200 metres down the road...
Is it the servo that's losing air slowly while stood overnight, and taking a minute to build up it's vacuum after the car's just started?



After the initial bite has come back to the brakes, they work fine for the rest of the day: even after the car's been turned off. Even after a normal 8-odd hour stint in the office car park twiddling its thumbs/wheels, it's fine.

When sat overnight (more like 10 to 12 hours), all is not fine.


Cheers guys.

Posted 28th Sep 2012 at 12:35
woody.

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Location: London

Registered: 18 May 2009

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Post #2
Maybe you're just really tired in the morning and need to eat some shreddies?
Posted 28th Sep 2012 at 12:58
heliosphan

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Registered: 14 Sep 2007

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Post #3
Naturally, this was my first thought too.

Then I remembered I'm an ultra beef cake, so the idea was dismissed as quickly as it had arisen. Sad
Posted 28th Sep 2012 at 13:24
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #4
Seeing as the car is a diesel, it won't naturally have a vacuum in the inlet manifold. The manifold will be open to atmospheric pressure and therefore the servo operation is dependant on a vacuum pump.

On the '6' engine, there is a vacuum in the inlet manifold, which is also topped up by the use of a vacuum pump before it reaches the servo, whereas on a diesel powered vehicle this is different and the servo is relying solely on the pump to provide the vacuum. Check the vac pump is operating correctly would be my first port of call. Yes

You can also check the operation of the servo itself. When you get in the car first thing in the morning (when you know it will have a problem) put your foot down on the brake pedal and THEN start the engine. You should feel the pedal go down slightly more when the engine fires up. If it doesn't then the servo is knackered. Yes

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Posted 28th Sep 2012 at 14:00
mechanical_repairs

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Location: leicester

Registered: 10 Jan 2005

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Post #5
in the vacuum pipe work there is a one way valve that has been known to stick, for what they cost i would replace it, that would be my first port of action.

Carl

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Posted 28th Sep 2012 at 14:05
stan_306gti6 Forum Admin

Location: Kent

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Post #6
Have you found the issue to this yet? Dunno

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Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 6th Oct 2012 at 19:20
heliosphan

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Location: UK

Registered: 14 Sep 2007

Posts: 950

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Post #7
Not yet: the tubing and the check valve have been replaced to no effect. Next up is checking that the vacuum pump is creating enough suction by comparing to a known good unit. After that, it's new servo time I guess.

SB says £113.95. Hope GSF supply one...
Posted 8th Oct 2012 at 17:12
gilesy

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Location: Greenwich - in that London

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Post #8
woody. wrote:
Maybe you're just really tired in the morning and need to eat some shreddies?


+1 for that
Posted 8th Oct 2012 at 17:40
stan_306gti6 Forum Admin

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Post #9
You *should* be able to source one cheaper from a factors than Pug. Yes

GSF or ECP would be my starting point if you do indeed need to replace the unit. Wink

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 9th Oct 2012 at 15:31
dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

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Post #10
Or a decent used one perhaps.

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  • Posted 10th Oct 2012 at 13:16
    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

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    Post #11
    where did you find the £113 price? its £200 on my SB LOL


    edit, DERP! thats the vacuum pump, and no service kit listed.

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    need a part number? get on here - http://public.servicebox.peugeot.com

    Bring on the Trumpets.

    Posted 10th Oct 2012 at 13:29
    heliosphan

    Senior User

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    Post #12
    dangti6 wrote:
    Or a decent used one perhaps.


    Thought about that, but the eBay auction will state that it's in perfect working order and is gold plated and comes with a bag of diamonds and some hookers and some coke and an island in the Pacific and can grant you three wishes.

    But it isn't and it won't and it can't.
    Therefore, the saga will begin again after the inevitable demise of the 'mint' second hand servo.

    Probably best to buy a new one.
    Posted 10th Oct 2012 at 13:52
    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

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    Post #13
    For an item that rarely appears to fail, I'd personally take the chance on a servo for a few quid first.

    Funnily enough I could whip the one off the Xsara for you which I can send with a bag of council estate driveway diamonds and some Cola.

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  • Posted 10th Oct 2012 at 14:00
    heliosphan

    Senior User

    Location: UK

    Registered: 14 Sep 2007

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    Post #14
    Conclusion to this for reference.

    Prices for a new servo were all about the same so my dad plumped for a used one from eBay.
    It turned out to be the cause of the problem: brakes are now sharp right from the off. Hope the 2nd hand unit lasts...

    As a side, it gave us an opportunity to check the linkage bar adjustment in the engine bay, which certainly did need adjusting. I'll take a look at this linkage on the 6 at some point I think (assuming it has the same set-up).
    Posted 8th Nov 2012 at 16:41
    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

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    Post #15
    no, it doesn't lol

    ________________________________________

    need a part number? get on here - http://public.servicebox.peugeot.com

    Bring on the Trumpets.

    Posted 8th Nov 2012 at 16:58
    heliosphan

    Senior User

    Location: UK

    Registered: 14 Sep 2007

    Posts: 950

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    Post #16
    Oh.
    Bravo for French consistency.
    Posted 8th Nov 2012 at 17:09
    stan_306gti6 Forum Admin

    Location: Kent

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    Post #17
    Glad this is sorted now, hope the second hand unit lasts for a good while then. Thumbs up

    ________________________________________

    "Supercharged - 454.1bhp/317.5lb/ft"
    Peugeot 306 GTi-6
    2000 (X), Moonstone Love
    Posted 9th Nov 2012 at 12:01

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