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Difference of brake servos mk5

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Difference of brake servos mk5

Postby Mac1984 » Sat Jun 02, 2018 8:00 pm

Hi guys,

I have a question regarding the brake servos on the mk5.

Mine has 2 openings, one I believe is the check valve, the other one has some electric connector coming out.

Can somebody advice what that is? I guess something to do with abs?, which my smiley has.

If it's not abs, can they be interchanged with the normal one as my servos leaking.
Or will a later servo fit, e.g Mk6?

Thanks for your reply
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Re: Difference of brake servos mk5

Postby ceurieusneus » Sun Jun 03, 2018 10:42 am

What is he leaking?
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Re: Difference of brake servos mk5

Postby vanfox » Sun Jun 03, 2018 11:28 am

There's ABS on my van, no wire from the servo. Post a pic using upload attachment.
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Re: Difference of brake servos mk5

Postby dumper » Sun Jun 03, 2018 3:08 pm

If you are leaking brake fluid it’s will be the master cylinder the servo is a vacuum unit if it leaks you lose efficiency and have to brake harder to stop the van
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Re: Difference of brake servos mk5

Postby Mac1984 » Sun Jun 03, 2018 6:19 pm

Yes vacuum leak, the brake effort is high. But the pedal is not hard or spongy, I have checked vacuum pump, it's all good.

It breaks normal, just feels like an old car without servo brakes, more effort required. I load up a picture asap.
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Re: Difference of brake servos mk5

Postby Mac1984 » Sun Jun 03, 2018 10:08 pm

This is the Servo from the Front, I have marked the two connections there with red. What is the one on the right???


centre.jpg


close up..is it some kind of pressure switch or something? I cant figure out what that might be, I don't think ever I have seen an electronic connector coming out of a servo??
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Re: Difference of brake servos mk5

Postby Mac1984 » Mon Jun 04, 2018 3:05 pm

I assume that will be some kind of pressure switch. Supposed to signal if there is vacuum loss or something.

Did not work anyway, so I have no problem exchanging that for one without sensor..

Has anybody replaced the servo before? Can that be done with the master cylinder in situ? So loosing the nuts at the front and back and pull it out? Probably not but I thought it's worthwhile to ask, maybe someone has done it .

Cheers
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Re: Difference of brake servos mk5

Postby gotgcoalman » Mon Jun 04, 2018 4:52 pm

Changed 1 on a Sierra years ago without undoing the the master cylinder brake pipes.
If the pipes will flex enough it'll be doable.
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Re: Difference of brake servos mk5

Postby Mac1984 » Mon Jun 04, 2018 10:03 pm

Cheers,

I have a look at it this weekend. It's my daily driver so I can't really effort too much downtime..
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Re: Difference of brake servos mk5

Postby cherniy_chack » Tue Jun 05, 2018 2:49 pm

Hi, Mac1984.
Perhaps the second photo shows a vacuum pressure sensor.
A car with ABS?
On the MK5 master cylinder with two holes for ABS and for nonABS.
The rear service brake cylinders are the same for all types of rear axles.
The front wheels may differ depending on the type of the front axle-14 "or 15".
On the MK6 brake parts are different.
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Re: Difference of brake servos mk5

Postby Mac1984 » Tue Jun 05, 2018 8:55 pm

Thanks cherniy chack,

Appreciate your input.

Do you know what warning light is supposed to come on in connection with the pressure sensor? I read somewhere that it would be the engine management light? Seems odd. And with the epic, sure that light was on all the time anyway ;-)

I took out the bulb after switching to Bosch. I suppose most likely the servo would leak around the seals? Maybe even around the sensor? I try and fit different servo and see if there is any difference ..

Cheers for all the help guys
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Re: Difference of brake servos mk5

Postby cherniy_chack » Wed Jun 06, 2018 5:22 pm

It is possible that in case of insufficient vacuum the "Check" will light up and the motor will go into emergency mode. For security reasons.
After replacing Lucas EPIC with Bosch, the need for a vacuum sensor disappears.
The vacuum amplifier can be replaced by any other such diameter without a hole for the sensor.
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Re: Difference of brake servos mk5

Postby Mac1984 » Wed Jun 06, 2018 10:51 pm

Thank you very much for your reply.

I am thinking of replacing the servo and master brake cylinder in one go, rather doing the servo only.

I see that the Mk6 connection to the brake pedal looks different all right, but I am wondering if there is alternatives that can be installed? I'm thinking as long as the master brake cylinder connects to the brake lines, and the servo fits to the pedal and the brake cylinder, it should work..?

Prices for the stuff seems steep. The non abs master brake cylinders are way cheaper, but I admit I want to keep my abs functioning as long as I can.

What is the main difference? Only the return lines to the reservoir? I noticed my master brake cylinder has a connection in the middle that has a blind plug in it.. is there a way of alternative?
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