Sevo knackered?

MilesnMiles · Post by **MilesnMiles** » Mon Jun 20, 11 8:53 am

Brakes have hardly any assist.
Press pedal with car idling and hear whoosh of air from servo and idle increases.
Put vac guage on inlet and vac drops from 18-16 when pedal depressed.
Knackered?
Just fitted new master cylinder

ANTON · Post by **ANTON** » Mon Jun 20, 11 9:48 am

Which Servo is it as I have repaired a few of them now even the sealed bendix one.

MilesnMiles · Post by **MilesnMiles** » Mon Jun 20, 11 10:37 am

Not sure Anton. Is there an obvious way to check? Also, what is involved in repair as i've never had this problem before?
Thanks

MilesnMiles · Post by **MilesnMiles** » Mon Jun 20, 11 10:42 am

One of these?

http://www.rockauto.com/catalog/raframecatalog.php

ANTON · Post by **ANTON** » Mon Jun 20, 11 1:25 pm

MilesnMiles that links didn't work

MilesnMiles · Post by **MilesnMiles** » Mon Jun 20, 11 3:26 pm

Anton, I've attached it here, hopefully...

ANTON · Post by **ANTON** » Mon Jun 20, 11 5:40 pm

That the one way vacuum valve that goes into the servo. They cost about $50 to replace and a readily available.
I thought your servo behind the break master cylinder was broken.

MilesnMiles · Post by **MilesnMiles** » Mon Jun 20, 11 6:04 pm

Anton, it doesn't seem to be a physical problem. Like I said above, it seems like vacuum is escaping

ANTON · Post by **ANTON** » Tue Jun 21, 11 6:48 am

MilesnMiles it seem that it may be you servo it's self. The may be a tear in the internal diaphragm. Can you post a link to the type of servo you have.I don't think the problem is the one way valve. You can test the valve by removing it off the car and blowing through it from both directions. You should be able to blow one way but not the other way. If air is escaping check the rubber grommet that holds the one way valve in and if all checks out then I think it may be and internal issue with the servo itself.

MilesnMiles · Post by **MilesnMiles** » Tue Jun 21, 11 9:30 am

Thanks Anton, I appreciate the detailed feedback. I'll take a closer look later in the week and report back.