How much suck should the vac pump suck? - Defender Source
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  #1  
Old May 27th, 2015, 10:56 AM
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Bill Adams
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How much suck should the vac pump suck?

So how do I tell if my vac booster pump is doing the job? To me it doesn't seem like it is adding much boost to the braking. I have to use quite a lot of size 11 on the pedal, so it seems.
I did a very non scientific test and pulled the vac hose off the booster with the engine running and stuck my finger over the end to test the draw. It was pulling vac but seemed kind of weak.
200 tdi BTW
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  #2  
Old May 27th, 2015, 11:02 AM
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Jafir Elkurd
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The manual says that the one on the 2.5 should produce at least 0.8 bar at 2500 rpm.
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  #3  
Old May 27th, 2015, 11:03 AM
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John B.
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Manual says: "Minimum vacuum level at 2500 rpm ...................... 0,8 bar"
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  #4  
Old May 27th, 2015, 01:01 PM
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Luis Constantin
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When I read the header, this is all I could think of.

http://youtu.be/17CKHuYx51U
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  #5  
Old May 27th, 2015, 01:29 PM
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Hm. guess I'm ok then
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  #6  
Old May 27th, 2015, 02:13 PM
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John B.
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Well, you need to check both devices.... A vacuum pump and gauge are needed. The booster could be leaking.
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  #7  
Old May 27th, 2015, 02:46 PM
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Test the hardness of the brake pedal prior to start the engine. Apply the brake and turn on the engine. You should feel the difference.
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Old May 27th, 2015, 03:45 PM
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Eric Williamson
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Not meaning to highjack, but just reminded me that my hose is collapsed. Brakes seem fine. Any specific replacement hose recommended?
Regards, Eric.
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  #9  
Old May 27th, 2015, 04:40 PM
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mark kellgren
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Quote:
Originally Posted by Whiesel View Post
Not meaning to highjack, but just reminded me that my hose is collapsed. Brakes seem fine. Any specific replacement hose recommended?
Regards, Eric.
the LR reinforced brake vacuum hose is what you want. it's designed for brake servos under vacuum and won't collapse. took me 6 years to catch on to that little tip. CRC2131
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  #10  
Old May 27th, 2015, 06:01 PM
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Not trying to under cut folk. Just pains me to see rover part numbers on non rover goods and people spending their $$$ on them.

LR does not make any hoses... or even spec them. If its the cheapest/best value sure. Hose is hose.
Buying an overseas hose is not going to work out for the best value I would assume. Hose is hose, unless you need a particular stamp for the concourse judges. Furthermore, i just don't trust anything branded LR.. or Lucas... etc.

When I need specialty hoses I just go to the hose store (literally) Hydro shop has all the hose for any application and knows what its specs are. And I have yet to pay for any hose from a hydraulics store. Its frequently priced by the yard and they don't bother to math out 6 inches or whatever. Not worth writing up the bill. Learn your commercial suppliers down in the industrial park. They save you a ton of headache and money.
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Old May 27th, 2015, 06:28 PM
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mark kellgren
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Quote:
Originally Posted by DefenderMd View Post
Not trying to under cut folk. Just pains me to see rover part numbers on non rover goods and people spending their $$$ on them.

LR does not make any hoses... or even spec them. If its the cheapest/best value sure. Hose is hose.
Buying an overseas hose is not going to work out for the best value I would assume. Hose is hose, unless you need a particular stamp for the concourse judges. Furthermore, i just don't trust anything branded LR.. or Lucas... etc.

When I need specialty hoses I just go to the hose store (literally) Hydro shop has all the hose for any application and knows what its specs are. And I have yet to pay for any hose from a hydraulics store. Its frequently priced by the yard and they don't bother to math out 6 inches or whatever. Not worth writing up the bill. Learn your commercial suppliers down in the industrial park. They save you a ton of headache and money.
yes, the LR is precut packaged commercial HD brake hose. I did what you had mentioned and researched the industry standard part no for that particular hose and tried to track down the right size to no luck. At $11 from Rovahfarm, the 2 hours I spent to save a couple bucks ended up not being a good use of my time. And this is after going to Autozone and NAPA asking what they had for brake servo hose and getting the deer in headlights look.
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  #12  
Old May 27th, 2015, 06:53 PM
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Quote:
Originally Posted by Overlander View Post
yes, the LR is precut packaged commercial HD brake hose. I did what you had mentioned and researched the industry standard part no for that particular hose and tried to track down the right size to no luck. At $11 from Rovahfarm, the 2 hours I spent to save a couple bucks ended up not being a good use of my time. And this is after going to Autozone and NAPA asking what they had for brake servo hose and getting the deer in headlights look.
yea... auto parts stores suck....
its worth the effort in the long run to find the guys/places that have their crap together. it pays off on so much stuff. some of those parts that you really have to compare to get the right one.. or a good substitute.
that said... not everyone lives in an area with many useful people. US capitol area for instance. distance between each worth while individual is at least 30 minutes...
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  #13  
Old May 27th, 2015, 06:55 PM
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John B.
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You need to make sure you purchase hose rated for vacuum use. Most hose is not.
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  #14  
Old May 27th, 2015, 07:27 PM
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Ben
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brake booster hose is fairly common
VL DOT is what it would say on it. VL for vacuum line i believe.
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