Sitec's 101..

Not heard of Hydro Boost, but Im going to look into air over hydraulic as I have continuous air on board. Well, the new booster is in, and the brakes are all bled, and I've been on a run. Maybe I'm too used to trucks that actually stop, but I think they're decidedly average. I'm wondering if my vacuum pump is not as good as it could be as I have a very firm pedal with minimal travel, but considerable effort is required to stop the vehicle from 100kmh. Will be doing some further investigation! Here is a Disco booster in a 101!

Better or worse than with the standard booster? A hard pedal does suggest lack of vacuum though.

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Originally Posted by bacicat

Better or worse than with the standard booster?

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Different... I've never thought the 101 to have good brakes.. But they were better as a V8 than they are as a diesel, which is who I am starting to question the vacuum pump. It stops going backwards now which it struggled to do before I changed the booster, but the pedal has a totally different feel now. Heavier! Will let u know once I work out how much vacuum there should be compared to what I have!

My mates F trucks have Hydraulic assist on the brakes, works off the power steering pump, only down side is they lose power steering while braking, seems an odd design:)

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Originally Posted by Brute

My mates F trucks have Hydraulic assist on the brakes, works off the power steering pump, only down side is they lose power steering while braking, seems an odd design:)

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they should not lose steering while braking, the hydro boost has a accumulator to prevent this, the ps pump should be plumbed into the booster then from the booster into the steering box.

If you think 101 brakes are bad you should test drive a 4x4 Daily , they are crap, which is why Im going for a hydro boost as soon as the kit is engineered. At least the Iveco PS pump is also designed as a hydraulic take off point

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Originally Posted by Brute

My mates F trucks have Hydraulic assist on the brakes, works off the power steering pump, only down side is they lose power steering while braking, seems an odd design:)

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The old Chevy C20 trucks (350ci v8) had this system as well. If the engine stopped you had absolutely NO assistance at all :eek2:. Scary when you have 10,000 litres of petrol on the back in a portable delivery tank!!!!

Cheers Rod:wasntme:

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Originally Posted by Sitec

Different... I've never thought the 101 to have good brakes.. But they were better as a V8 than they are as a diesel, which is who I am starting to question the vacuum pump. It stops going backwards now which it struggled to do before I changed the booster, but the pedal has a totally different feel now. Heavier! Will let u know once I work out how much vacuum there should be compared to what I have!

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Maybe you will have to fit a vacuum reservoir tank for the brakes.






Cheers Rod:wasntme:

Sitec , cant say i noticed a change in my brakes from the V8 to tdi change over, in the 5 days between driving from one engine to the other.

So, I get home tonight, and a mate is here, so we start the diagnosis.. We compare vacuum pump suction on various vehicles around the yard.. and the 101's seems passable, but we strip and clean the Pierberg pump anyhow. We re assemble it and go for a run with the vacuum hose shorter running straight to the booster. Brakes no better at this point.. I then have a 'Doh' moment and realise that I've found the problem!! The vacuum pump is pumping air out of its exhaust.... Which means there has to be a servo leak! Its at this point I realise where the leak is!! The 101 master cylinder is not a factory fit against the Disco Booster.. I'd bolted it on with no form of seal!!!!! The thought of removing it to fit an o ring or gasket and then bleeding everything again was straight out of the window!! I removed the fixing bolts, moved it back 10mm and have put some gasket sealer between the two!! Its now bolted tight and I've walked away for tonight!! Resisting temptation to test it while the goo is still wet, so Gav.... Remember to mfr and fit a rubber gasket between your master cylinder and booster!!!! ;)

Jeez I would never have thought of that... Thanks heaps. Hope it's all sorted. :)