SeriousIIa Posted June 26, 2012 Share Posted June 26, 2012 In my 350 powered 127 I'm not yet satisfied by the stopping abilites. I've fitted a TD5 ABS double servo to a non ABS system, which gives some extra omph. The brakes lock up fine when I'm driving on the highway (4 smoking 36m inch tires) or around town. But when manouvring offroad I miss some extra assist. This is probably because I'havent got a lot of vacuum at all especially at WOT. This is because of a special high performance camshaft. So I'm playing with the idea to put an electric vacuumpump paralel to the exisiting system with a one-way valve to the manifold in that way I've always got enough vacuum pressure. Please your opinions about this solution? And is there a standard what the vacuum should be normally for braking? can I measure this? Cheers Bowy Quote Link to comment Share on other sites More sharing options...
RangeyRover Posted June 26, 2012 Share Posted June 26, 2012 Not sure about a system in parallel, but several thoughts here: Electric pump from x type Jag Diesel Vac pump running off alternator? Hydroboost system from US (Proven system for off road) Quote Link to comment Share on other sites More sharing options...
zoltan Posted June 26, 2012 Share Posted June 26, 2012 Just pondering on how much vacuum you have available, would the addition of a vacuum cylinder help matters, giving you a reserve of master-cylinder assistance Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted June 26, 2012 Share Posted June 26, 2012 Do you have a one-way valve to stop the vacuum in the brake cylinder disappearing when you open the throttle? TD4 Freelanders have a vacuum reservoir for the turbo/EGT actuators, one of those after the one-way valve might help. Quote Link to comment Share on other sites More sharing options...
Julian Posted June 27, 2012 Share Posted June 27, 2012 I think this is an age old problem when fitting lumpy cams. I'd not bsugger around trying to graft in electric pumps from other vehicles and would be looking to fit a proper system and delete engine vacuum entirely. http://www.summitracing.com/search/?keyword=vacuum%20pump&dds=1 Julian. Quote Link to comment Share on other sites More sharing options...
SeriousIIa Posted June 28, 2012 Author Share Posted June 28, 2012 Thx for the input, I will go and look for a purpose electric vacuumpump Quote Link to comment Share on other sites More sharing options...
tacr2man Posted June 28, 2012 Share Posted June 28, 2012 To operate properly, a power brake booster needs at least 16 inches of vacuum at engine idle. If the vacuum drops below 16 inches, the booster looses power and seriously affects braking performance., HTSH Quote Link to comment Share on other sites More sharing options...
Daan Posted June 28, 2012 Share Posted June 28, 2012 Agreeing with fridge here: if the brakes are ok at one particularly rpm, but not on others, your non return valve is not working properly. Try switching of the engine and brake; if it has no boost, your one way valve is broken. Daan Quote Link to comment Share on other sites More sharing options...
SeriousIIa Posted June 29, 2012 Author Share Posted June 29, 2012 The one way valve is only a few months old and working fine. it is just that after a few times of fast braking at stationary speed, I loose power. So that's the reason I;m looking towards a vacuumpump. Quote Link to comment Share on other sites More sharing options...
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