DiscoClax Posted September 11, 2009 Share Posted September 11, 2009 G'day all, My Disco has become a weekend warrior in the last couple of years due to the wonders of a company car When I drive it now, it takes an enormous amount of pedal pressure to get the bugger to slow down. I'm not a small bloke and at maximum attack I can't lock the tyres anymore. It seems to have degraded slowly over the last couple of years with more and more pedal pressure required to slow it down. Because of that it has taken me a while to realise it's not as it should be. It's always had a firm pedal and I know that modern cars are over-assisted to buggery so was expecting to have to use a bit more welly, but now beyond a joke. If I pump the vac out (engine off) and then hold the brake pedal down whilst starting I can feel it "pull" the pedal down as it starts (as expected), but only very slightly, and not nearly what I'd expect. I've checked for a vac leak in the booster hose and it seems OK. Equally, disconnecting the booster hose from the manifold and plugging the manifold hole indicates that the booster system isn't leaking significantly either (ie. no change to engine revs/smoothness with it plugged or connected, big difference when open as expected). No big difference between cold and warm, quality brake pads fitted with lots of life, etc. Note that the pedal is hard, not spongy. Like someone's put a big chunk of dense rubber between the pedal and floor. Are there known issues which would explain this? Should I just replace the booster? I've got a fully functional spare out of a D2 V8 so that's no problem, but don't want to do it unnecessarily if it's something else. As always I would welcome any thoughts, comments or suggestions from the brains-trust. Cheers. Quote Link to comment Share on other sites More sharing options...
errol209 Posted September 11, 2009 Share Posted September 11, 2009 Sounds almost exactly the smae as the problem on my 90 (apart from the fact you can stop yours with two of you on the pedal) and I've narrowed it down to the servo unit. I think the valve inside isn't allowing the atmosphere in to make the servo (booster) do anything, so I've downloaded a new one of Eblag and will be fitting it this weekend, and am hoping this will fix it (its the only thing left really, so it'd better be ...) Quote Link to comment Share on other sites More sharing options...
SPendrey Posted September 11, 2009 Share Posted September 11, 2009 Agreed, I'd suspect the servo too. Mine did just the same (thread on here about 2 weeks ago)... a new (old) servo fixed it. Quote Link to comment Share on other sites More sharing options...
DiscoClax Posted September 12, 2009 Author Share Posted September 12, 2009 Thanks guys. It's what I suspected (hence getting the replacement unit), but nice to have it confirmed by others before I go rounding off nuts and losing skin for no reason. *sigh* now to find some spare time... Cheers. Quote Link to comment Share on other sites More sharing options...
errol209 Posted September 13, 2009 Share Posted September 13, 2009 Just to finish this thread off, I fitted a new servo yesterday and its all sorted. Sorry for the delay in posting, but the smacking of the bridge of my nose into the steering wheel during post-install testing left me quite dazed Quote Link to comment Share on other sites More sharing options...
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