Baz2236 Posted May 2, 2013 Share Posted May 2, 2013 I have now tried 2 new servos and 2 vac pump but still I have rubbish brakes and only 1 chance to really stop. The more I try and brake the harder the pedal gets and less servo assistance I get. My orginal servo works better with a split in the seal which looses vac once motor is stopped. Do I have a problem elsewhere but where do I look. Barry Quote Link to comment Share on other sites More sharing options...
minimaquinas Posted May 2, 2013 Share Posted May 2, 2013 welcome to my world barry my 110 brakes are rock hard the wife doesnt like going in it with me its great for the quiet drives tho lol have you tried a new non return valve that is my next thing to try if you find the solution keep me posted cheers Quote Link to comment Share on other sites More sharing options...
Maverik Posted May 3, 2013 Share Posted May 3, 2013 Whats the age of the vehicle? i.e discs front, drum rears? Quote Link to comment Share on other sites More sharing options...
Baz2236 Posted May 3, 2013 Author Share Posted May 3, 2013 The servos I gave tries have different non return valves. Originally it had drum rears now its got discs. Baz Quote Link to comment Share on other sites More sharing options...
Maverik Posted May 3, 2013 Share Posted May 3, 2013 Oil contamination on your discs... or you've got a dodgy master cylinder, I'd say 90% of brake issue that pop up on here are master cyclinder related. - but its always the last thing to change out. Pretty much as a matter of course I've been changeing out the master cylinders on the vehicles I've been newly aquireing. Mav Quote Link to comment Share on other sites More sharing options...
Baz2236 Posted May 3, 2013 Author Share Posted May 3, 2013 I have near had enough of this. Today I have changed the Master cylinder and the vacuum pipe with a new one piece and still I only have one shot to stop the brake get worse and worse. I have bled the system 3 times and still got long travel on the pedal and carp brake on the first go at brake it still will not look up. I need some motivation to get me out there and try something else or I think it might be on ebay by the end of the weekend. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted May 3, 2013 Share Posted May 3, 2013 Wheel bearings okay? Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted May 4, 2013 Share Posted May 4, 2013 Baz, Lets recap again as it's getting a bit confusing. Is your pedal hard with little braking action ? - pointing to servo assistance problems OR Are your brakes spongy ? Pointing to air in pipes or loose wheel bearings OR You have a good pedal for the first push of the pedal but braking fades with subsequent pushes of the pedal immediately following the first. Mo Quote Link to comment Share on other sites More sharing options...
Baz2236 Posted May 4, 2013 Author Share Posted May 4, 2013 The last option good first pedal the next press is less affective and pedal gets harder and less affective. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted May 4, 2013 Share Posted May 4, 2013 Does the first push of the pedal have normal travel, or does it travel further than normal the first time and then comes back up towards the normal amount of travel the second, third, fourth time etc? Quote Link to comment Share on other sites More sharing options...
Baz2236 Posted May 4, 2013 Author Share Posted May 4, 2013 The First pedal press is about 3 quarters press after that are about the same more not quite as far down. I have check the Vac pump to day with my gauge I am getting 0.9 psi Quote Link to comment Share on other sites More sharing options...
Baz2236 Posted May 4, 2013 Author Share Posted May 4, 2013 I have been out playing with my new gauge and yes 0.9 psi is on idle on hard rev it goes to 1 I have noticed when I press the brake the vacuum goes down a bit but when I release it goes down further I have 4 attempts to brake then I have 0.2 vacuum left. If I brake sharp the vacuum goes downs to 0.5 but takes some time to rise back up unless I acclerate anyone know what values I should be seeing from the vacuum. I have but the gauge on a t piece in between the pump and the servo to get these readings. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted May 4, 2013 Share Posted May 4, 2013 Sounds like the vac pump is not man enough to maintain the vacuum in the servo. Was the replacement a new one ? That's all I can think of Just a stab in the dark but can the brake pedal be adjusted for stroke like the clutch ? Could you be bottoming out on pedal travel or m/c stroke ? Quote Link to comment Share on other sites More sharing options...
Baz2236 Posted May 4, 2013 Author Share Posted May 4, 2013 Yes it does get harder the more pushes. Quote Link to comment Share on other sites More sharing options...
western Posted May 4, 2013 Share Posted May 4, 2013 no brake pedal adjustment AFAIK, not seen any reference to it in the workshop manual. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted May 4, 2013 Share Posted May 4, 2013 defo a vacuum problem, the pump should be maintaining vacuum, it shouldnt be dropping off when you pump the pedal. Britpart pump? Quote Link to comment Share on other sites More sharing options...
DaveSIIA Posted May 5, 2013 Share Posted May 5, 2013 Have you checked the O ring seal between the master cylinder and the servo? A leak here would slow recovery of the vacuum in the servo. Quote Link to comment Share on other sites More sharing options...
cackshifter Posted May 5, 2013 Share Posted May 5, 2013 .9 bar at idle and 1 with a rev is as good as it gets from a new Wabco pump. So the pump sounds fine. Quote Link to comment Share on other sites More sharing options...
Baz2236 Posted May 6, 2013 Author Share Posted May 6, 2013 I have resolved my issue it turns out brand new servos from all makes are carp. I fitted my old servo to my new master cylinder and the pedal is great as are the brakes. Thanks for your help I just need to fix the seal on the servo now to stop it sounding like a kettle when I switch engine off. Quote Link to comment Share on other sites More sharing options...
Maverik Posted May 6, 2013 Share Posted May 6, 2013 wouldn't be the first time I've put fettled genuine LR stuff back on after premature failer of pattern parts, glad you found it before you drove the truck into a deep hole... Mav Quote Link to comment Share on other sites More sharing options...
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