landrover598 Posted October 24, 2016 Share Posted October 24, 2016 I've been battling with rubbish brakes for years and i'm out of ideas now, i don't think they'll pass the MOT this year so need some suggestions. Stopping from 70 down to say 30 is ok, but from 30 down to 0 is hopeless, and absolutely cannot lock up the tires (235 grabber tr). Over the years the following has been fitted: Larger 110 front calipers, 110 vented grooved front disks, rebuilt rear calipers, solid rear disks,both Mintex and Delphi Lockheed pads all around, Lama stainless braided hoses all around, copper solid lines, rebuilt master cylinder, new servo, Dot 4 fluid replaced about 2 years ago and bled with ezi-bleed, good vacuum can be felt on the hose and the pedal drops when servo is evacuated. Any suggestions? Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted October 25, 2016 Share Posted October 25, 2016 Could you describe the actual symptoms? I.e. Soft pedal, excessive travel, etc Quote Link to comment Share on other sites More sharing options...
Snagger Posted October 25, 2016 Share Posted October 25, 2016 What brand were the parts? Anything Britpart is highly suspect. If none of the wheels can lock, it suggests a lack of hydraulic pressure, meaning the master cylinder, servo or bad bleeding. Quote Link to comment Share on other sites More sharing options...
muddy Posted October 25, 2016 Share Posted October 25, 2016 I wouldn't expect to be able to lock up, if you reverse and brake hard will the fronts lock? I'd start by changing the pads sounds like typical glazing to me. Quote Link to comment Share on other sites More sharing options...
landrover598 Posted October 25, 2016 Author Share Posted October 25, 2016 10 hours ago, Chicken Drumstick said: Could you describe the actual symptoms? I.e. Soft pedal, excessive travel, etc Just very poor stopping ability, I can push as hard as i like on the pedal but it wont slow down any quicker. Pedal is firm but has little effect on stopping. Parts are a mix of Genuine, Bearmach and Delphi. Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted October 26, 2016 Share Posted October 26, 2016 I think you need to take it to a garage to look at. Brakes are probably the most important thing on a vehicle. And it is rather worrying to know someone is driving around in a vehicle that they can't stop. Defender brakes should work very well and easily pull the speed in. But I doubt it's an easy think to diagnose over the internet. Quote Link to comment Share on other sites More sharing options...
Snagger Posted October 26, 2016 Share Posted October 26, 2016 Like I said, if no wheels lock, it has to be a part common to all four, and that is just the master cylinder and the servo system. If the master has needed rebuild, it stands out as a suspect, but the new servo is not above suspicion either. I'd also check the vacuum pump - it might be producing a pressure drop, but it might not be low enough. Quote Link to comment Share on other sites More sharing options...
steve b Posted October 26, 2016 Share Posted October 26, 2016 You could eliminate the vac pump by using an electric one like Boydie has on his disco . Is the G valve working ok and oriented correctly ? Also , are you using a defender M/C to match up to the calipers? cheers Steveb Quote Link to comment Share on other sites More sharing options...
Souster Posted October 26, 2016 Share Posted October 26, 2016 You can check the vacuum pump by buying a cheap vacuum gauge and checking the reading. I doubt it's that though to be honest if the pedal is sinking on start up, and if the pedal feels like it has servo assistance when the engine is running it doesn't sound like servo or pump. If the pedal is firm and doesn't creep at all (air or failing master cylinder) I'd be inclined to try another set of brake pads. Delphi or ferodo. They arent expensive. Other than that, there isn't much more it can be. Just make sure all bleed nipped are at the top of each caliper so it can be bled correctly. HTH 1 Quote Link to comment Share on other sites More sharing options...
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