santalars Posted December 9, 2009 Share Posted December 9, 2009 My 90 has failed the DOE (MOT equivalent in Ireland) yesterday. 13 complaints in total, 10 of these are like "worn out door hinge", "loose wires in engine bay" Will get them easily sorted over the weekend. However one of the serious ones was "poor brakes". They miracusly found differential braking on application of the parking brake. Could anyone tell me how this is possible when the brake on the propshaft? I would have thought that both wheel will be absolutely the same than. I have new cylinders in the calipers and new braided hoses. New pad as well. The bias valve looks optically a bit poor (corrosion). As I need to improve the brake performance, would you think it's rather the bias valve or the master cylinder which needs replacement. I would have thought that bad brake performance comes as a standard with a Defender. Although I personally think that my brakes are really good. Quote Link to comment Share on other sites More sharing options...
crwoody Posted December 9, 2009 Share Posted December 9, 2009 "...They miracusly found differential braking on application of the parking brake.... I would have thought that both wheel will be absolutely the same..." Could that be because the braking force is applied via a differential? If you apply the handbrake where there is less grip on one side then one wheel will carry on rolling and the one with least grip will slip, maybe even turn backwards. Sounds to me like your tester has no experience of transmission brakes, or Land Rovers in general. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted December 9, 2009 Share Posted December 9, 2009 Ask them to clarify the results, if the tester showed differential braking then it will be able to tell you what wheels were involved and what values. As the post above says, it's most likely a mis-understanding of the LRs transmission brake Quote Link to comment Share on other sites More sharing options...
ejparrott Posted December 10, 2009 Share Posted December 10, 2009 If you need to improve brake balance, then first I'd recommend a good clean and service of the the brake components. Have you a drum-brake rear axle? It seems as though you have disk all round but Im not sure...a hugh number of people never adjust the drum brakes and wonder why they dont work properly.. When you say the pads are new..are they brand spanking new, or have they done a few miles and bedded in? I take it they tested the brakes on the road...and the handbrake on a hill..... I think I'd be seeking a second opinion myself...but I'm not familiar with the differences between MOT and DOE Quote Link to comment Share on other sites More sharing options...
santalars Posted December 10, 2009 Author Share Posted December 10, 2009 Thanks for the replies! The pads (disks all round) are well bedded in, and I have recently serviced the brakes including new seals and cylinders. I have the impression that they work better than ever. This is the report: Quote Link to comment Share on other sites More sharing options...
HPLP Posted December 11, 2009 Share Posted December 11, 2009 me thinks they want money! The DOE over here can be soooo variable. H Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted December 11, 2009 Share Posted December 11, 2009 It appears they have flagged up a difference in braking force between the right and left rear wheels under application of the parking brake... Suggest that they show you how one might avoid this when there is an open differential on the axle in question... Quote Link to comment Share on other sites More sharing options...
santalars Posted December 19, 2009 Author Share Posted December 19, 2009 Ok, I have sorted everything, but I have again failed the DOE. All ok, except from the rear brake effectiveness. There are 3% missing (and this is afer some slight manipulation of a computerised testing rig). Master Cylinder: New Bias Valve: New Rear caliper pistons and seals: New Rear break hose: 2 year old goodrich braided hose Rear pads: new Rear disks: good System bleeded excessively We have closely checked the brakes and there appears to be nothing wrong. All copper pipes and they are fine. I will now replace the rear calipers with new ones (yes, I'm that desperate) and will put in a new hose. Any ideas what else could be worng???? Quote Link to comment Share on other sites More sharing options...
western Posted December 19, 2009 Share Posted December 19, 2009 I'd go to a different test station, one that knows how LR's work. Quote Link to comment Share on other sites More sharing options...
gaz0203 Posted December 19, 2009 Share Posted December 19, 2009 id try doing a few miles in it, if there new discs and pads theyl take some time to bed in and give correct readings Quote Link to comment Share on other sites More sharing options...
LandyLee Posted December 19, 2009 Share Posted December 19, 2009 How are they testing the brakes ?? we use a decelermometer to test 4x4s as they can`t be tested on a 2 wheel rolling road. Quote Link to comment Share on other sites More sharing options...
Gazzar Posted December 19, 2009 Share Posted December 19, 2009 Go to J L Bradshaws in Portlaoise. You have to book etc. Jimmy tests my 109 every year - does some other LRs. Honest and by the book. Isn't after a bribe like most of them, nor does he give a stuff about making work for the garage, as there isn't a garage. If it isn't right it fails, and vice versa. g. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted December 20, 2009 Share Posted December 20, 2009 Any ideas what else could be wrong???? yup. The tester. Quote Link to comment Share on other sites More sharing options...
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