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Hello to you all It was raining last Friday afternoon as I drove home during rush-hour. I was traveling downhill at about 35 mph in the right-hand lane of a dual carriageway when the BMW 540i in front of me suddenly braked sharply to avoid rear ending another car that had cut in front of it without signalling. I followed. Unfortunately I hit my brakes too hard and locked both rear wheels in doing so. The rear of my car broke away towards the left and turned the car into the curb on my right causing the right front wheel to connect the curb, still doing about 30 mph. The wheel ran against the curb for some distance and then the tyre burst, causing the rim to mount the curb while the rear of the car slewed round until the left front wheel hit the curb as well, violently stopping any further movement. The cars behind me managed to avoid hitting me and I did not hit anything else besides the curb. A post-mortem examination later that evening revealed no major suspension damage, just some loose front axle mounting bolts and quite a lot of upper torsion arm play. Both were fixed without hassle.I had to buy a new tyre, luckely the rim was OK, and get the wheels aligned. No problem either. So what does one do to fix a lockup problem? This was not the first time I had the rear wheels lock on me under emergency braking but I would like it to be the last. The condition of the various players in this saga is as follows: Tyres : 165R15 Firestone R510 textiles. Approx 6mm tread depth across the entire tread surface. Rear brakes : Overhauled by yours truly 500 miles ago. New shoes, new wheel cyl washers, wheel cylinders resleeved in stainless steel, rear brake drums within spec, new flexible rear hoses, new brake fluid. All correctly assembled, bled and adjusted. Brakes fully seated by now. Rear suspension : Double-jointed rear axle, slightly lower ground clearance due to old age, 2 degrees negative camber and 1mm toe-in on either side. Does anyone have any ideas? I am thinking of installing a pressure restricting valve in the rear brake line to prevent this from occurring again. (Poor man's ABS I suppose.) Has anyone done this before? Is it a good idea? Anyway, I'm grateful that no serious damage was done to my car and that I lived to tell the tale! All input from you people will be appreciated. Regards Adriaan Loedolff adriaan@norton.ctech.ac.za '69 Variant Automatic (200 000 miles + and still cruisin' after all of these years!)