Gwyn Posted September 7, 2008 Share Posted September 7, 2008 Hi there, new to the forum but not to Fords Problem with the brakes, ford focus ST170, coming to a stop from around 20-15mph to 0, you can feel the brake pedal pumping (not fast, around once a second). Is this an abs sensor fault or warped front discs, the car has just covered 27,000. Any suggestions or experiences with this type of problem Gwyn Quote Link to comment Share on other sites More sharing options...
mintalkin Posted September 7, 2008 Share Posted September 7, 2008 90% sure it will be a warped disc Quote Link to comment Share on other sites More sharing options...
Gwyn Posted September 7, 2008 Author Share Posted September 7, 2008 90% sure it will be a warped disc thanks for that info mintaklin I'll source some discs this week, my previous car did 127,000 (9" solid discs) miles with the same discs, so much for 300mm vented discs brakes Quote Link to comment Share on other sites More sharing options...
mintalkin Posted September 8, 2008 Share Posted September 8, 2008 see if you can get hold of a dial gauge to check the run out of the discs before buying new just in case its something else Quote Link to comment Share on other sites More sharing options...
Gwyn Posted September 8, 2008 Author Share Posted September 8, 2008 see if you can get hold of a dial gauge to check the run out of the discs before buying new just in case its something else Hi mintalkin What's the max +/- in mm/thou (run out) you would expect to get on a dial guage reading before rejecting the discs. kind regards Gwyn Quote Link to comment Share on other sites More sharing options...
mintalkin Posted September 8, 2008 Share Posted September 8, 2008 anything above 0.1mm (0.004”).would most likely cause pulsating Quote Link to comment Share on other sites More sharing options...
Gwyn Posted September 8, 2008 Author Share Posted September 8, 2008 anything above 0.1mm (0.004”).would most likely cause pulsating Thanks again mintalkin. Will borrow a DTI from work midweek, will post the result hopefully by the weekend. regards Gwyn Quote Link to comment Share on other sites More sharing options...
Gwyn Posted September 13, 2008 Author Share Posted September 13, 2008 Thanks again mintalkin.Will borrow a DTI from work midweek, will post the result hopefully by the weekend. regards Gwyn DTI checks on each corner Front off-side 0.03mm Front near-side 0.03mm Rear off-side 0.02mm Rear near side 0.45mm It was obvious when I jacked up the car (Rear-near side), that this was the culprud, the wheel was binding when Hand turned at one particular point, Further investigation showed a deviation of .45mm at this point for approx 12cm. Have ordered some discs today and hopefully put them on Tuesday evening. The brakes on this corner must have been running hot, hence affecting the performance & MPG. Thanks again Mintalkin regards G Jones Quote Link to comment Share on other sites More sharing options...
mintalkin Posted September 13, 2008 Share Posted September 13, 2008 no problem glad you found the culprit Quote Link to comment Share on other sites More sharing options...
Gwyn Posted September 16, 2008 Author Share Posted September 16, 2008 no problem glad you found the culprit I fitted new rear discs and pads this afternoon, it solved the problem. Used Ford origional parts, worst job was to push back the piston in the caliper. Your suppose to use a special ford tool, I got away with a 4" G clamp, made for the job, allthough it required a lot of effort to push the piston back. Happy motoring ps Thank god for forum's, saves a fortune in the end and a real satisfaction of doing and solving the problem yourself. Gwyn Quote Link to comment Share on other sites More sharing options...
Rikos Posted September 17, 2008 Share Posted September 17, 2008 Really glad that you managed to get this sorted And good to see the forum could help ... thats what we're here for! Quote Link to comment Share on other sites More sharing options...
vinnyvangough Posted September 17, 2008 Share Posted September 17, 2008 Result for FOC Quote Link to comment Share on other sites More sharing options...
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