I have a mk11 ba typhoon with pbr brakes. Got the dreaded shudder with all the usual symptoms. Turns out its the booster that's failed and does not release properly. Get it fixed by Ford and all is good. They told me that Ford head office has told them not to adjust the rod it does not fix the problem. Before anyone says that they are trying to make money I got it fixed under the extended warranty I bought. Costs about 360 bucks plus labour so should be cheaper non genuine.