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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22750
Experience:  BEng hons Mech engineering, in auto industry 22 years
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What is the most likely cause brakes on a 2007 Jag

Customer Question

what is the most likely cause for the brakes on a 2007 Jag Xtype 2.2 diesel estate to gradually start to bind when the servo ,master cylinder, vac pipes and callipers are all ok ,brake system bled properly by professionals, yet the brakes seem to gradgually be being applied as if the bake pedal is being pushed or the vac pump is running when it should not my mechanic is scratching his head now , have you come across this fault before , could it be an electrical fault rather than a mechanical one???????.
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
Hello this could be the adjustment available on the servo actuation rod so you remove the master cylinder again and have your assistant push down on the brake pedal to expose the pushrod as it exits the servo on the end of the pushrod there should be a little adjustment nut try screwing thisin a turn or two and put it all back together this adjustment takes out free play at the pedal so its better to have a little bit of play rather than too tight
Customer: replied 2 years ago.

answer not satisfactory cannot believe a skilled mechanic of more than twenty years experience is incapable of knowing how to set the push rod on a servo unit and not apply that adjustment .

Expert:  Matt replied 2 years ago.
Hello thats a reasonable expectation, however still worth asking your mechanic about it other possibilties are a faulty brake pedal switch thats running the pump continously as you say it should only run to provide vacuum pressure to the brakes
Expert:  Matt replied 2 years ago.
Hi Paul

do you still need help ?