Thread: S40 (New) Brakes : - Break Issues!!!
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Old Dec 13th, 2006, 17:16   #5
7050man
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Last Online: Jan 25th, 2019 17:19
Join Date: Feb 2006
Location: Kent
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Quote:
Originally Posted by Metblackrat View Post
The servo is exhausted by the inlet manifold on a petrol engine but a diesel will not draw enough air to do this so it operates from a small air pump that exhausts the servo.

To see if it is a servo failiure, pump the pedal with the engine turned off. The pedal should go hard and if it feels the same as when you had the brake pedal lock then thats the likely problem.
Thanks metblackrat, I thought there was a pump in there somewhere, but wasn't sure where or quite why.
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