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Mike, Jaguar Technician
Category: Jaguar
Satisfied Customers: 39198
Experience:  Tech Expert
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Jaguar s type, had a burst brake hose, during M.O.T.test, replaced

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Jaguar s type, had a burst brake hose, during M.O.T.test, replaced all brake hoses, now brake pedal does down half an inch by itself and puts on the brake lights.


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Customer: replied 4 years ago.

Jag S-type Petrol 2.5 V6 Auto 2002


During the MOT test a brake hose pipe burst. Have replaced all four brake hoses, which are of the stainless steel type and bled system. The brakes perform well on the brake rollers but on starting the engine the brake pedal now moves 0.5 of a inch downwards. This bring on the brake lights and holds effort on the brakes slightly. Why is this???

Cant find any fault with servo although on removing the main servo pipe this movement on the pedal is no longer there. Does this mean there is a problem with the servo itself???

Hello again -

Thank you for your reply.

This can be a servo fault - but more usually is the one way valve failing in the hard tube pipe that goes between the servo and the engine.

You can test the valve by blowing / sucking - it will be obvious if its gone altogether - but even if the results are not so plain - I would suggest renew that pipe / valve anyway - as its a common fault - and a lot easier / cheaper than a servo at this stage..

Best Rgds, MIKE.

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Mike, Jaguar Technician
Category: Jaguar
Satisfied Customers: 39198
Experience: Tech Expert
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