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Discussion Starter · #1 ·
Mk3 2005 Mondeo Ghia X

Hi guys

Experiencing hard brake pedal when stopping.

ie coming to junction/roundabout press brakes as normal and everything seems fine, car slowing, then hard pedal and feels like nothing.

Really press or let go and try again and it seems OK.

Had this a while back so took it in and no obvious symptoms. No ABS light. Changed pads all round and fresh fluid.

For the MOT last Sept it had 2 new rear callipers.

No leaks anywhere.

Air? Vacuum Pump? ABS pump? or Master Cylinder?

Car is parked on a slope overnight.

Cheers in advance.
 

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Big Megger
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could be loads of things but check your servo pipe, on the petrol it has a one way valve so pull it out the servo and blow/suck down it make sure its working.
 

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+1 stripe88. Is this a diesel or petrol?
 

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You should be able to pump the pedal more than once before using up the vacuum. I think only the diesel has a vacuum pump (the intake manifold in a td never gets much below normal atmospheric pressure, and spends most of its time well above that), so hopefully easier to fault find on yours...
 

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Yeah no vacuum pump on a petrol car, It uses the inlet manifold vacuum.

An air leak on the manifold can cause issues. Check the pipe between the

manifold and servo.

How long have you had the car?
 

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Discussion Starter · #7 ·
Update:

Still got the issue but seems to be happening when the car is cold/warming up - it is difficult to tell as I only work 2 miles away so doesn't really get warm.

Had a good run down the motorway last weekend and brakes were working if a little snappy.

Needed to emergency stop when a Taxi pulled out on a main road - all good

Beginning to suspect sticking servo valve

Had car 6 years and it has been fantastic.
 
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