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[Big Bri]

My brake pedal is hard most of the time, I have replaced the vaccuum pipes and the one way valve but the problem is still there although there is plenty of vacuum, when I press the pedal lightly it does sink a bit but if I press hard it doesn't sink at all, could this mean that the servo is at fault, or is it possible that it is something else.

Thanks.

[rustym95]

do you know when the brake fluid was last changed, or what colour is it. may just need new fluid, full flush out.

[Big Bri]

Thanks for the reply the brake fluid was changed less than a year ago.

[Andy H]

It does sound as though the servo is at fault. Split diaphragm maybe? or perhaps the gubbins inside that controls the air/vacuum has seized.

I won't insult your intelligence by asking if the new vacuum non return valve is in back to front.

[Big Bri]

It does sound as though the servo is at fault. Split diaphragm maybe? or perhaps the gubbins inside that controls the air/vacuum has seized.

I won't insult your intelligence by asking if the new vacuum non return valve is in back to front.

    haha yes its on the right way

[Kevin Wood]

Try pumping the pedal half a dozen times with the engine stopped then, with moderate pressure on the pedal, start the engine. You should feel the pedal drop a little. Then turn the engine off and pump the pedal a couple of times. You should get assistance for 3 or 4 pumps of the pedal before it goes hard again.

If assistance is not working then it's vacuum supply to the servo or a fault in the servo itself. If you can feel the servo working then look for siezed caliper pistons, crushed brake lines or perhaps seriously glazed friction surfaces. :-/

Kevin

[Big Bri]

Thanks for your reply, I have solved the problem now, it seemed that one of the smaller pipes coming off the one way valve must have been leaking.