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post #1 of 17 (permalink) Old 17th May 2013 Thread Starter
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hard brake pedal

I have a problem with the brake pedal on my espace which has just started it only happens on tick over when I'm in traffic and just creeping forward on tick over after a few times on the brake it goes hard like the servos not working if I give it slightly more revs when moving forward its then ok there no problem with tick over like high revs or uneven running and normal driving there no problems I can't hear any any leaks from servo like hissing and the pedals fine when you hold the brake on its like there's a partial blockage in the pipe that goes from the engine to the servo and at tick over its not enough do its job
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post #2 of 17 (permalink) Old 17th May 2013
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Re: hard brake pedal

If you cant find any leaks then it could be the vacume pump,

Who would design a vehicle that falls over when you stop?

If you find a fix for your problem please let us know it will help others.
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post #3 of 17 (permalink) Old 20th February 2014
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Re: hard brake pedal

Ok done a search and this is the nearest I can find to my problem..cars been fine since I bought it back in Jan but today while I was out all off a sudden I found the car had a hard brake pedal..then a normal pedal..then a hard pedal again..cant check the pads and calipers and rear brakes due to the weather ..but master cylinder is full to max mark with fluid..turn engine off and pump up the brake pedal turn on engine and the vacuum releases and thats how its supposed to be well at least that what I have always read is right..cant find any fluid leaks in the cabin at the back of the brake cylinder and vacuum hose on the servo seems sound ..servo does hiss when brakes are operated..so over to you guys MOT looming at the end of the month so what do you think..
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post #4 of 17 (permalink) Old 20th February 2014
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Re: hard brake pedal

Don't like intermittent brake faults

Servo or vacuum failure would normally leave pedal hard and no braking assist.
For an intermittent failure either Vacuum is not being trapped by the servo check valve or not being released by the pedal movement, which opens a vent valve on the pedal side of the servo diaphragm
Turn engine off and leave for a while. Then pump pedal. If hard immediately or in first couple of pumps, I'd suspect a faulty check valve. Most servos will store enough vacuum for four maybe five pumps.
If memory serves, you still have a few days of warrantee left. Could be a good time to report a problem and set a stake in the ground in case its a servo change needed.

Won't be a fluid or pad/caliper problem as they would leave you with no pedal

Above is assuming the renault haven't messed with normal servo design.
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post #5 of 17 (permalink) Old 20th February 2014
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Re: hard brake pedal

Just to add to your good advice. If you keep feet down on pedal and then start engine the pedal should sink slightly. That is your general guideline of a working servo. Yours seems to have air or sealing problems. Worth thinking about servo pump as well from engine.

Sometimes a collapsed brake hose can give hard pedal but I doubt it in this case.
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