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post #1 of (permalink) Old 13th June 2014 Thread Starter
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Question brake pedal sinks

My 2010 renault grand scenic 1.5 diesel has brake pedal creep. Brakes work fine but were spongy when I bought it 3 months ago of fleabay.
Lately sitting at traffic lights even with the lightest possible pressure to stop the car rolling, the pedal sinks to the floor in about 10-30 seconds, seems to vary slightly from day to day

I or 2 pumps & pedal quickly rises only to slowly sink again. Engine off 1 or 2 pumps pedal becomes very hard & does not sink.

No loss of fluid from reservoir. No visible leaks. Still sinks with all calipers clamped off & engine on. Worn rear discs & pads replaced then rebleed didn't help at all. Replaced master cyl & rebleed seemed to help for a few weeks but now sinking again. ABS works fine have tested it on gravel drive & no lights on dashboard. I know a sticking valve in the ABS pump could cause pedal creep but looking at cheaper fixes 1st.
Tonight I Removed servo hose from engine and brake obviously harder but feels more normal & no sinking. Could it be a faulty servo? Or faulty internal valve in servo.
Currently in timwesthead's garage:
grand scenic 1.5 dci 2010
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  5 Lastest Threads by timwesthead
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brake pedal sinks Brakes/Hubs geezerone 7 2452 13th June 2014 11:11 PM
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