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post #6 of 8 (permalink) Old 14th June 2014
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Re: brake pedal sinks

I agree had same problem i replaced internal seals now all ok paul
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post #7 of 8 (permalink) Old 16th June 2014 Thread Starter
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Re: brake pedal sinks

Thanks all for input.
I agree air in ABS is a possible cause as is sticky valve in the abs block. A renault dealer diagnostic found a 'possible internal fault' in the ABS & they quoted 1800 for a new pump supplied & fitted. They were suspiciously vague & I don't trust them an inch. A 2nd diagnostic after a new master cyl fitted found no brake faults at all! inc ABS
The brand new master cyl strangely seemed to help slightly for a few weeks. but the sinking has returned.

Placing a slightly tightened hose clamp around the servo to engine pipe to reduce its diameter & hence the power of the vacuum seems to stop the sinking completely & bakes feel less spongy. My question is could a fault with the servo cause a sinking pedal or would it ALWAYS make the pedal harder? Could the brakes be overboosted?
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post #8 of 8 (permalink) Old 20th June 2014
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Re: brake pedal sinks

Having vaguely similar braking problem. Spongy brakes after front disc/pad replacement and pressure bled 3 times incl cycling stuck ABS actuator on front n/s wheel (which is same wheel with a warped disc). Brakes firmed up after 2nd bleed with abs actuators switched but brakes went spongy after hard braking a week later.

Could try a breakers for abs unit around 90 I have been told.

Tried bleeding brakes today but could only bleed rear ones as front calipers have seized bleed screws. To top it off last garage changed gearbox oil and has been slowly leaking for a couple of weeks and found sump plug loose!
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brake , creeps , pedal , sinks

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