MkIV Espace Spongy Brakes. - Renault Forums :: Independent Renault forum

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post #1 of 3 (permalink) Old 1st August 2009 Thread Starter
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MkIV Espace Spongy Brakes.

I wonder if someone could advise please. I have just changed the front pads on the wifes 53 plate 1.9Dci and now the brakes are spongy, I can't remember them being like this before I started. On tickover the brake pedal will steadily travel to the floor when pressed and a rush of what sounds like air can be heard from the front footwell area. The brakes will firm up if pumped and will stop the car. With the ignition turned off the brake pedal is solid when pressed and no rush of air can be heard. When I started, I forgot to slacken off the reservoir cap but the pistons pushed back into the calipers ok.

Have I damaged something or is there something else I need to do. Can't see any external fluid leaks anywhere.

Thank you.
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post #2 of 3 (permalink) Old 1st August 2009
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With vehicles fitted with ABS it is advisable to open the bleed nipple when retracting the piston plus removing the cap from the master cylinder. Forcing fluid the wrong way through the ABS control valves can cause them problems.
Is there a constant hiss from the footwell area or only when the brake is depressed.
With the engine switched off and the servo emptied you could try bleeding the brakes to see if it helps. I had a similar problem a few years back on a Honda - thankfully bleeding the brakes cured the problem.
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post #3 of 3 (permalink) Old 1st August 2009 Thread Starter
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The hissing sound is not continuous, only when you pump the brakes, once the brakes pump to the top of their travel it disappears. I got the wife to pump the brakes and I laid upside down in the footwell, the rush of air appeared to be coming from a rubber gaitor in the passenger footwell, it looks as if it must seal a pushrod that goes through the bulkhead to the servo, i.e when there is a lot of travel on the .brake pedal the pushrod overtravels and air is expelled from the inside of the gaitor but as the pedal stiffens up the pushrod travel is minimal and so less air is expelled from the gaitor.

Thanks for your speedy response, I will get the brother in-law to help me bleed the brakes, may even change the brake fluid.
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brakes , espace , mkiv , spongy

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