Question about 2000 Renault 181

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No brakes after changing master cylinder and rear wheel cylinder it not the servo but i've tryed back bleeding without joy as there seems to be a blockage but not sure how as this should not happen in the front i have a renault espace 1996 2lt

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  • dean_price_4 Oct 01, 2009

    hank's for the advice but i've bleed them a number of times without any joy when i bleed the oil shows a little bit but there does not seem to have any pressure to push it down the tube also the car has had 3 other master cylinders on in the past year due to everyone thinking that was the fault but after the 4th one i think the other cylinders were not faulty it's somthing else not sure what it's also had 3 new wheel cylinders on in the past year aswell so i'm stumped anyway thanks once again and all the best

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Try pumping your brake pedal quickly at least 10 times, hold it to floor, get someone to open bleed nipple furthest from master cylinder then close again, let pedal up then repeat. Try loosening a pipe that leaves master cylinder, pump bake a few times to prime it, see if fluid comes out, the cylinder may be airlocked.

Posted on Sep 30, 2009

  • Strange Ian
    Strange Ian Oct 02, 2009

    You've tried slackening a brakepipe at point of entry into master cylinder & pumped brake pedal to see if fluid pumps out.?

    I once had problem where rear brakes would not bleed, only dribble when fully open, turned out to be an anti-lock compensator situated underneath vehicle, unit bolted to bodywork above rear axle area at end of front to rear pipe,where that the rear wheel brake pipes also went to, I thought it was just a junction box where the pipes split to rear wheels, it had a large nut on front of it, I dismantled this, inside was a plunger & spring with a rubber seal, I removed plunger, re-assembled & brakes bled fine. Only problem then was rear wheels locked up under heavy braking. I bought a new spring to fit on plunger & used a friends auto bleeder. A sealed bottle that has cap that screws onto top of master cylinder reservoir, a pipe then went from the bottle & clipped onto air valve of spare tyre, in effect the fluid was pressure fed into the master cylinder. A one man bleeding kit. Fluid expelled at rear cylinder when bleed nipple open, job was done, good brakes, wheels not longer locked at full braking pressure. Maybe you have similar on your braking system?

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If the master cylinder is replaced, care must be taken to prime the new master cylinder by removing all of the air and completely filling it with brake fluid. The spongy feeling is air that is still in the circuits. You will need to bleed the back brakes as well as the front ones again. The order that you bled them seems correct, but perhaps there remained some air in the main trunk lines.

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    How To: Bleed Your Brakes - Feature - Car and Driver

    www.caranddriver.com/.../how-to-bleed-your-brakes-feature Car and Driver
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How To: Bleed Your Brakes - Feature - Car and Driver

www.caranddriver.com > Features

Car and DriverIf there is a substantial fluid eruption, there are air bubbles still trapped in the system. You must repeat the bleeding procedure to remove that air. A modest disturbance in the fluid returning to the reservoir indicates a properly bled brake system.

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Hi, bleeding your rear brakes with engine running, you should get enough pressure out of the lines to squirt 3-4 feet. In other words, good pressure. If all you get is a trickle, you probably have a bad master cylinder. Just because its full of fluid, does not mean the seals arent shot. If you have bled them in order, left rear,right rear,left front,right fornt and have bled them enough to get fresh fluid out of each one without achieving good solid pressure at all wheels, replace your master cylinder. There is a proportioning valve, but usually it will affect only one wheel when going out, usually the left rear.
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Sorry to but in BUT

is this a high mileage car from what you discribe new Servo, Master Cylinder, Cylinders and rear brakes.????

Try the rear flexible brake pipe/s OLD RUBBER DELAMINATES well worth the swop. For the cost

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