Renault Coupes/Sedans/Wagons 1975-1985 Repair Guide

Bleeding Brake System

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Fig. Fig. 1 Bleed the rear brakes using a hose attached to the bleeder and submerged in a bottle of brake fluid



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Fig. Fig. 2 Bleed the air from the front brakes using the same hose and bottle setup as used on the rear



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Fig. Fig. 3 Some master cylinders also have a bleed valve-bleed the master cylinder last

Whenever the brake hydraulic system is opened, air is allowed in. This air must be expelled. Unless you have a one-person bleeder, which is available at some auto parts stores, a helper will be needed. The two-person system is the one described here.

  1. Have your assistant sit in the driver's seat.
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  3. You procede to the right rear wheel and remove the tire.
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  5. Attach a length of hose to the bleeder screw nipple and submerge the other end in a jar half full of clean brake fluid. The bleeder screw protrudes from the backing plate and is actually part of the wheel cylinder. It is located at the top.
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  7. Make sure that the master cylinder is full.
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  9. Place a wrench on the bleeder screw. Do not open it yet. Have your helper pump the brake pedal five or six times and hold it down as far as possible. At this point, open the bleeder screw and observe the jar. A rush of fluid will enter the jar. If air bubbles are present, you just expelled air from the system. Close the bleeder screw. THEN, tell your assistant to let up on the pedal. NEVER ALLOW THE PEDAL UP WHILE THE BLEEDER SCREW IS OPEN. Do this a couple more times, or until no bubbles are observed entering the jar. Check the master cylinder level frequently.
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  11. Do, in turn, the left front, left rear and right front. If you did a good job, the pedal action should be firm, not spongy. If a good bleeding job does not result in a firm pedal, then you've got problems. Check all components in the system for leaks.
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