Checking and adjusting the brake pedal (Renault Sandero 1)

Correct position of the brake pedal when free and pressed all the way down (working stroke of the pedal) serves as one of the criteria for checking the serviceability of the brake system. At the same time, the position of the pedal largely ensures the proper operation of the system. If the pedal is located at a distance from the floor greater than the standard, incomplete release of the wheels is possible when the pedal is released (in this case, there is usually no free pedal travel). If the pedal is too low, there may be a reduction in braking effectiveness due to a reduction in pedal travel.

You will need: a ruler, pliers, a 13 mm wrench.



1. Press the brake pedal all the way down and measure the distance from the pedal pad to the floor.

Note: The ruler must be installed perpendicular to the floor plane.

2. Release the pedal and re-measure the distance from the pedal pad to the floor in a free state. This distance should be 100-105 mm. The difference in size in two measurements is the full working stroke of the pedal, which should be 60-65 mm.



3. If the distance from the pedal pad to the floor does not correspond to the intervals specified in item 2, adjust it by changing the length of the brake booster pushrod. Disconnect the pushrod fork from the brake pedal (see "Replacing the vacuum booster").





4. Loosen the fork lock nut B and, holding the push rod B from turning, rotate the fork A in the desired direction. One turn of the fork changes the position of the brake pedal by approximately 5 mm.

Note. For clarity, the work is shown on a removed vacuum booster. The manufacturer recommends removing the booster from the car to adjust the pedal position. However, with sufficient skills, the adjustment can be performed directly on the car.

5. Check the free travel of the brake pedal by moving the pedal by hand until the pedal stops moving without resistance. Use a ruler to determine the free travel, which should be 8-10 mm. If the free travel does not match the specified value, it may be due to the following reasons:

• increased play in the connection between the vacuum booster pusher fork and the pedal. This may be due to wear on the fork pin and holes in the fork and pedal;
• the distance from the pedal pad to the floor in the free state is incorrectly adjusted (see item 2, and also dimension L in Fig. 9.9);
• x size is not adjusted correctly (see fig. 9.9) between the end of the adjusting bolt of the brake booster rod and the flange of its housing for connecting the master brake cylinder.

6. If the pedal travel is greater than that specified in paragraph 2, this indicates the presence of air in the brake hydraulic drive or the brake shoe linings, brake discs or drums are at their maximum wear. Remove air from the hydraulic drive (see "Bleeding the hydraulic brake system") or replace the brake pads (see "Replacing the brake pads of the front wheel brake mechanism"; "Replacing the brake pads of the rear wheel brake mechanism"), disks (see "Replacing the brake disc") or drums (see "Removal and installation the brake drum").



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Warning: If the pedal is pressed all the way down and held in this position, it gradually moves towards the floor, this indicates a fluid leak from the hydraulic drive or a malfunction of the brake master cylinder. These malfunctions are very dangerous: immediately find the leak and fix it or replace the brake master cylinder!