GM Corsica/Beretta 1988-1996 Repair Guide

Power Brake Booster



See Figure 1

It is not necessary to remove or disconnect the master cylinder from the vehicle in order to remove the vacuum booster. However, if both the vacuum booster and master cylinder are to be removed, remove the master cylinder first as described earlier.

  1. Remove the brake master cylinder, as outlined earlier in this section. Move the master cylinder forward just enough to clear the studs on the vacuum booster. This will flex the pipes slightly. Be careful not to bend or distort the brake pipes.

Place the master cylinder in an upright position to prevent fluid loss.

  1. It may be necessary on some models to remove the left lower trim panel inside the vehicle, then disconnect the brake pedal-to-booster push rod from the brake pedal.
  3. Disconnect the vacuum line from the booster.
  5. Unfasten the brake booster mounting nuts, then remove the booster from the firewall.

Click image to see an enlarged view

Fig. Fig. 1: Exploded view of a typical power brake booster mounting

To install:
  1. To install, reverse the removal procedures.

When installing the push rod to the brake pedal, tilt the entire vacuum booster push rod onto the clevis pin without putting undue side pressure on the push rod.

  1. Tighten the master cylinder-to-power booster to 20 ft. lbs. (28 Nm) and the power booster mounting nuts to 20 ft. lbs. (28 Nm).
  3. Properly bleed the brake system.