Genuine Volvo V70 Brake Booster

Volvo V70 Brake Booster Parts and Q&A

• Brake Booster
  30793673
  Q: How to remove the Brake Booster servo unit on Volvo V70?

  A:

  To remove the brake booster, first disconnect the battery negative lead and depress the brake pedal several times to dissipate any vacuum in the brake booster. Next, undo the fasteners and remove the engine cross-stay from between the suspension turrets. Disconnect any wiring connectors from the reservoir, master cylinder, and brake booster, noting their fitted positions. Remove the nuts securing the master cylinder to the brake booster, taking care not to damage the rigid brake pipes, and discard the O-ring seal, ensuring the master cylinder remains horizontal to prevent air from entering the system. Disconnect the brake booster vacuum feed by levering out the non-return valve, then release the wiring loom and ducting around the brake booster for improved access. Remove the trim panel under the facia on the driver's side by pulling it rearwards, then disconnect the brake booster pushrod and linkage from the brake pedal by removing the retaining clip. Undo the four nuts securing the brake booster to the bulkhead, and to remove the brake booster, lower the front subframe and engine/transmission slightly by jacking up the front of the vehicle and supporting it securely on axle stands. Undo the bolts securing the cable ducting to the front underside of the subframe and the screws securing the three crossmembers under the exhaust system. With the steering in the straight-ahead position and the steering lock engaged, undo the pinch-bolt and pull the lower steering column universal joint from the steering rack pinion. For models with an auxiliary fuel-fired heater, undo the heater mounting nuts and release the heater fuel lines from the retaining brackets on the subframe, suspending the heater from the bodywork. On turbocharged engines, release the clamps and remove the charge air pipes to and from the intercooler. Position a mobile jack under the front subframe, support it, and remove the subframe mounting bolts one at a time, substituting each with a length of studded rod with washers and locknuts fitted. Undo the four bolts securing the brackets at the rear of the subframe, then gradually lower the subframe from the front until there is sufficient clearance to maneuver the brake booster from the engine compartment, recovering the seal between the brake booster and the bulkhead. For refitting, ensure the seal is in position before fitting the brake booster, tighten all nuts and bolts to the specified torque, refit the master cylinder, and check and bleed the hydraulic system if necessary.