Vacuum servo booster — overhaul (Peugeot 305)

1. The vacuum servo amplifier rarely breaks down. If it is heavily worn out as a result of long service, it is recommended to replace the servo amplifier assembly.

2. A faulty servo amplifier can be determined by the additional force required to apply the brakes. The servo amplifier must be checked by a specialist with the necessary equipment. The only thing you can do yourself is to replace the servo air filter (it is recommended to do this once every 2 years) and a one-way valve.

Replacing the air filter

3. When replacing the filter, the servo amplifier does not need to be removed. The air filter is located around the pushrod and is covered by a rubber boot on the rear wall of the servo amplifier.

4. Remove the clamp securing the pivot pin where the pushrod connects to the brake pedal. Remove the rubber boot and filter retainer. Remove the old filter using a suitable hook.

5. Since the new filter cannot pass through the end piece of the pusher, make a diagonal cut on the filter with a sharp knife so that you can turn back the edges of the cut and pass the filter through the pusher. Install the filter, its retainer and cover. Replace the pivot pin and secure it with a new clamp.

Replacing a one-way valve

6. Loosen the clamp and disconnect the vacuum hose from the one-way valve located on the front surface of the servo amplifier. After this, you can pull the valve out of the rubber sealing sleeve. It is advisable to replace the bushing with a new one, regardless of its condition, and if it is worn or cracked, replacement becomes mandatory. Install a new valve into the sleeve. To make installation easier, you can use brake fluid as a lubricant.

Original published on the portal (www.peugeotbook.ru)