Description
BOSCH Brake Booster For Stellantis Vehicles. Removed From A Vehicle With 33,000 Km.
This used BOSCH brake booster (power brake servo) is a direct-fit spare part commonly used on Citroën and Peugeot models from the Stellantis group. Ideal for professional workshops and DIY mechanics who search by OE number (9821104980, 1635255280, 0204J00547). The unit restores proper brake pedal feel and vacuum assist, reducing stopping distances and pedal effort when installed together with a correctly functioning master cylinder and vacuum supply.
Application And Compatibility
Fits vehicles including Citroën Berlingo III, Peugeot Partner III, Peugeot Rifter, Opel Combo E (K9) and Fiat Doblo III where the listed OE references are used. Always confirm fitment by matching the product codes stamped on the part with the vehicle’s parts list.
Technical Information
- Manufacturer: BOSCH
- Model: Citroën Berlingo III / Peugeot Partner III / Peugeot Rifter / Opel Combo E K9 / Fiat Doblo III
- Product Codes: 9821104980, 1635255280, 0204J00547
- Additional Numbers: No Additional Numbers Provided
Function And How It Works
The brake booster multiplies the force applied by the driver on the brake pedal using engine vacuum (or an electric pump on some systems). It sits between the brake pedal and the master cylinder and ensures a firm, predictable pedal with less driver effort. If the booster loses vacuum or the internal diaphragm is damaged, pedal travel increases and braking effectiveness is reduced.
Typical Causes Of Failure
- Diaphragm rupture or internal vacuum loss causing reduced assistance.
- Failed vacuum check valve or damaged vacuum hose leading to insufficient vacuum supply.
- Master cylinder leaks allowing brake fluid to enter and contaminate the booster.
- Corrosion or mechanical wear on mounting points and pushrod components over time.
Mounting Recommendation
Replacement should be performed by a qualified technician or a competent DIY mechanic with brake experience. Follow these general steps and safety precautions:
- Park the vehicle on a level surface and secure it. Wear protective equipment.
- Depressurize the brake system by pressing the brake pedal several times with the engine off.
- Support the master cylinder to avoid stressing or disconnecting hydraulic lines unnecessarily; if lines must be opened, be prepared to capture and properly dispose of brake fluid.
- Disconnect the vacuum hose and check valve from the booster and inspect hoses for damage—replace if necessary.
- Remove the booster mounting nuts at the bulkhead/firewall and disconnect the pushrod from the brake pedal.
- Install the replacement booster in reverse order. Ensure pushrod alignment and correct engagement with the pedal linkage.
- Reconnect vacuum supply and any electrical connectors. If the vehicle uses an electric vacuum pump, verify proper operation.
- Bleed the brake system according to the manufacturer’s procedure to remove air and restore pedal firmness.
- Perform a functional check: with the engine running, verify pedal travel and vacuum assist; check for leaks and proper pedal feel before road testing.
Do not exceed manufacturer torque specifications for fasteners—refer to the vehicle workshop manual for exact values.
Why Replace Other Components At The Same Time
- Vacuum Check Valve And Hoses: Frequently deteriorate and compromise booster performance.
- Master Cylinder: If leaking or contaminated, it can damage a new booster quickly.
- Brake Fluid: Old or contaminated fluid should be replaced when the hydraulic circuit is opened.
Notes For Buyers
This unit was removed from a vehicle with 33,000 km and is offered as a used spare part. Customers commonly search using the OE numbers 9821104980, 1635255280 or 0204J00547—including these references in your search will improve match rates. Suitable for professional installers and experienced DIY mechanics familiar with brake-system servicing.
Reason For Purchase
Choose this brake booster to restore proper brake assist and pedal feel on compatible Stellantis vehicles, reduce pedal effort, and maintain safe braking performance when the original booster has failed or leaks.
Installation Tips
- Inspect the master cylinder and vacuum supply before installation to avoid premature failure of the replacement booster.
- Replace vacuum hoses and check valve if they are hardened, cracked, or show signs of wear.
- After installation, bleed brakes carefully and verify pedal firmness at rest and while driving at low speed in a safe area.
